JP4586423B2 - Method for producing electroplated steel sheet - Google Patents

Method for producing electroplated steel sheet Download PDF

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JP4586423B2
JP4586423B2 JP2004166718A JP2004166718A JP4586423B2 JP 4586423 B2 JP4586423 B2 JP 4586423B2 JP 2004166718 A JP2004166718 A JP 2004166718A JP 2004166718 A JP2004166718 A JP 2004166718A JP 4586423 B2 JP4586423 B2 JP 4586423B2
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plating solution
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steel plate
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賢 福島
容任 森川
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JFE Steel Corp
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本発明は、めっき液噴流を用いて鋼板に電気めっきを連続的に行う電気めっき鋼板の製造方法に関する。 The present invention relates to the production how electroplating steel sheet is carried out continuously electroplated steel sheet using a plating solution jet.

従来、水平または垂直方向に走行する鋼板を連続的にめっきを行う方法として、鋼板の両面側に鋼板を挟むように各々相対して電極を配置し、鋼板の進行方向に対向する方向でノズルヘッダよりめっき液を噴射し、鋼板と電極間に強制対流を形成する方法が行われている。   Conventionally, as a method of continuously plating a steel plate traveling in a horizontal or vertical direction, electrodes are arranged opposite to each other so as to sandwich the steel plate on both sides of the steel plate, and the nozzle header is arranged in a direction opposite to the traveling direction of the steel plate. A method of forming a forced convection between a steel plate and an electrode by spraying a plating solution more.

連続電気めっきラインにおいて、高能率・高生産性を達成するためにはラインスピードの高速化が必要であり、そのためには低電圧操業が可能でありかつ高電流密度による高速電析をいかに達成するかが基本的な考え方である。   In order to achieve high efficiency and high productivity in a continuous electroplating line, it is necessary to increase the line speed. To that end, low voltage operation is possible and high-speed electrodeposition with high current density is achieved. Is the basic concept.

低電圧操業を可能にするためには、めっき液抵抗およびめっき時に発生する気泡溜りによる電圧アップを解消する必要がある。その対策として電極と鋼板間の距離を縮めることが最も有効であるが、鋼板のＣ反り等の形状や振動が阻害要因となる。対向型噴流めっきでは、鋼板の形状矯正、振動抑制の機構がないため、電極と鋼板間の近接化には限界があった。   In order to enable low voltage operation, it is necessary to eliminate the increase in voltage due to the resistance of the plating solution and the accumulation of bubbles generated during plating. As a countermeasure against this, it is most effective to reduce the distance between the electrode and the steel plate, but the shape and vibration such as C warpage of the steel plate are obstructive factors. In counter-type jet plating, since there is no mechanism for correcting the shape of the steel sheet and suppressing vibration, there is a limit to the proximity between the electrode and the steel sheet.

また、高電流密度でめっき処理を行うと、ある値を閾値としてそれ以上の電流密度では金属光沢のある正常なめっきが得られず、黒味を帯びためっきとなる。これはめっきヤケと呼ばれる品質不良であり、例えば亜鉛めっきでは、鋼板へのＺｎイオンの供給速度がめっきの電析速度に追従しきれないために生ずる。よって、高電流密度電析を達成するためには、Ｚｎイオンを鋼板へ効率的に供給することが必須となる。そのためには、強制対流を利用すればよく、電極と鋼板間の距離を縮め、めっき液の流速を大きくすることが有効である。   Further, when plating is performed at a high current density, normal plating with metallic luster cannot be obtained at a current density higher than a certain value as a threshold value, resulting in blackish plating. This is a poor quality called plating burn. For example, in galvanization, the supply rate of Zn ions to the steel sheet cannot follow the electrodeposition rate of plating. Therefore, in order to achieve high current density electrodeposition, it is essential to efficiently supply Zn ions to the steel sheet. For that purpose, forced convection may be used, and it is effective to reduce the distance between the electrode and the steel sheet and increase the flow rate of the plating solution.

特許文献１等にめっきセル内で鋼板を安定的に保持する手段方法が開示されている。特許文献１では、電極中央部に上下対称に配置させたスリットノズルよりめっき液を鋼板に対して噴流し、静圧流体支持により鋼板のＣ反りを矯正するとともに、鋼板の安定支持により、鋼板と電極間を近接化させる方法が記載されている。
特公昭６１−２１３１９号公報 Patent Document 1 discloses a means for stably holding a steel plate in a plating cell. In Patent Document 1, a plating solution is jetted onto a steel plate from a slit nozzle arranged vertically symmetrically at the center of the electrode, and C-warp of the steel plate is corrected by static pressure fluid support. A method for bringing electrodes close to each other is described.
Japanese Examined Patent Publication No. 61-21319

特許文献１に記載されている方法は、電極の中央部で鋼板に対して垂直に噴流させることにより、Ｃ反り及び振動をある程度低減することが可能であるが、この方法ではコンダクターロール間、あるいはダムロール間に節を作ることによって、Ｃ反り、及び振動を低減することになるため、Ｃ反り及び振動の低減量には限界がある。   In the method described in Patent Document 1, it is possible to reduce C warpage and vibration to some extent by jetting perpendicularly to the steel sheet at the center of the electrode, but in this method, between the conductor rolls or By making a node between the dam rolls, C warpage and vibration are reduced, so there is a limit to the amount of reduction of C warpage and vibration.

また、鋼板と平行にめっき液が流れる部分の多いめっきセルの場合、電極長さの増加と共に、鋼板近傍のめっき液の速度境界層および濃度境界層が発達する。境界層内はめっき液の流れが少ないため、Ｚｎイオンの供給が鈍り、高電流密度めっき処理の場合、電析により消費されるＺｎイオンに比べ、めっき液噴流から供給されるＺｎイオンの量が少ないため、めっきヤケが生じやすくなる。さらに、静圧流体支持を行うと、鋼板と電極間でめっき液の流動状態が悪くなり、めっき時に発生する気泡が鋼板〜電極間に貯まりやすくなり、低電圧操業の妨げとなる。   Further, in the case of a plating cell having many portions where the plating solution flows in parallel with the steel plate, the velocity boundary layer and the concentration boundary layer of the plating solution in the vicinity of the steel plate develop as the electrode length increases. In the boundary layer, since the flow of the plating solution is small, the supply of Zn ions is slow, and in the case of high current density plating, the amount of Zn ions supplied from the plating solution jet is smaller than the Zn ions consumed by electrodeposition. Since there are few, it becomes easy to produce a plating burn. Furthermore, when the hydrostatic fluid support is performed, the flow state of the plating solution is deteriorated between the steel plate and the electrode, and bubbles generated during plating are easily accumulated between the steel plate and the electrode, which hinders low voltage operation.

本発明は、前記課題を解決し、めっきセル内でＺｎイオンなどの供給を効率的に行い、めっき時に発生する気泡の逃げをスムーズに行うことにより、低電圧操業および／または高電流密度めっきが可能となる電気めっき鋼板の製造方法を提供することを目的とする。   The present invention solves the above problems, efficiently supplies Zn ions and the like in the plating cell, and smoothly discharges bubbles generated during plating, thereby enabling low voltage operation and / or high current density plating. It aims at providing the manufacturing method of the electroplating steel plate which becomes possible.

また、本発明は、めっきセル内でのＣ反りを抑制しまた振動を低減することで、鋼板と電極間距離を狭めて、低電圧操業および／または高電流密度めっきが可能となる電気めっき鋼板の製造方法を提供することを目的とする。   The present invention also provides an electroplated steel sheet that can suppress low-voltage operation and / or high current density plating by reducing the distance between the steel sheet and the electrode by suppressing C warpage and reducing vibration in the plating cell. It aims at providing the manufacturing method of.

上記課題を解決する本発明の手段は次のとおりである。   Means of the present invention for solving the above-mentioned problems are as follows.

第１発明は、連続的に走行する鋼板の両面側に鋼板を挟むように各々相対して配置した電極と、前記鋼板に通電するコンダクターロールと、前記鋼板の両面側に各々配置されて鋼板面にめっき液を噴射するためのノズルヘッダを有しためっき装置を用いて電気めっき鋼板を製造する方法において、
複数のめっき液噴出口を設けたノズルヘッダを電極の背面に前記電極と間隔をあけて配置するとともに、前記電極の前記ノズルヘッダの各めっき液噴出口に対応する位置に、前記ノズルヘッダからのめっき液を鋼板−電極間に案内するための貫通孔を前記電極を貫通して設け、前記ノズルヘッダの前記複数のめっき液噴出口からめっき液を噴射して鋼板に対してほぼ垂直方向に衝突させてめっきするとともに、前記ノズルヘッダを鋼板の走行方向に対して少なくとも３区画以上に分割し、鋼板の上下面の対向する区画のノズルヘッダの噴出圧力を異なるようにするとともに、鋼板の上下面の対向する区画のノズルヘッダの噴出圧力の大小関係を上流側から下流側にかけて順次逆転させることを特徴とする電気めっき鋼板の製造方法である。 1st invention is the steel plate surface which is each arrange | positioned on the both surfaces of the said steel plate, the electrode arrange | positioned facing each other so that a steel plate may be pinched | interposed on both surfaces of the steel plate which runs continuously, respectively In a method of manufacturing an electroplated steel sheet using a plating apparatus having a nozzle header for spraying a plating solution on
A nozzle header provided with a plurality of plating solution spouts is disposed on the back surface of the electrode at a distance from the electrode, and at a position corresponding to each plating solution spout of the nozzle header of the electrode, from the nozzle header A through hole for guiding the plating solution between the steel plate and the electrode is provided through the electrode, and the plating solution is injected from the plurality of plating solution outlets of the nozzle header to collide with the steel plate in a substantially vertical direction. And the nozzle header is divided into at least three sections with respect to the traveling direction of the steel sheet so that the jetting pressures of the nozzle headers in the opposing sections of the steel sheet are different, and the upper and lower surfaces of the steel sheet This is a method for producing an electroplated steel sheet, wherein the magnitude relationship of the ejection pressure of the nozzle headers in the opposite sections is sequentially reversed from the upstream side to the downstream side .

第２発明は、連続的に走行する鋼板の両面側に鋼板を挟むように各々相対して配置した電極と、前記鋼板に通電するコンダクターロールと、前記鋼板の両面側に各々配置されて鋼板面にめっき液を噴射するためのノズルヘッダを有しためっき装置を用いて電気めっき鋼板を製造する方法において、
前記ノズルヘッダを前記電極の背面に前記電極と間隔をあけて配置し、前記ノズルヘッダに前記ノズルヘッダから突出して形成した複数のめっき液噴出管を設けるとともに、前記電極の前記ノズルヘッダの各めっき液噴出管に対応する位置に、前記ノズルヘッダからのめっき液を鋼板−電極間に案内するための貫通孔を前記電極を貫通して設け、前記ノズルヘッダの前記複数のめっき液噴出管からめっき液を噴射して鋼板に対してほぼ垂直方向に衝突させてめっきするとともに、前記ノズルヘッダを鋼板の走行方向に対して少なくとも３区画以上に分割し、鋼板の上下面の対向する区画のノズルヘッダの噴出圧力を異なるようにするとともに、鋼板の上下面の対向する区画のノズルヘッダの噴出圧力の大小関係を上流側から下流側にかけて順次逆転させることを特徴とする電気めっき鋼板の製造方法である。 According to a second aspect of the present invention, there are provided electrodes disposed opposite to each other so as to sandwich the steel plate between both sides of the continuously running steel plate, a conductor roll for energizing the steel plate, and a steel plate surface respectively disposed on both sides of the steel plate. In a method of manufacturing an electroplated steel sheet using a plating apparatus having a nozzle header for spraying a plating solution on
The nozzle header is disposed on the back surface of the electrode with a gap from the electrode, and a plurality of plating solution ejection pipes formed to protrude from the nozzle header are provided on the nozzle header, and each plating of the nozzle header of the electrode is provided. A through hole for guiding the plating solution from the nozzle header between the steel plate and the electrode is provided through the electrode at a position corresponding to the liquid ejection tube, and plating is performed from the plurality of plating solution ejection tubes of the nozzle header. The nozzle header is divided into at least three sections or more with respect to the traveling direction of the steel sheet, and the nozzle headers in the opposing sections of the upper and lower surfaces of the steel sheet The ejection pressures of the nozzle headers in the opposing sections of the upper and lower surfaces of the steel plate are changed in order from the upstream side to the downstream side. A method of manufacturing an electro-plated steel sheet, characterized in that to reverse.

第３発明は、第２発明において、前記めっき液噴出管の外法は、前記貫通孔の内法より小さく、かつ、鋼板と電極間距離をａ、電極厚さをｂとしたときに、前記めっき液噴出管先端と鋼板との距離Ｈは、下式を満足することを特徴とする電気めっき鋼板の製造方法である。
ｂ≦４ａ／３の場合、ａ−ｂ／２≦Ｈ≦ａ＋３ｂ／２
ｂ＞４ａ／３の場合、ａ／３≦Ｈ≦ａ＋３ｂ／２
第４発明は、第１〜第３発明において、前記各貫通孔同士の間に、電極を貫通するめっき液排出孔を設けて、鋼板−電極間に噴射されためっき液を前記めっき液排出孔から排出することを特徴とする電気めっき鋼板の製造方法である。 According to a third invention, in the second invention, the outer method of the plating solution ejection pipe is smaller than the inner method of the through hole, and when the distance between the steel plate and the electrode is a and the electrode thickness is b, The distance H between the tip of the plating solution ejection pipe and the steel sheet satisfies the following formula, and is a method for producing an electroplated steel sheet.
In the case of b ≦ 4a / 3, a−b / 2 ≦ H ≦ a + 3b / 2
When b> 4a / 3, a / 3 ≦ H ≦ a + 3b / 2
According to a fourth aspect of the present invention, in the first to third aspects of the present invention, a plating solution discharge hole penetrating the electrode is provided between the through holes, and the plating solution sprayed between the steel plate and the electrode is supplied to the plating solution discharge hole. It is the manufacturing method of the electroplated steel plate characterized by the above-mentioned.

第５発明は、連続的に走行する鋼板の両面側に鋼板を挟むように各々相対して配置した電極と、前記鋼板に通電するコンダクターロールと、前記鋼板の両面側に各々配置されて鋼板面にめっき液を噴射するためのノズルヘッダを有しためっき装置を用いて電気めっき鋼板を製造する方法において、
前記ノズルヘッダを前記電極の背面に前記電極に接するように配置するとともに、前記電極に該電極を貫通する複数の貫通孔を設けて、前記複数の貫通孔からめっき液を噴射して鋼板に対してほぼ垂直方向に衝突させてめっきするとともに、前記貫通孔同士の間に、電極を貫通するめっき液排出孔を設けて、鋼板−電極間に噴射されためっき液を前記めっき液排出孔から排出するとともに、前記ノズルヘッダを鋼板の走行方向に対して少なくとも３区画以上に分割し、鋼板の上下面の対向する区画のノズルヘッダの噴出圧力を異なるようにするとともに、鋼板の上下面の対向する区画のノズルヘッダの噴出圧力の大小関係を上流側から下流側にかけて順次逆転させることを特徴とする電気めっき鋼板の製造方法である。 5th invention is the steel plate surface each arrange | positioned on the both surfaces side of the said steel plate, the electrode arrange | positioned facing each other so that a steel plate may be pinched | interposed on both surfaces of the steel plate which carries out continuous, the said steel plate, respectively In a method of manufacturing an electroplated steel sheet using a plating apparatus having a nozzle header for spraying a plating solution on
The nozzle header is disposed on the back surface of the electrode so as to be in contact with the electrode, and the electrode is provided with a plurality of through holes penetrating the electrode, and a plating solution is sprayed from the plurality of through holes to the steel plate. The plating solution is made to collide in a substantially vertical direction, and a plating solution discharge hole penetrating the electrode is provided between the through holes, and the plating solution sprayed between the steel plate and the electrode is discharged from the plating solution discharge hole. In addition, the nozzle header is divided into at least three sections with respect to the traveling direction of the steel sheet so that the jetting pressures of the nozzle headers in the facing sections of the upper and lower surfaces of the steel sheet are different, and the upper and lower surfaces of the steel sheet face each other. A method for producing an electroplated steel sheet, wherein the magnitude relationship of the ejection pressure of the nozzle header of the compartment is sequentially reversed from the upstream side to the downstream side .

第６発明は、第１〜第５発明において、めっき液噴出口同士の間隔またはめっき液噴出管同士の間隔（第５発明は貫通孔同士の間隔）：Ｌd、めっき液噴出口先端と鋼板との距離またはめっき液噴出管先端と鋼板との距離（第５発明は貫通孔の鋼板側端部と鋼板との距離）：Ｈ、めっき液噴出口の内径またはめっき液噴出管の内径（第５発明は貫通孔の内径）：ｄは、１≦Ｌd／Ｈ≦１０、且つ、１≦Ｈ／ｄ≦１５を満足することを特徴とする電気めっき鋼板の製造方法である。 A sixth invention is the first to fifth inventions, wherein the plating solution outlets or the plating solution outlets are spaced apart (the fifth invention is the interval between the through holes): L d , the plating solution outlet tip and the steel plate Or the distance between the tip of the plating solution jet pipe and the steel plate (the fifth invention is the distance between the steel plate side end of the through hole and the steel plate): H, the inner diameter of the plating solution outlet or the inner diameter of the plating solution jet pipe (first 5 is an inner diameter of the through-hole): d is a method for producing an electroplated steel sheet, wherein 1 ≦ L d / H ≦ 10 and 1 ≦ H / d ≦ 15 are satisfied.

第７発明は、連続的に走行する鋼板の両面側に鋼板を挟むように各々相対して配置した電極と、前記鋼板に通電するコンダクターロールと、前記鋼板の両面側に各々配置されて鋼板にめっき液を噴射するノズルヘッダを有しためっき装置を用いて電気めっき鋼板を製造する方法において、
前記ノズルヘッダを鋼板の走行方向に対して少なくとも３区画以上に分割し、鋼板の上下面の対向する区画のノズルヘッダの噴出圧力を異なるようにするとともに、鋼板の上下面の対向する区画のノズルヘッダの噴出圧力の大小関係を上流側から下流側にかけて順次逆転させてめっき液を噴射してめっきすることを特徴とする電気めっき鋼板の製造方法である。 7th invention is the steel plate which is each arrange | positioned on the both surfaces side of the said steel plate, the electrode arrange | positioned facing each other so that a steel plate may be pinched | interposed on both surfaces of the steel plate which runs continuously, the said steel plate, respectively In a method for producing an electroplated steel sheet using a plating apparatus having a nozzle header for spraying a plating solution,
Divided into at least three compartments or the nozzle header to the running direction of the steel sheet, as well as to different ejection nozzle pressure header opposing sections of the upper and lower surfaces of the steel sheet, the compartment facing the upper and lower surfaces of the steel plate nozzle A method of manufacturing an electroplated steel sheet, wherein plating is performed by sequentially reversing the magnitude of the jetting pressure of the header from the upstream side to the downstream side and spraying a plating solution.

第８発明は、第７発明において、前記ノズルヘッダを前記電極の背面に前記電極と間隔をあけて配置するとともに、前記ノズルヘッダの各々の区画にめっき液噴出用開口部を設け、前記電極は、前記ノズルヘッダの前記各めっき液噴出用開口部に対応する位置に前記ノズルヘッダからのめっき液を鋼板−電極間に案内するための電極を貫通する開口部を設け、前記ノズルヘッダの前記めっき液噴出用開口部からめっき液を噴射して鋼板に対してほぼ垂直方向に衝突させることを特徴とする電気めっき鋼板の製造方法である。 According to an eighth invention, in the seventh invention, the nozzle header is disposed on the back surface of the electrode with a gap from the electrode, and an opening for plating solution ejection is provided in each section of the nozzle header. An opening penetrating an electrode for guiding the plating solution from the nozzle header between a steel sheet and an electrode is provided at a position corresponding to each of the plating solution ejection openings of the nozzle header, and the plating of the nozzle header A method for producing an electroplated steel sheet, characterized in that a plating solution is sprayed from a liquid jetting opening so as to collide with the steel sheet in a substantially vertical direction.

第９発明は、第７発明において、前記ノズルヘッダを前記電極の背面に前記電極と間隔をあけて配置するとともに、前記ノズルヘッダの各々の区画に前記ノズルヘッダから突出して形成しためっき液噴出用開口部を設け、前記電極は、前記ノズルヘッダの前記各めっき液噴出用開口部に対応する位置に前記ノズルヘッダからのめっき液を鋼板−電極間に案内するための電極を貫通する開口部を設け、前記ノズルヘッダからめっき液を噴射して鋼板に対してほぼ垂直方向に衝突させることを特徴とする電気めっき鋼板の製造方法である。 A ninth aspect of the invention relates to the plating solution jet according to the seventh aspect of the invention, wherein the nozzle header is disposed on the back surface of the electrode with a gap from the electrode, and is formed in each section of the nozzle header so as to protrude from the nozzle header. An opening is provided, and the electrode has an opening penetrating the electrode for guiding the plating solution from the nozzle header between the steel plate and the electrode at a position corresponding to each of the plating solution ejection openings of the nozzle header. It is a method for producing an electroplated steel sheet, characterized in that a plating solution is sprayed from the nozzle header to collide with the steel sheet in a substantially vertical direction.

第１０発明は、第７発明において、前記ノズルヘッダを前記電極の背面に前記電極に接するように配置するとともに、前記ノズルヘッダの各々の区画に対応する電極部分に該電極を貫通する開口部を設けて、前記開口部からめっき液を噴射して鋼板に対してほぼ垂直方向に衝突させることを特徴とする電気めっき鋼板の製造方法である。 A tenth invention is the seventh invention, wherein the nozzle header is disposed on the back surface of the electrode so as to contact the electrode, and an opening that penetrates the electrode is formed in an electrode portion corresponding to each section of the nozzle header. It is a method for producing an electroplated steel sheet, characterized in that a plating solution is sprayed from the opening and collides with the steel sheet in a substantially vertical direction.

第１１発明は、第８〜第１０発明において、前記電極の開口部及び前記ノズルヘッダのめっき液噴出口はいずれもスリット形状であることを特徴とする電気めっき鋼板の製造方法である。 An eleventh invention is the method for producing an electroplated steel sheet according to any one of the eighth to tenth inventions, wherein each of the opening of the electrode and the plating liquid outlet of the nozzle header has a slit shape.

第１２発明は、鋼板の走行方向に複数の電極が配置されためっき装置を用いて電気めっき鋼板を製造するに当たり、少なくとも１の電極において第１〜第１１発明に記載の方法でめっきすることを特徴とする電気めっき鋼板の製造方法である。 In the twelfth invention, in producing an electroplated steel sheet using a plating apparatus in which a plurality of electrodes are arranged in the traveling direction of the steel sheet, the plating according to the first to eleventh inventions is performed on at least one electrode. It is the manufacturing method of the electroplated steel plate characterized.

第１３発明は、第１〜第１２発明において、連続的に走行する鋼板の両面側に鋼板を挟むように各々相対して配置した電極と、前記鋼板に通電するコンダクターロールと、前記鋼板の両面側に各々配置されて鋼板面にめっき液を噴射するためのノズルヘッダを有しためっき装置を備える製造ライン中に鋼板のめっき付着量を計測する付着量計を配置し、この付着量計により測定した幅方向のめっき付着量に応じて、鋼板の上下面の対向するノズルヘッダからのめっき液の噴出圧力差を変更し、鋼板幅方向のめっき付着量分布を調整することを特徴とする電気めっき鋼板の製造方法である。 A thirteenth invention is the first to twelfth inventions, in the first to twelfth inventions, electrodes disposed opposite to each other so as to sandwich the steel plate between both sides of the continuously running steel plate, a conductor roll for energizing the steel plate, and both surfaces of the steel plate An adhesion meter that measures the amount of plating on the steel sheet is placed in a production line equipped with a plating machine that has a nozzle header for spraying the plating solution onto the steel sheet surface. In accordance with the applied amount of plating in the width direction, the electroplating is characterized in that the plating pressure distribution difference in the steel plate width direction is adjusted by changing the jetting pressure difference of the plating solution from the nozzle header facing the upper and lower surfaces of the steel plate. It is a manufacturing method of a steel plate.

本発明によれば、めっきセル内でのめっきイオンの供給を効率的に行うことが可能になり、またはさらにめっき時に発生する気泡の逃げをスムーズに行うことが可能になり、その結果、低電圧操業および／または高電流密度めっきが可能となる。   According to the present invention, it is possible to efficiently supply plating ions in the plating cell, or it is possible to smoothly escape air bubbles generated during plating, resulting in a low voltage. Operation and / or high current density plating are possible.

また、本発明によれば、めっきセル内の鋼板を連続的に微小にわん曲させることでＣ反りを抑制し、また振動を低減して、鋼板と電極間距離を狭めることが可能になり、その結果、低電圧操業および／または高電流密度めっきが可能となる。   Moreover, according to the present invention, it is possible to suppress the C warpage by continuously bending the steel plate in the plating cell minutely, reduce the vibration, and narrow the distance between the steel plate and the electrode, As a result, low voltage operation and / or high current density plating are possible.

本発明によれば、前記の結果から、電気めっき鋼板を製造する際に高能率、高生産性を実現できる。   According to the present invention, from the above results, high efficiency and high productivity can be realized when manufacturing an electroplated steel sheet.

本発明者等は、電気亜鉛めっきにおけるＺｎイオンの供給不足、およびめっき時に発生する気泡に起因するめっき効率の低下を防止すべく、種々の調査、検討を行った。その結果、対向噴流型のめっきセルの場合、電極長さと供に鋼板近傍に速度境界層および濃度境界層が発達し、Ｚｎイオンの供給が低下して限界電流密度が低下するだけでなく、境界層内に気泡が溜り易く抵抗電圧が上昇することが明らかとなった。   The present inventors conducted various investigations and examinations in order to prevent insufficient supply of Zn ions in electrogalvanizing and a decrease in plating efficiency due to bubbles generated during plating. As a result, in the case of the counter-jet type plating cell, not only the velocity boundary layer and the concentration boundary layer develop in the vicinity of the steel plate together with the electrode length, the supply of Zn ions decreases and the limiting current density decreases, but also the boundary It was found that bubbles easily accumulate in the layer and the resistance voltage increases.

そして、高能率・高生産性電気めっき達成のためには、速度境界層および濃度境界層の発達を抑えることが必要であり、そのためには、鋼板を挟むようにめっき液供給用の多孔ノズルおよび前記多孔ノズルの孔位置に対応する位置に多孔を設けた電極を配置し、この孔部からめっき液を鋼板へ噴射することが有効であることを見出した。   In order to achieve high efficiency and high productivity electroplating, it is necessary to suppress the development of the velocity boundary layer and the concentration boundary layer. It has been found that it is effective to dispose an electrode having a hole at a position corresponding to the hole position of the porous nozzle and to spray the plating solution from the hole to the steel plate.

また、めっきセル内で鋼板にＬ反りを２箇所以上付与することで、Ｃ反りが矯正され、さらに振動も低減されることを見出した。   Moreover, it discovered that C curvature was corrected and vibration was also reduced by giving two or more L curvature to a steel plate within a plating cell.

本発明はこれらの知見に基づくものである。以下、本発明について詳しく説明する。なお、以下の説明では、めっきは亜鉛めっきを念頭において説明する。また、以下の図において、説明済みの図に示された部分と同じ作用の部分には同じ符号を付してその説明を省略する。   The present invention is based on these findings. The present invention will be described in detail below. In the following description, plating will be described with galvanization in mind. Further, in the following drawings, the same reference numerals are given to portions having the same functions as the portions shown in the already described drawings, and the description thereof is omitted.

図１は、本発明の実施の形態に係るめっき装置の第１の実施形態の要部構成例を示す概略断面図である。本装置では、連続的に水平に走行する鋼板１に対して、鋼板１両面を挟むように電極７、７が配置され、電極７の上流側、下流側に各々めっき液４を堰き止めるダムロール５、前記各ダムロールの上流側および下流側に各々鋼板１に通電するためのコンダクターロール２とバックアップロール３が配置されている。   FIG. 1 is a schematic cross-sectional view showing a configuration example of a main part of a first embodiment of a plating apparatus according to an embodiment of the present invention. In this apparatus, the electrodes 7 and 7 are arranged so as to sandwich both surfaces of the steel plate 1 with respect to the steel plate 1 that runs continuously and horizontally, and the dam roll 5 that dams the plating solution 4 on the upstream side and the downstream side of the electrode 7 respectively. A conductor roll 2 and a backup roll 3 for energizing the steel plate 1 are disposed on the upstream side and the downstream side of each dam roll.

ノズルヘッダ６は、電極７の背面（電極７の鋼板１とは反対側のことである。本明細書では、反鋼板側とも記載する。）に該電極７から離れて配置されている。ノズルヘッダ６は電極７に対向する部分は電極７に略平行で、該部分にめっき液４を噴射する多数の小孔（めっき液噴出口。本明細書では単に「孔」とも記載する。）８が設けられている。電極７には、前記小孔８から噴射されためっき液４を鋼板１に向かって案内するために、前記孔と同形状の多数の小孔（貫通孔。本明細書では単に「孔」とも記載する。）９が電極７を貫通して設けられている。電極７の孔９はノズルヘッダ６の孔８に対応する位置、すなわちノズルヘッダ６の孔８と電極７の孔９はそれぞれの中心位置が同じ位置になるように設けられている。   The nozzle header 6 is disposed away from the electrode 7 on the back surface of the electrode 7 (on the opposite side of the electrode 7 from the steel plate 1. In this specification, it is also referred to as the anti-steel plate side). The portion of the nozzle header 6 that faces the electrode 7 is substantially parallel to the electrode 7, and has a large number of small holes (plating solution outlets, which are also simply referred to as “holes” in this specification). 8 is provided. In order to guide the plating solution 4 sprayed from the small hole 8 toward the steel plate 1, the electrode 7 has a large number of small holes (through holes. In this specification, it is simply referred to as “hole”. 9) is provided through the electrode 7. The hole 9 of the electrode 7 is provided at a position corresponding to the hole 8 of the nozzle header 6, that is, the hole 8 of the nozzle header 6 and the hole 9 of the electrode 7 are provided so that their center positions are the same position.

図２は、本装置に配置するノズルヘッダ６の孔（めっき液噴出口）８と電極７の孔（貫通孔）９の配置状態の一例を説明する概略平面図である。ノズルヘッダ６に多数の孔（めっき液噴出口）８が配置されている。電極７にもノズルヘッダ６の孔８に対応する位置に孔（貫通孔）９が配置されている。   FIG. 2 is a schematic plan view for explaining an example of the arrangement state of the holes (plating solution jet nozzles) 8 of the nozzle header 6 and the holes (through holes) 9 of the electrodes 7 arranged in the present apparatus. A large number of holes (plating solution outlets) 8 are arranged in the nozzle header 6. A hole (through hole) 9 is also arranged in the electrode 7 at a position corresponding to the hole 8 of the nozzle header 6.

鋼板１に衝突するめっき液の流速は、孔の中心位置が最も速く、その位置から離れると流速が低下する。そのため、鋼板幅方向にみた場合、常に孔がある部分とない部分とができてしまうとむらが生じやすくなることから、孔８及び孔９は、図２に示すように、等間隔で配置し、孔８、孔９は鋼板進行方向の一直線上に配列せずに、鋼板１の進行方向に対して角度をもたせた配列にした方がよい。なお、図２中、符号Ａは鋼板の進行方向を示し、符号Ｂはノズルヘッダ６の孔９の配列方向を示す。孔８、孔９は符号Ｂの方向に対して千鳥配置されている。鋼板の進行方向（符号Ａの方向）を符号Ｂの方向に対してある角度を持たせることにより、孔８、孔９は、該符号Ａの方向（鋼板進行方向）に一直線上に配列されなくなる。   As for the flow rate of the plating solution that collides with the steel plate 1, the center position of the hole is the fastest, and the flow rate decreases as the distance from the position is increased. Therefore, when viewed in the width direction of the steel sheet, unevenness is likely to occur if there are always a portion with and without a hole. Therefore, the holes 8 and 9 are arranged at equal intervals as shown in FIG. The holes 8 and 9 should not be arranged on a straight line in the traveling direction of the steel sheet but should be arranged at an angle with respect to the traveling direction of the steel sheet 1. In FIG. 2, the symbol A indicates the traveling direction of the steel plate, and the symbol B indicates the arrangement direction of the holes 9 of the nozzle header 6. The holes 8 and 9 are arranged in a staggered manner with respect to the direction of B. By making the traveling direction of the steel sheet (the direction of the reference sign A) at an angle with respect to the direction of the reference sign B, the holes 8 and 9 are not arranged in a straight line in the direction of the reference sign A (the traveling direction of the steel sheet). .

本明細書ではこのような多数の小孔が配置されたノズルヘッダを多孔ノズルとも記載する。同様に電極に多数の小孔が配置されている場合、このような形状の電極を、多孔を有する電極とも記載する。   In this specification, such a nozzle header in which a large number of small holes are arranged is also referred to as a porous nozzle. Similarly, when a large number of small holes are arranged in the electrode, the electrode having such a shape is also referred to as a porous electrode.

このような多孔ノズルを用いる利点は、鋼板界面に形成される境界層の効果的な破壊にある。つまり、鋼板の界面には境界層が形成されているが、この境界層内の流れは少ないため、めっき液中のイオンの鋼板への供給が落ちてしまう。例えば、鋼板に平行にめっき液を流すと、めっき液の進行方向に境界層が発達していき、めっき効率が落ちてしまう。従って、境界層を極力薄くすることが、鋼板へのめっき液中のイオンの供給を効果的に行うことにつながる。   The advantage of using such a perforated nozzle is in the effective destruction of the boundary layer formed at the steel plate interface. That is, a boundary layer is formed at the interface of the steel sheet, but since the flow in the boundary layer is small, the supply of ions in the plating solution to the steel sheet is reduced. For example, when a plating solution is allowed to flow in parallel to the steel sheet, a boundary layer develops in the traveling direction of the plating solution, and the plating efficiency is lowered. Therefore, making the boundary layer as thin as possible leads to effectively supplying ions in the plating solution to the steel sheet.

電極７の孔９は、ノズルヘッダ６の孔（めっき液噴出口）８から噴射されるめっき液の噴流が電極７の孔９内に確実に導入されることが好ましい。ノズルヘッダ６の孔８より噴射されためっき液はその進行とともに徐々に広がるため、電極７の孔９の大きさは、ノズルヘッダ６の孔８と同等以上でその３倍以下の範囲とする方がよい。また、ノズルヘッダ６と電極７の間隔は、ノズルヘッダ６の孔８より噴射されためっき液の噴流の幅が電極７の孔９の大きさ以下となる間隔が好ましい。   In the hole 9 of the electrode 7, it is preferable that the jet of the plating solution injected from the hole (plating solution outlet) 8 of the nozzle header 6 is reliably introduced into the hole 9 of the electrode 7. Since the plating solution sprayed from the hole 8 of the nozzle header 6 gradually spreads as it progresses, the size of the hole 9 of the electrode 7 should be equal to or larger than that of the hole 8 of the nozzle header 6 and not more than three times that of the hole. Is good. Further, the interval between the nozzle header 6 and the electrode 7 is preferably an interval in which the width of the jet of the plating solution injected from the hole 8 of the nozzle header 6 is equal to or smaller than the size of the hole 9 of the electrode 7.

孔８、孔９の形状は円形に限定されず、例えば楕円形、矩形であってもよい。孔８の内径ｄは、φ１ｍｍ〜φ１０ｍｍ程度が望ましい。ここで、孔とは、孔８が円形の場合は孔８の直径であり、孔８が矩形、楕円形等のように円形でない場合は孔断面積を面積が等価の円形としたときの円の直径のことである。効率的にめっきを行うためには、孔８の間隔Ｌdは等間隔が望ましく、孔９の間隔Ｌdは電極と鋼板間の距離Ｈの１〜１０倍が好ましく、１．５倍〜４倍程度がより好ましい。また、孔８の直径ｄと電極と鋼板間の距離Ｈは、Ｈ／ｄが１〜１５の範囲が好ましく、５〜８の範囲がより好ましい。 The shape of the holes 8 and 9 is not limited to a circle, and may be, for example, an ellipse or a rectangle. The inner diameter d of the hole 8 is preferably about φ1 mm to φ10 mm. Here, the hole is the diameter of the hole 8 when the hole 8 is circular, and when the hole 8 is not circular such as a rectangle or an ellipse, the hole cross-sectional area is a circle having an equivalent area. Is the diameter of In order to perform plating efficiently, the interval L d between the holes 8 is preferably equal, and the interval L d between the holes 9 is preferably 1 to 10 times the distance H between the electrode and the steel plate, and 1.5 to 4 times. About double is more preferable. Further, the diameter d of the hole 8 and the distance H between the electrode and the steel plate are preferably in the range of H / d of 1 to 15, more preferably in the range of 5 to 8.

めっき液噴出口８先端が鋼板１から離れすぎると、めっき液噴流の流速が鋼板衝突位置で減衰し、濃度境界層と速度境界層の発達を抑制する作用が低下するため、Ｚｎイオンの供給効率が低下する。係る観点から、鋼板１と電極７の距離をａ、電極７の厚さをｂとしたときに、めっき液噴出口８先端と鋼板１との距離Ｈは、Ｈ≦ａ＋３ｂ／２（但し、ａ＋ｂ＜Ｈ）を満足することが好ましい。   If the tip of the plating solution jet outlet 8 is too far from the steel plate 1, the flow rate of the plating solution jet is attenuated at the collision position of the steel plate, and the effect of suppressing the development of the concentration boundary layer and the velocity boundary layer is reduced. Decreases. From this viewpoint, when the distance between the steel plate 1 and the electrode 7 is a and the thickness of the electrode 7 is b, the distance H between the tip of the plating solution jet 8 and the steel plate 1 is H ≦ a + 3b / 2 (however, a + b <H) is preferably satisfied.

本装置では、電極７を陽極、水平方向に走行する鋼板１を陰極として通電することで鋼板にめっきする。その際に、めっき液４はめっき液供給ポンプ（図示なし）で加圧されてノズルヘッダ６に送られ、ノズルヘッダ６の多数の孔（小孔）８から噴出され、電極７の多数の孔（小孔）９内を通過し、鋼板面にほぼ垂直に衝突する。電極７の多数の孔９から、鋼板１面に対してほぼ垂直方向にめっき液４を噴射することにより、鋼板近傍のＺｎイオンの濃度境界層、およびめっき液の速度境界層を打破り、各境界層の発達を抑制できるので、Ｚｎイオンの鋼板への供給が効率的となり、限界電流密度を飛躍的に高めることができる。   In this apparatus, the steel plate is plated by energizing the electrode 7 as an anode and the steel plate 1 running in the horizontal direction as a cathode. At that time, the plating solution 4 is pressurized by a plating solution supply pump (not shown), sent to the nozzle header 6, ejected from a large number of holes (small holes) 8 in the nozzle header 6, and a large number of holes in the electrode 7. It passes through the (small hole) 9 and collides with the steel plate surface almost perpendicularly. By injecting the plating solution 4 from a large number of holes 9 in the electrode 7 in a direction substantially perpendicular to the surface of the steel plate 1, the Zn ion concentration boundary layer and the plating solution velocity boundary layer in the vicinity of the steel plate are broken. Since the development of the boundary layer can be suppressed, the supply of Zn ions to the steel sheet becomes efficient, and the limit current density can be dramatically increased.

めっき液４は鋼板面に対し垂直に噴射するのが最も効率が良いが、鋼板の走行速度、鋼板サイズ等の条件により鋼板面に対して９０度の方向（垂線方向）を中心にこの垂線から４５度程度以内に傾斜した範囲で噴射してもよい。本明細書において、ほぼ垂直方向とは、鋼板面に対して９０度の方向（垂線方向）を中心にこの垂線から４５度程度以内に傾斜した範囲も許容範囲として含むという意味である。めっき液の噴射流量は、必要な限界電流密度に合わせて、調整すればよい。   It is most efficient to spray the plating solution 4 perpendicularly to the steel plate surface, but depending on conditions such as the traveling speed of the steel plate, the steel plate size, etc., the 90 ° direction (perpendicular direction) from the normal to the steel plate surface You may inject in the range which inclined within about 45 degree | times. In the present specification, the term “substantially perpendicular” means that an allowable range also includes a range tilted within about 45 degrees from the perpendicular with a 90-degree direction (perpendicular direction) as a center with respect to the steel plate surface. The injection flow rate of the plating solution may be adjusted according to the necessary limit current density.

本装置を用いてめっきすると、鋼板１に衝突しためっき液は電極７の孔９の壁部近傍をめっき液の噴射方向と逆の方向に流れ、ノズルヘッダ６のヘッダ部と電極間に流れ出ることで、めっき時に発生する気泡が鋼板−電極間の領域に溜まることを抑制し、また鋼板１近傍の亜鉛イオンの濃度境界層とめっき液の速度境界層の発達を抑制する効果がある。ノズルヘッダ６と電極７の間隔は、電極７の孔９の壁部近傍から流れ出ためっき液がさらに系外にスムーズに流れ出る適宜の間隔、例えば電極と鋼板の間隔以上であることが好ましい。   When plating is performed using this apparatus, the plating solution that has collided with the steel plate 1 flows in the direction near the wall portion of the hole 9 of the electrode 7 in the direction opposite to the spraying direction of the plating solution, and flows between the header portion of the nozzle header 6 and the electrode. Thus, it is possible to suppress the generation of bubbles generated during plating in the region between the steel plate and the electrode, and to suppress the development of the zinc ion concentration boundary layer and the plating solution velocity boundary layer in the vicinity of the steel plate 1. The interval between the nozzle header 6 and the electrode 7 is preferably equal to or more than an appropriate interval at which the plating solution flowing out from the vicinity of the wall portion of the hole 9 of the electrode 7 flows out of the system more smoothly, for example, between the electrode and the steel plate.

図３は、本発明の実施の形態に係るめっき装置の第２の実施形態の要部構成例を示す概略断面図である。本装置では、ノズルヘッダ６は、ノズルヘッダ６本体に対して突起して形成された多数のノズル（めっき液噴出管）８ａが配置され、該ノズル８ａは、ノズルヘッダ６本体に対して突起状に形成されている。ノズルヘッダ６のノズル８ａと電極７の孔（貫通孔）９はそれぞれの中心位置が対応する位置に設けられている。   FIG. 3 is a schematic cross-sectional view showing a configuration example of a main part of the second embodiment of the plating apparatus according to the embodiment of the present invention. In this apparatus, the nozzle header 6 is provided with a large number of nozzles (plating solution ejection pipes) 8 a formed so as to protrude from the main body of the nozzle header 6, and the nozzle 8 a has a protruding shape relative to the main body of the nozzle header 6. Is formed. The nozzle 8a of the nozzle header 6 and the hole (through hole) 9 of the electrode 7 are provided at positions corresponding to the center positions thereof.

図３の装置では、ノズル８ａの外法は、電極７の孔９の内法より小さいことが好ましい。ノズル８ａの外法とは、ノズル８ａの外側の寸法であり、孔９の内法とは孔９の内側の寸法であるので、ノズル８ａの外法が電極７の孔９の内法より小さいと、ノズル８ａの突起部分は孔９内に装入または、さらに孔９を通過させて鋼板−電極間に突出させて存在させることが可能である。この場合、ノズル８ａの外面と孔９内面の間に隙間がある。   In the apparatus of FIG. 3, the outer method of the nozzle 8 a is preferably smaller than the inner method of the hole 9 of the electrode 7. The outer method of the nozzle 8a is the outer dimension of the nozzle 8a, and the inner method of the hole 9 is the inner dimension of the hole 9. Therefore, the outer method of the nozzle 8a is smaller than the inner method of the hole 9 of the electrode 7. Then, the protruding portion of the nozzle 8a can be inserted into the hole 9 or can be allowed to pass through the hole 9 and protrude between the steel plate and the electrode. In this case, there is a gap between the outer surface of the nozzle 8a and the inner surface of the hole 9.

ノズル８ａ先端が鋼板１に近づきすぎると、ノズル８ａが電極−鋼板間の電流分布を乱すことで、抵抗電圧を上昇させたり、めっきむらを発生させたりする。鋼板１と電極７の距離をａ、電極７の厚さをｂとしたときに、ノズル８ａ先端と鋼板１との距離Ｈは、
ｂ≦４ａ／３の場合、ａ−ｂ／２≦Ｈ
ｂ＞４ａ／３の場合、ａ／３≦Ｈ
を満足することが好ましい。ノズル８ａ先端と鋼板１との距離Ｈが前述の式を満足すると、ノズル８ａが電極−鋼板間の電流分布を乱すことを防止し、それによって抵抗電圧の上昇を回避することができ、また鋼板幅方向の電流密度分布むらの発生を抑制してめっきむらを防止する効果が優れる。 If the tip of the nozzle 8a is too close to the steel plate 1, the nozzle 8a disturbs the current distribution between the electrode and the steel plate, thereby increasing the resistance voltage or causing uneven plating. When the distance between the steel plate 1 and the electrode 7 is a and the thickness of the electrode 7 is b, the distance H between the tip of the nozzle 8a and the steel plate 1 is
In the case of b ≦ 4a / 3, a−b / 2 ≦ H
When b> 4a / 3, a / 3 ≦ H
Is preferably satisfied. When the distance H between the tip of the nozzle 8a and the steel plate 1 satisfies the above formula, the nozzle 8a can be prevented from disturbing the current distribution between the electrode and the steel plate, thereby avoiding an increase in resistance voltage. The effect of preventing uneven plating by suppressing the occurrence of uneven current density distribution in the width direction is excellent.

一方、ノズル８ａ先端が鋼板１から離れすぎると、めっき液噴流の流速が鋼板衝突位置で減衰し、濃度境界層と速度境界層の発達を抑制する作用が低下するため、Ｚｎイオンの供給効率が低下するので、ノズル８ａ先端と鋼板１との距離Ｈは、Ｈ≦ａ＋３ｂ／２を満足することが好ましい。ノズル８ａ先端と鋼板１との距離Ｈが、Ｈ≦ａ＋３ｂ／２を満足すると、鋼板１近傍のめっき液４の濃度境界層と速度境界層の発達を抑制する効果がより優れることによる。   On the other hand, if the tip of the nozzle 8a is too far from the steel plate 1, the flow rate of the plating solution jet is attenuated at the steel plate collision position, and the effect of suppressing the development of the concentration boundary layer and the velocity boundary layer is reduced. Therefore, the distance H between the tip of the nozzle 8a and the steel plate 1 preferably satisfies H ≦ a + 3b / 2. When the distance H between the tip of the nozzle 8a and the steel plate 1 satisfies H ≦ a + 3b / 2, the effect of suppressing the development of the concentration boundary layer and the velocity boundary layer of the plating solution 4 in the vicinity of the steel plate 1 is more excellent.

なお、本発明では、電極厚さ自体は特に規定しないが、通常５〜５０ｍｍ程度の厚さである。   In the present invention, the electrode thickness itself is not particularly defined, but is usually about 5 to 50 mm.

ノズルヘッダ６のノズル（めっき液噴出管）８ａ配置の考え方、電極７の孔（貫通孔）９配置の考え方は、前述の図１の装置における孔（めっき液噴出口）８及び孔（貫通孔）９の場合と同様である。ノズル８ａの形状（外法形状）、孔９の形状についても、円形に限定されず、楕円形、矩形であってもよい。ノズル８ａの形状と孔９の形状は異なっていてもよい。めっき液の鋼板面への噴射角度、噴射量の考え方は、前述の図１の場合と同様である。   The concept of the arrangement of the nozzle (plating solution ejection pipe) 8a of the nozzle header 6 and the arrangement of the hole (through hole) 9 of the electrode 7 are the same as those of the apparatus shown in FIG. ) Same as 9). The shape of the nozzle 8a (external shape) and the shape of the hole 9 are not limited to a circle but may be an ellipse or a rectangle. The shape of the nozzle 8a and the shape of the hole 9 may be different. The concept of the spray angle and spray amount of the plating solution onto the steel plate surface is the same as in the case of FIG.

図３の装置を用いてめっき鋼板を製造する方法は、前記した図１の装置を用いてめっき鋼板を製造する場合と同様にして行うことができる。本装置では、ノズルヘッダ６のノズル８ａから鋼板面にほぼ垂直にめっき液４を噴射する。めっき液４は、ノズル８ａと電極７の孔９を通過し、鋼板１に到達する。ノズルヘッダ本体に対して突起して配置したノズル８ａからめっき液を噴射することで、鋼板１近傍のＺｎイオンの濃度境界層、およびめっき液の速度境界層を打破り、各境界層の発達を抑制する効果が優れ、Ｚｎイオンの鋼板への供給が効率的となり、限界電流密度を飛躍的に高めることができる。   The method for producing a plated steel sheet using the apparatus of FIG. 3 can be performed in the same manner as in the case of producing a plated steel sheet using the apparatus of FIG. In this apparatus, the plating solution 4 is sprayed from the nozzle 8a of the nozzle header 6 substantially perpendicularly to the steel plate surface. The plating solution 4 passes through the nozzle 8 a and the hole 9 of the electrode 7 and reaches the steel plate 1. By spraying the plating solution from the nozzle 8a that is arranged so as to protrude from the nozzle header body, the Zn ion concentration boundary layer and the plating solution velocity boundary layer in the vicinity of the steel plate 1 are broken, and the development of each boundary layer is achieved. The suppression effect is excellent, the supply of Zn ions to the steel sheet becomes efficient, and the critical current density can be dramatically increased.

従来技術の鋼板面に平行にめっき液を流す方法では、速度境界層が発達し易く、境界層内はめっき液の流れが遅いため、めっき時に発生する気泡が電極から鋼板間の境界層内に溜まりやすくなり、抵抗電圧の上昇が避けられなかった。しかし、図３の装置では、ノズル８ａの外法を電極７に設けた孔９の内法より小さくすることにより、図４に示すように、鋼板１に衝突しためっき液の戻り液を、電極７の孔９とノズル８ａとの隙間から、電極７とノズルヘッダ６間に逃がすことが可能となり、鋼板１近傍へのＺｎイオンの供給をスムーズにし、さらに、めっき時に発生する気泡が電極−鋼板間に溜まるのを抑制し、抵抗電圧を低減させることが可能となる。   In the conventional method of flowing the plating solution parallel to the steel plate surface, the velocity boundary layer is easily developed, and the flow of the plating solution is slow in the boundary layer, so that bubbles generated during plating are generated in the boundary layer between the electrode and the steel plate. It became easy to accumulate, and an increase in resistance voltage was inevitable. However, in the apparatus of FIG. 3, by making the outer method of the nozzle 8 a smaller than the inner method of the hole 9 provided in the electrode 7, as shown in FIG. 7 can be released between the electrode 7 and the nozzle header 6 through the gap between the hole 9 and the nozzle 8a, and the supply of Zn ions to the vicinity of the steel plate 1 can be made smooth. It is possible to suppress accumulation between them and reduce the resistance voltage.

図５は本発明の実施の形態に係るめっき装置の第３の実施の形態の要部構成例を示す概略断面図である。本装置では、図３に示した装置において、電極７のノズルヘッダ６からのめっき液を鋼板１と電極７間の領域に案内するための孔９同士の間に、鋼板１と電極７間の領域のめっき液を排出するための複数の孔（めっき液排出口）１１が設けられている。   FIG. 5 is a schematic cross-sectional view showing a configuration example of a main part of a third embodiment of the plating apparatus according to the embodiment of the present invention. In this apparatus, in the apparatus shown in FIG. 3, between the holes 9 for guiding the plating solution from the nozzle header 6 of the electrode 7 to the region between the steel sheet 1 and the electrode 7, between the steel sheet 1 and the electrode 7. A plurality of holes (plating solution discharge ports) 11 for discharging the plating solution in the region are provided.

図６は、図５の装置の電極７に配置される孔（貫通孔）９と孔（めっき液排出口）１１の配置状態の一例を示す概略平面図である。本図では、図２に示した孔（貫通孔）９が配置された電極７において、孔（めっき液液排出口）１１は隣り合う孔（貫通孔）９の中間位置に設けられている。孔（めっき液排出口）１１が大きくなると電極面積が減少し、電極〜鋼板間の抵抗が増大するため、孔（めっき液排出口）１１の大きさは、孔（貫通孔）８より小さいことが好ましい。孔１１の形状は特に限定されない。   FIG. 6 is a schematic plan view showing an example of an arrangement state of holes (through holes) 9 and holes (plating solution discharge ports) 11 arranged in the electrode 7 of the apparatus of FIG. In this figure, in the electrode 7 in which the hole (through hole) 9 shown in FIG. 2 is arranged, the hole (plating solution discharge port) 11 is provided at an intermediate position between the adjacent holes (through holes) 9. When the hole (plating solution discharge port) 11 becomes larger, the electrode area decreases and the resistance between the electrode and the steel plate increases, so the size of the hole (plating solution discharge port) 11 is smaller than the hole (through hole) 8. Is preferred. The shape of the hole 11 is not particularly limited.

図５の装置を用いてめっき鋼板を製造する方法は、前記した図３の装置を用いてめっき鋼板を製造する場合と同様にして行うことができる。本装置では、ノズルヘッダ６のめっき液は、ノズル（めっき液噴出管）８ａから鋼板に噴射され、鋼板−電極間に噴射されためっき液は孔（めっき液液排出口）１１からも排出される。   The method of manufacturing a plated steel sheet using the apparatus of FIG. 5 can be performed similarly to the case of manufacturing a plated steel sheet using the apparatus of FIG. 3 described above. In this apparatus, the plating solution of the nozzle header 6 is sprayed from the nozzle (plating solution jet pipe) 8 a onto the steel plate, and the plating solution sprayed between the steel plate and the electrode is also discharged from the hole (plating solution discharge port) 11. The

従来の水平噴流型のめっきセルの場合、鋼板面からの戻り液が特にめっきセル内の中央部付近で滞留しやすく、さらに、鋼板１または電極７近傍で速度境界層が発達するために、Ｚｎイオンの供給が妨げられるばかりではなく、めっき時に発生する気泡がめっき液が滞留した部分に溜まり易くなり、限界電流密度の低下および高抵抗電圧でのめっきが避けられなかった。以下に説明するように、本装置を用いることで、前述の従来装置の問題点が解消される。   In the case of a conventional horizontal jet type plating cell, the return liquid from the steel plate surface tends to stay particularly in the vicinity of the central portion in the plating cell, and further, a velocity boundary layer develops in the vicinity of the steel plate 1 or the electrode 7. Not only is the supply of ions impeded, but bubbles generated during plating tend to accumulate in the portion where the plating solution stays, and reduction of the critical current density and plating at a high resistance voltage cannot be avoided. As described below, by using this apparatus, the above-described problems of the conventional apparatus are solved.

図７は、図５のめっき装置におけるめっき液の流れを説明する図である。図５の装置を用いて、ノズルヘッダ６のノズル８ａからめっき液４を鋼板面に対してほぼ垂直方向に噴射しながらめっきすると、ノズルヘッダ６内のめっき液４は、ノズル８ａと電極７の孔９を通過し、鋼板１に衝突する。電極７に対して、前記孔９同士の間にさらに孔１１を設けることにより、めっき時に発生する気泡を含んだめっき液の戻り液を孔９とノズル８ａとの間隙部分からだけでなく、孔１１から効率的に逃がすことが可能となる。これによって、電極７と鋼板１間に新鮮なめっき液の供給を効率的に行うことが可能となる。また鋼板１からの戻り液がめっきセル内の中央部付近で滞留するのを防止し、さらに、鋼板１または電極７近傍での速度境界層の発達を抑制して、鋼板近傍へのＺｎイオンの供給が一層促進される。また、鋼板幅方向での流速むらの発生が防止される。   FIG. 7 is a view for explaining the flow of the plating solution in the plating apparatus of FIG. When plating is performed while spraying the plating solution 4 from the nozzle 8 a of the nozzle header 6 in a direction substantially perpendicular to the steel plate surface using the apparatus of FIG. 5, the plating solution 4 in the nozzle header 6 is applied to the nozzle 8 a and the electrode 7. It passes through the hole 9 and collides with the steel plate 1. By providing a hole 11 between the holes 9 with respect to the electrode 7, not only from the gap portion between the hole 9 and the nozzle 8a, but also the return liquid of the plating solution containing bubbles generated at the time of plating. 11 can be efficiently escaped. This makes it possible to efficiently supply a fresh plating solution between the electrode 7 and the steel plate 1. Further, the return liquid from the steel plate 1 is prevented from staying in the vicinity of the central portion in the plating cell, and further, the development of the velocity boundary layer in the vicinity of the steel plate 1 or the electrode 7 is suppressed, so that the Zn ions in the vicinity of the steel plate can be prevented. Supply is further promoted. Moreover, the occurrence of uneven flow velocity in the steel plate width direction is prevented.

前記した図１の装置において、電極７の孔９同士の間に、図５の装置と同様の孔（めっき液排出口）１１を設けてもよい。この場合も、前記と同様の作用効果が発現される。   In the apparatus of FIG. 1 described above, a hole (plating solution discharge port) 11 similar to that of the apparatus of FIG. 5 may be provided between the holes 9 of the electrode 7. Also in this case, the same effect as described above is exhibited.

前述の図３、図５の装置においては、めっき液噴出管間隔：Ｌd、めっき液噴出管先端と鋼板の距離：Ｈ、めっき液噴出管の内径：ｄは、１≦Ｌd／Ｈ≦１０、且つ、１≦Ｈ／ｄ≦１５を満足させるようにすることが好ましい。 3 and 5, the plating solution ejection pipe interval: L d , the distance between the plating solution ejection pipe tip and the steel plate: H, the inner diameter of the plating solution ejection pipe: d is 1 ≦ L d / H ≦ 10 and 1 ≦ H / d ≦ 15 are preferably satisfied.

ポンプ流量を一定とし、Ｌd／Ｈを変化させてめっきしたときに良好なめっき外観が得られる限界電流密度を調査した。その結果、Ｌd／Ｈが２．８のときに限界電流密度が最も高くなり、Ｌd／Ｈが２．８以下ではＬd／Ｈが小さくなるとそれに応じて限界電流密度が低下し、Ｌd／Ｈが２．８以上ではＬd／Ｈが大きくなるとそれに応じて限界電流密度が低下することが明らかになった。 The limit current density at which a good plating appearance was obtained when plating was performed with the pump flow rate constant and L d / H varied was investigated. As a result, the limit current density is the highest when L d / H is 2.8, and when L d / H is 2.8 or less, the limit current density decreases accordingly as L d / H decreases. It was found that when d / H is 2.8 or more, the limit current density is lowered as L d / H increases.

Ｌd／Ｈ＜２．８の領域では、流速ｕ＝流量Ｑ／噴出口面積Ａnozzleの関係より、Ｌd／Ｈを小さくすると、それに応じて電極に占める噴出口面積が大きくなり、Ｓｈ数（物質伝達量の無次元数）が小さくなる。その結果、めっき液の流速が下がるため、Ｚｎイオンの供給が鈍り、限界電流密度が低下する。１≦Ｌd／Ｈとすることで限界電流密度の低下を防止して、従来の鋼板水平方向にめっき液を噴射するめっきセル（水平噴流型のめっきセル）に比べ、効率的なめっきが可能となる。 In the region of L d /H<2.8, from the relationship of flow velocity u = flow rate Q / jet outlet area A nozzle , if L d / H is reduced, the jet nozzle area occupying the electrode accordingly increases, and the Sh number (Dimensionless number of mass transfer) is reduced. As a result, since the flow rate of the plating solution is lowered, the supply of Zn ions becomes dull, and the limit current density is lowered. By setting 1 ≦ L d / H, the reduction of the limit current density is prevented, and more efficient plating is possible compared to the conventional plating cell (horizontal jet type plating cell) that sprays the plating solution in the horizontal direction of the steel sheet. It becomes.

Ｌd／Ｈ＞２．８の領域では、Ｌd／Ｈを大きくすると，それに応じて、噴出口配置が粗くなり，Ｓｈ数（物質伝達量の無次元数）が大きくなる。噴出口配置が粗くなる（ノズル間隔が広がる）と、噴出口直下の鋼板面のみにＺｎイオンの供給が促進されて優先的にめっきされ、よどみ点から離れた鋼板に沿う流れである壁面噴流領域付近では、めっき液噴流が充分に行き届かず、さらに、境界層が発達し易いために、Ｚｎイオンの供給が少なくなり、この部分でめっきやけが発生しやすくなる。その結果、鋼板全体の限界電流密度が低下する。Ｌd／Ｈ≦１０とすることにより、よどみ点から離れた鋼板に沿う流れである壁面噴流領域付近に充分にめっき液を供給できるようになり、従来の水平噴流型のめっきセルに比べ、効率的なめっきが可能となる。 In the region of L d /H>2.8, when L d / H is increased, the jet outlet arrangement is coarsened accordingly, and the Sh number (dimensionless number of substance transfer amount) is increased. When the jet nozzle arrangement becomes rough (the nozzle interval is widened), the supply of Zn ions is promoted only on the steel plate surface directly below the jet nozzle, and the plating is preferentially plated, and the wall jet region is a flow along the steel plate away from the stagnation point. In the vicinity, the plating solution jet does not reach sufficiently, and the boundary layer easily develops, so that the supply of Zn ions is reduced, and plating burns easily occur in this portion. As a result, the limit current density of the entire steel sheet is reduced. By setting L d / H ≦ 10, the plating solution can be sufficiently supplied in the vicinity of the wall jet region, which is a flow along the steel plate away from the stagnation point, and compared with the conventional horizontal jet type plating cell. Plating becomes possible.

以上から、Ｌd／Ｈ、１≦Ｌd／Ｈ≦１０を満足することが好ましい。より好ましい範囲は、１．５≦Ｌd／Ｈ≦４である。 From the above, it is preferable that L d / H and 1 ≦ L d / H ≦ 10 are satisfied. A more preferable range is 1.5 ≦ L d / H ≦ 4.

また、めっき液噴出口内径ｄが、１≦Ｈ／ｄ≦１５を満足すると、従来の水平噴流型のめっきセルに比べ、効率的にＺｎイオンの供給を行うことが可能となる。ｄは、５≦Ｈ／ｄ≦８を満足することが特に好ましい。
めっき液をめっき液噴出管から噴出すると、めっき液噴出管出口付近で生成したせん断渦が成長し、合体してその下流で渦糸が不安定になり、***して大きなスケールの乱れ渦となる。この状態で鋼板面に衝突したとき最も物質伝達が大きくなると考えられる。このような噴流の特徴として、流れが非常に乱れて３次元的な動きをしており、定常乱流のような状態ではなく、強い継続的な非定常性がある。大きなスケールの乱れが断続的に衝突して、境界層を断続的に剥離することにより鋼板界面でのめっき液の更新が起きる。この界面更新でのめっき液により、物質伝達が大きくなると考えられる。 Moreover, when the plating solution jet nozzle inner diameter d satisfies 1 ≦ H / d ≦ 15, Zn ions can be efficiently supplied as compared with a conventional horizontal jet type plating cell. It is particularly preferable that d satisfies 5 ≦ H / d ≦ 8.
When the plating solution is ejected from the plating solution ejection tube, the shear vortex generated near the plating solution ejection tube outlet grows, coalesces, and the vortex becomes unstable downstream, and splits into large scale turbulent vortices. . In this state, it is considered that the mass transfer becomes the largest when it collides with the steel plate surface. As a feature of such a jet, the flow is very turbulent and moves three-dimensionally, and is not in a state like a steady turbulent flow but has a strong continuous unsteadiness. Large scale disturbances intermittently collide and the boundary layer is intermittently peeled off, so that the plating solution is renewed at the steel plate interface. It is considered that mass transfer is increased by the plating solution at the interface renewal.

Ｈ／ｄが１未満では、めっき液噴出管出口付近で生成したせん断渦の成長・合体が不十分のため、大きなスケールの乱れ渦ができない。Ｈ／ｄが１５超になると、大きなスケールの乱れ渦の成長・合体による下流の渦糸が安定化し大きなスケールの乱れ渦がなくなる。Ｈ／ｄが５〜８の範囲内においては物質伝達係数が高くなるため前記大きなスケールの乱れ渦の作用が特に優れると考えられる。   If H / d is less than 1, large scale turbulent vortices cannot be formed because of insufficient growth and coalescence of shear vortices generated near the outlet of the plating solution jet pipe. When H / d exceeds 15, the downstream vortex is stabilized by the growth and coalescence of large-scale turbulent vortices, and large-scale turbulent vortices disappear. When the H / d is in the range of 5 to 8, the mass transfer coefficient becomes high, so that the large scale turbulence vortex is considered to be particularly excellent.

また、前述の図１の装置においても、上記と同様の理由から、めっき液噴出口間隔：Ｌd、めっき液噴出口先端と鋼板の距離：Ｈ、めっき液噴出口の内径：ｄは、１≦Ｌd／Ｈ≦１０、且つ、１≦Ｈ／ｄ≦１５を満足させるようにすることが好ましい。 In the apparatus of FIG. 1 described above, for the same reason as described above, the plating solution jetting interval: L d , the distance between the plating solution jetting tip and the steel plate: H, the inner diameter of the plating solution jetting port: d is 1 It is preferable to satisfy ≦ L d / H ≦ 10 and 1 ≦ H / d ≦ 15.

図８は本発明の実施の形態に係るめっき装置の第４の実施形態の要部構成例を示す概略断面図である。図８の装置では、連続的に水平に走行する鋼板１に対して、鋼板１両面を挟むように電極７、７が配置され、電極７の上流側、下流側に各々めっき液４を堰き止めるダムロール５、前記各ダムロールの上流側および下流側に各々鋼板１に通電するためのコンダクターロール２とバックアップロール３が配置されている。ノズルヘッダ６は電極７の背面（反鋼板１側）に直接取りつけられており、電極７にはノズルヘッダ６のめっき液を鋼板１面に対してほぼ垂直方向に噴射するための多数の孔（めっき液噴出口）９が設けられている。電極７に設ける多数の孔（めっき液噴出口）９は、図２に示すように、鋼板進行方向の一直線上に配列せず、鋼板の進行方向に対して角度をもたせた配列とする。孔（めっき液噴出口）９の大きさ、配列の考え方、めっき液の噴射方向、噴射量の考え方は、図１及び図３の装置の場合と同様である。すなわち、孔９の形状は円形に限定されず、その直径は、φ１ｍｍ〜φ１０ｍｍ程度が望ましい。さらに、効率的にめっきを行うためには、めっき液噴出管間隔：Ｌd、めっき液噴出管先端と鋼板の距離：Ｈ、めっき液噴出管の内径：ｄは、１≦Ｌd／Ｈ≦１０、且つ、１≦Ｈ／ｄ≦１５を満足させるようにすることが好ましく、孔９の間隔Ｌdは等間隔にするのが望ましい。Ｌd／Ｈは１〜４がより好ましい。 FIG. 8: is a schematic sectional drawing which shows the principal part structural example of 4th Embodiment of the plating apparatus which concerns on embodiment of this invention. In the apparatus of FIG. 8, electrodes 7 and 7 are arranged so as to sandwich both surfaces of the steel plate 1 with respect to the steel plate 1 that runs continuously horizontally, and the plating solution 4 is dammed on the upstream side and the downstream side of the electrode 7, respectively. A dam roll 5, a conductor roll 2 and a backup roll 3 for energizing the steel sheet 1 are arranged on the upstream side and the downstream side of each dam roll. The nozzle header 6 is directly attached to the back surface of the electrode 7 (on the side opposite to the steel plate 1), and the electrode 7 has a large number of holes for injecting the plating solution of the nozzle header 6 in a direction substantially perpendicular to the surface of the steel plate 1 ( A plating solution outlet 9 is provided. As shown in FIG. 2, a large number of holes (plating solution outlets) 9 provided in the electrode 7 are not arranged on a straight line in the traveling direction of the steel sheet but are arranged at an angle with respect to the traveling direction of the steel sheet. The size of the holes (plating solution jet nozzles) 9, the concept of the arrangement, the spraying direction of the plating solution, and the concept of the injection amount are the same as those in the apparatus of FIGS. That is, the shape of the hole 9 is not limited to a circle, and the diameter is preferably about φ1 mm to φ10 mm. Further, in order to perform plating efficiently, the plating solution ejection pipe interval: L d , the distance between the plating solution ejection pipe tip and the steel plate: H, the inner diameter of the plating solution ejection pipe: d is 1 ≦ L d / H ≦ 10 and 1 ≦ H / d ≦ 15 are preferably satisfied, and the interval L d between the holes 9 is preferably equal. L d / H is more preferably 1 to 4.

本装置では、加圧されためっき液４は電極７の多数の孔９から鋼板面に噴射し、その表面に衝突させる。電極７の多数の孔９から、鋼板１面に対してほぼ垂直方向にめっき液４を噴射することにより、鋼板近傍のＺｎイオンの濃度境界層、およびめっき液の速度境界層を打破り、各境界層の発達を抑制できるので、Ｚｎイオンの鋼板への供給が効率的となり、限界電流密度を高めることができる。   In this apparatus, the pressurized plating solution 4 is sprayed from the many holes 9 of the electrode 7 onto the steel plate surface and collides with the surface. By injecting the plating solution 4 from a large number of holes 9 in the electrode 7 in a direction substantially perpendicular to the surface of the steel plate 1, the Zn ion concentration boundary layer and the plating solution velocity boundary layer in the vicinity of the steel plate are broken. Since the development of the boundary layer can be suppressed, the supply of Zn ions to the steel sheet becomes efficient, and the limit current density can be increased.

図８の装置において、電極７のめっき液噴出口９同士の間に、図５の場合と同様のめっき液排出口１１を設けることができる。この場合、図９に示すように、めっき液排出口１１に接続してダクト１２を設けてめっき液を系外に排出する必要がある。   In the apparatus of FIG. 8, a plating solution discharge port 11 similar to the case of FIG. 5 can be provided between the plating solution outlets 9 of the electrode 7. In this case, as shown in FIG. 9, it is necessary to connect the plating solution outlet 11 and provide a duct 12 to discharge the plating solution out of the system.

図８の装置において、めっき液噴出口の先端に電極７面より突出しためっき液噴出管を付設してもよい。   In the apparatus of FIG. 8, a plating solution ejection pipe protruding from the surface of the electrode 7 may be provided at the tip of the plating solution ejection port.

低電圧操業のためには、電極と鋼板間の距離を縮めることが最も有効であり、そのためには鋼板のＣ反り矯正、振動抑制が必要である。連続的に走行する鋼板の両面側に鋼板を挟むように各々相対して配置した電極と、前記鋼板に通電するコンダクターロールと、前記鋼板の両面側に各々配置されて鋼板にめっき液を噴射するノズルヘッダを有しためっき装置において、ノズルヘッダを鋼板の走行方向に少なくとも３区画以上に分割し、分割後の各ノズルヘッダは独立して噴流の圧力制御できるようにして、鋼板の上下面の対向するノズルヘッダの圧力を異なるようにするとともに、鋼板の上下面の圧力の大小関係を上流側から下流側にかけて順次逆転させてめっき液を噴射させることで、鋼板のＣ反り、振動を抑制できる。   For low-voltage operation, it is most effective to reduce the distance between the electrode and the steel sheet. To that end, it is necessary to correct the C warp and suppress vibration of the steel sheet. Electrodes arranged opposite to each other so that the steel plates are sandwiched between both sides of the continuously running steel plates, conductor rolls for energizing the steel plates, and sprayed onto the steel plates respectively arranged on both sides of the steel plates In a plating apparatus having a nozzle header, the nozzle header is divided into at least three sections in the running direction of the steel plate, and each nozzle header after division can be independently controlled for jet pressure so that the upper and lower surfaces of the steel plate are opposed to each other. In addition to making the pressure of the nozzle header to be different, the pressure relationship between the upper and lower surfaces of the steel plate is sequentially reversed from the upstream side to the downstream side to inject the plating solution, thereby suppressing the C warpage and vibration of the steel plate.

図１０は本発明の実施の形態に係るめっき装置の第５の実施形態の要部構成例を示す概略断面図である。本装置は、鋼板の走行方向に分割したノズルヘッダを備え、鋼板のＣ反り強制、振動抑制に好適である。鋼板のＣ反り矯正と振動抑制の方法について図面に基いて具体的に説明する。   FIG. 10 is a schematic cross-sectional view showing a configuration example of a main part of a fifth embodiment of the plating apparatus according to the embodiment of the present invention. This apparatus includes a nozzle header divided in the traveling direction of the steel sheet, and is suitable for C-warp forcing and vibration suppression of the steel sheet. A method for correcting C warpage and suppressing vibration of a steel sheet will be specifically described with reference to the drawings.

ノズルヘッダ６は、上下とも鋼板１の搬送方向に沿って４分割されている。鋼板１の上面側の４分割されたノズルヘッダ６ａ、６ｂ、６ｃ、６ｄ、及び鋼板１の下面側のノズルヘッダ６ｅ、６ｆ、６ｇ、６ｈは、各々独立してめっき液の噴出圧力の制御ができるようになっている。各ノズルヘッダの圧力の関係は、６ａ＞６ｅ、６ｂ＜６ｆ、６ｃ＞６ｇ、６ｄ＜６ｈになっている。その結果、例えば、ノズルヘッダ群の最上流部の６ａと６ｅでは、鋼板１は電極間の中心位置より下面側にシフトし、次の６ｂ、６ｆのノズル位置では逆に上面側シフトするため、鋼板１にＬ反りを付与することが可能になる。 The nozzle header 6 is divided into four parts along the conveying direction of the steel plate 1 on both the upper and lower sides. The nozzle headers 6a, 6b, 6c, 6d divided into four on the upper surface side of the steel plate 1 and the nozzle headers 6e, 6f, 6g, 6h on the lower surface side of the steel plate 1 each independently control the jetting pressure of the plating solution. It can be done. The relationship between the pressures of the nozzle headers is 6a> 6e, 6b <6f, 6c> 6g, 6d <6h. As a result, for example, in 6a and 6e in the uppermost stream part of the nozzle header group, the steel plate 1 is shifted to the lower surface side from the center position between the electrodes, and on the contrary, the upper surface side is shifted to the next nozzle position of 6b and 6f L warpage can be imparted to the steel plate 1.

鋼板１のパスラインは平均的には上下の電極間のほぼ中心に位置することが望ましいため、各ノズルヘッダ６ａ、６ｆ、６ｃ、６ｈの圧力、及び各ノズルヘッダ６ｂ、６ｄ、６ｅ、６ｇの圧力は各々等しくした方がよい。また、上下の圧力差は大きい方が、Ｃ反り矯正、振動低減効果があるが、圧力が極端に小さい場合、鋼板１に供給されるＺｎイオンが少なくなり、いわゆるめっき焼けを引き起こす。従って、ノズルヘッダの圧力の最小値はめっき焼けを生じさせないように配慮し、鋼板１の初期のＣ反り量、あるいは振動量に応じて圧力の最大値を決めればよい。   Since it is desirable that the pass line of the steel plate 1 is located at an approximate center between the upper and lower electrodes on average, the pressure of each nozzle header 6a, 6f, 6c, 6h, and each nozzle header 6b, 6d, 6e, 6g Each pressure should be equal. A larger pressure difference between the upper and lower sides has a C-warp correction and vibration reducing effect. However, when the pressure is extremely small, Zn ions supplied to the steel sheet 1 are reduced, and so-called plating burn is caused. Therefore, the minimum value of the pressure of the nozzle header may be determined so as not to cause plating burn, and the maximum value of the pressure may be determined according to the initial C warpage amount or vibration amount of the steel plate 1.

ノズルの形状は鋼板幅方向にスリットを設けたスリットノズルや多孔ノズル等何でもよく、特に限定されるものではない。いずれのノズル形状においてもノズルからほぼ垂直にめっき液を鋼板１に噴射する。ノズルより噴射されためっき液により鋼板１への衝突力を生み、鋼板１を遠ざける方向に押しやろうとする。従って、鋼板１の上下面の衝突力を変えることにより、鋼板１のパスラインを電極間の中心からずらすことができる。これを連続したノズルヘッダ群で行うことにより、鋼板１をＬ反り状態に保持することが可能になる。鋼板１をＬ反りさせるためには、少なくとも３箇所以上の連続した圧力面が必要である。鋼板１の上下面の付着量、あるいは外観を同等にするためには、ノズルヘッダが上下面とも偶数個がより望ましい。   The shape of the nozzle is not particularly limited, and may be anything such as a slit nozzle having a slit in the width direction of the steel plate or a perforated nozzle. In any nozzle shape, the plating solution is sprayed onto the steel plate 1 almost vertically from the nozzle. The plating solution sprayed from the nozzle generates a collision force against the steel plate 1 and tries to push the steel plate 1 away. Therefore, by changing the collision force between the upper and lower surfaces of the steel plate 1, the pass line of the steel plate 1 can be shifted from the center between the electrodes. By performing this with a group of continuous nozzle headers, the steel plate 1 can be held in an L-warped state. In order to warp the steel sheet 1 by L, at least three or more continuous pressure surfaces are required. In order to make the adhesion amount or appearance of the upper and lower surfaces of the steel plate 1 equal, it is more desirable that the nozzle header has an even number on both the upper and lower surfaces.

鋼板１のＣ反り抑制、及び振動低減の効果を大きくするためには、上下面の噴出圧力差を大きくすればよい。しかし、少なくとも噴出圧力差（（高圧側圧力−低圧側圧力）／低圧側圧力）が２０％以上でなければ、Ｃ反り抑制、及び振動低減効果は乏しい。一方、噴出圧力差を大きくし過ぎると、噴出圧力の低い面は鋼板１に供給されるＺｎイオンが少なくなり、めっき焼けを引き起こすので、噴出圧力差は６０％以下とするのがよい。めっき焼けが生じる条件は、電極の電流密度、鋼板のライン速度、めっき液の噴出速度によって異なるが、めっき液の噴出速度０．２ｍ／ｓ以上であれば、電気亜鉛めっき鋼板の製造ラインにおいて実用上、めっき焼けを引き起こさない。従って、噴出圧力が小さい方の噴出速度の下限値を確保した上で、上下面の噴出圧力差を大きくすれば、Ｃ反り抑制、及び振動低減効果が得られる。   In order to increase the effect of suppressing the C warpage of the steel plate 1 and reducing the vibration, the difference in the jet pressure between the upper and lower surfaces may be increased. However, unless at least the jet pressure difference ((high pressure side pressure−low pressure side pressure) / low pressure side pressure) is 20% or more, the C warpage suppression and vibration reduction effects are poor. On the other hand, if the jet pressure difference is increased too much, the surface having a low jet pressure reduces the amount of Zn ions supplied to the steel sheet 1 and causes plating burn. Therefore, the jet pressure difference is preferably 60% or less. The conditions under which plating burns occur vary depending on the current density of the electrode, the line speed of the steel sheet, and the spraying speed of the plating solution. However, if the spraying speed of the plating solution is 0.2 m / s or more, it is practical in the production line for electrogalvanized steel sheets. Above, does not cause plating burn. Therefore, if the lower limit value of the jet velocity with the smaller jet pressure is ensured and the jet pressure difference between the upper and lower surfaces is increased, C warpage suppression and vibration reduction effects can be obtained.

ノズルを多孔ノズルとする場合、前述の図１、図３、図５、図８の装置の使用し、該装置のノズルヘッダを鋼板走行方向に少なくとも３分割以上に分割し、前記のようにして、Ｃ反りを抑制し、及び振動を低減することができる。   When the nozzle is a perforated nozzle, use the apparatus shown in FIGS. 1, 3, 5, and 8 described above, and divide the nozzle header of the apparatus into at least three or more parts in the direction of travel of the steel plate, as described above. , C warpage can be suppressed and vibration can be reduced.

また、図１、図３、図５、図８の装置において、多孔ノズルの代わりに、スリットノズルを用いても同じ原理から同様のＣ反り矯正、及び振動低減効果が得られる。この場合、ノズルヘッダのスリット位置に対応する電極部分にスリット状の開口部を設ける。スリットノズルの場合は鋼板幅方向に均一な噴出が可能なため、特に鋼板の進行方向に対して角度をもたせる必要はない。但し、図８の装置では、電極のめっき液噴出用開口部の形状をスリット状とする。   Further, in the apparatus shown in FIGS. 1, 3, 5, and 8, the same C warpage correction and vibration reduction effects can be obtained from the same principle by using a slit nozzle instead of the porous nozzle. In this case, a slit-like opening is provided in the electrode portion corresponding to the slit position of the nozzle header. In the case of the slit nozzle, it is not necessary to provide an angle with respect to the traveling direction of the steel sheet because uniform ejection can be performed in the steel sheet width direction. However, in the apparatus of FIG. 8, the shape of the opening for spraying the plating solution of the electrode is a slit.

前述のめっき装置を備える電気めっきライン内に例えば蛍光Ｘ線等のめっき付着量計を設置し、このめっき付着量計により鋼板幅方向のめっき付着量を測定し、ノズルヘッダからのめっき噴出圧力差を変更して、鋼板の幅方向のめっき量分布を調整することができる。すなわち、鋼板のＣ反り等によって幅方向の付着量分布が大きい場合、付着量分布が均一になる量に、ノズルヘッダからのめっき液の噴出圧力を上下面で適正な差にすることが可能となる。ここで、鋼板幅方向のめっき付着量の測定は一つのセンサーを幅方向にスキャンさせてもよく、予め鋼板幅方向に並べて固定された複数個のセンサーで測定してもよい。また、表裏面同時に測定することが望ましいが、どちらか片面のみの測定でも非測定面側は測定面とは逆の付着量分布となることから、どちらか一方の面のみの測定からめっき液の噴出圧力の調整を行ってもよい。   A plating adhesion meter such as fluorescent X-rays is installed in the electroplating line equipped with the above-mentioned plating equipment, and the plating adhesion amount in the width direction of the steel sheet is measured by this plating adhesion meter, and the plating jet pressure difference from the nozzle header , And the distribution of the plating amount in the width direction of the steel sheet can be adjusted. That is, when the adhesion amount distribution in the width direction is large due to the C warp of the steel sheet, the spraying pressure of the plating solution from the nozzle header can be made an appropriate difference between the upper and lower surfaces so that the adhesion amount distribution becomes uniform. Become. Here, the measurement of the plating adhesion amount in the steel plate width direction may be performed by scanning one sensor in the width direction, or by using a plurality of sensors fixed in advance in the steel plate width direction. In addition, it is desirable to measure the front and back surfaces at the same time, but even if only one of the surfaces is measured, the non-measured surface has an adhesion distribution opposite to that of the measured surface. The ejection pressure may be adjusted.

鋼板の走行方向に複数の電極が配置されためっき装置にあっては、少なくとも１の電極に本発明のめっき装置を配し、本発明法を実施してもよい。これによって、当該セルで本発明の効果が奏される。なお、鋼板両面のめっき品質を同等にするには、鋼板の両面に多孔ノズルを配置することが望ましいが、片面のみに配置しても良い。   In a plating apparatus in which a plurality of electrodes are arranged in the traveling direction of a steel plate, the plating apparatus of the present invention may be arranged on at least one electrode to implement the method of the present invention. Thereby, the effect of the present invention is exhibited in the cell. In order to make the plating quality on both sides of the steel plate equal, it is desirable to arrange the porous nozzles on both sides of the steel plate, but it may be arranged only on one side.

以上の説明は鋼板が水平方向に走行する水平型めっきセルで亜鉛めっきする場合を説明したが、本発明の実施に使用するめっきセルの形式は水平型に限定されない。鋼板が垂直方向に走行する縦型めっきセルであってもよい。また、めっき種も亜鉛めっきに限定されない。   Although the above description explained the case where galvanizing was performed in a horizontal plating cell in which a steel plate travels in the horizontal direction, the type of the plating cell used for carrying out the present invention is not limited to the horizontal type. It may be a vertical plating cell in which the steel plate travels in the vertical direction. Also, the plating type is not limited to galvanizing.

以下、この発明の実施例について、従来法と比較して説明する。   Examples of the present invention will be described below in comparison with conventional methods.

（本発明例１）
図８に示しためっき装置を備える電気亜鉛めっき鋼板の製造ラインを用い、板厚０．８ｍｍ、板幅１２００ｍｍの鋼板にＺｎＳＯ4を含む硫酸浴を用い、連続して走行する鋼板に電気亜鉛めっきを施した。 (Invention Example 1)
Using the electrogalvanized steel plate production line equipped with the plating apparatus shown in FIG. 8, a steel plate having a plate thickness of 0.8 mm and a plate width of 1200 mm using a sulfuric acid bath containing ZnSO 4 , and continuously running the steel plate Was given.

電極７とノズルヘッダ６を一体化して、電極７に設けためっき液噴出口９よりめっき液を多孔部から鋼板に垂直に噴射した。図２に示すように、各めっき液噴出口９は鋼板の進行方向に対して角度をもたせた配列にした千鳥配置とし、電極７に設けためっき液噴出口９の直径をφ２ｍｍ、各めっき液出射口９の中心間隔Ｌdを２８ｍｍとした。電極長は１ｍ、電極厚さは３０ｍｍである。電極７と鋼板１間の距離を１０ｍｍとした。鋼板のライン速度は２００ｍｐｍとし、めっきヤケが発生するまで電流値を段階的に調整し、本発明例の効果は、限界電流密度値の測定およびめっき時の抵抗を算出することにより評価を行った。尚、ノズルヘッダの噴流圧力を調整し、１つのめっきセルのノズルヘッダからの噴流量を上下面合わせて３００ｍ3／ｈｒとした。 The electrode 7 and the nozzle header 6 were integrated, and the plating solution was sprayed vertically from the porous portion to the steel plate from the plating solution outlet 9 provided in the electrode 7. As shown in FIG. 2, the plating solution jets 9 are arranged in a staggered arrangement with an angle with respect to the traveling direction of the steel plate, the diameter of the plating solution jets 9 provided on the electrode 7 is 2 mm, and each plating solution the center distance L d of the exit port 9 was 28mm. The electrode length is 1 m, and the electrode thickness is 30 mm. The distance between the electrode 7 and the steel plate 1 was 10 mm. The line speed of the steel sheet was set to 200 mpm, and the current value was adjusted stepwise until plating burn occurred, and the effect of the example of the present invention was evaluated by measuring the limit current density value and calculating the resistance during plating. . In addition, the jet flow pressure of the nozzle header was adjusted, and the jet flow rate from the nozzle header of one plating cell was set to 300 m 3 / hr in the vertical direction.

（本発明例２）
図３に示した電気めっき設備を備える電気亜鉛めっき鋼板の製造ラインを用い、板厚０．８ｍｍ、板幅１２００ｍｍの鋼板にＺｎＳＯ4を含む硫酸浴を用い、連続して走行する鋼板に電気亜鉛めっきを施した。 (Invention Example 2)
Using the electrogalvanized steel plate production line equipped with the electroplating equipment shown in FIG. 3, a steel plate having a plate thickness of 0.8 mm and a plate width of 1200 mm, using a sulfuric acid bath containing ZnSO 4 , and continuously running on the steel plate Plating was applied.

図２に示すように、ノズルヘッダ６の各ノズル８ａ、及び電極７の各小孔９は鋼板の進行方向に対して角度をもたせた配列にした千鳥配置とした。電極７に設けた小孔９の直径をφ６ｍｍ、ノズルヘッダ６に電極７の各小孔９の中心位置と一致する位置にノズル８ａを設け、そのノズル８ａの外径をφ４ｍｍ、内径をφ２ｍｍとし、各ノズル８ａ及び小孔９の中心間隔Ｌdを２８ｍｍとした。電極長は１ｍ、電極厚さは３０ｍｍである。電極７とノズルヘッダ６間の距離を１０ｍｍ、電極と鋼板間の距離を１０ｍｍとし、また、ノズル先端と鋼板の距離を１０ｍｍとした。 As shown in FIG. 2, each nozzle 8a of the nozzle header 6 and each small hole 9 of the electrode 7 are arranged in a staggered arrangement with an angle with respect to the traveling direction of the steel plate. The diameter of the small hole 9 provided in the electrode 7 is φ6 mm, the nozzle header 6 is provided with a nozzle 8a at a position corresponding to the center position of each small hole 9 of the electrode 7, the outer diameter of the nozzle 8a is φ4 mm, and the inner diameter is φ2 mm. the center distance L d of the nozzles 8a and small holes 9 was 28mm. The electrode length is 1 m, and the electrode thickness is 30 mm. The distance between the electrode 7 and the nozzle header 6 was 10 mm, the distance between the electrode and the steel plate was 10 mm, and the distance between the nozzle tip and the steel plate was 10 mm.

めっき液は、ポンプ（図示なし）よりノズルヘッダ６に供給し、ノズル８ａより鋼板面に垂直に噴射した。被めっき面（鋼板面）からの戻り液は、各ノズル８ａと電極７に設けた小孔９の隙間を流動し、さらに電極７とノズルヘッダ６との隙間を流れ、めっき部より外へ逃がした。鋼板のライン速度は２００ｍｐｍとし、めっきヤケが発生するまで電流値を段階的に調整し、限界電流密度とめっき時の抵抗を評価した。尚、ノズルヘッダの噴流圧力を調整し、１つのめっきセルのノズルヘッダからの噴流量を上下面合わせて３００ｍ3／ｈｒとした。 The plating solution was supplied to the nozzle header 6 from a pump (not shown) and sprayed perpendicularly to the steel plate surface from the nozzle 8a. The return liquid from the surface to be plated (steel plate surface) flows through the gaps between the small holes 9 provided in the respective nozzles 8a and the electrodes 7, and further flows through the gaps between the electrodes 7 and the nozzle header 6 to escape from the plating part. It was. The line speed of the steel sheet was set to 200 mpm, and the current value was adjusted stepwise until plating burn occurred, and the critical current density and the resistance during plating were evaluated. In addition, the jet flow pressure of the nozzle header was adjusted, and the jet flow rate from the nozzle header of one plating cell was set to 300 m 3 / hr in the vertical direction.

（本発明例３）
図５に示した電気めっき設備を備える電気亜鉛めっき鋼板の製造ラインを用い、板厚０．８ｍｍ、板幅１２００ｍｍの鋼板にＺｎＳＯ4を含む硫酸浴を用い、連続して走行する鋼板に電気亜鉛めっきを施した。 (Invention Example 3)
Using the electrogalvanized steel plate production line equipped with the electroplating equipment shown in FIG. 5, a steel plate having a plate thickness of 0.8 mm and a plate width of 1200 mm, using a sulfuric acid bath containing ZnSO 4 , and continuously running on the steel plate Plating was applied.

図２に示すように、ノズルヘッダ６の各ノズル８ａと電極の小孔９は鋼板の進行方向に対して角度をもたせた配列にした千鳥配置とした。電極７に設けた小孔９の直径をφ６ｍｍ、ノズルヘッダ６に電極７の各小孔９の中心位置と一致する位置にノズルヘッダ６から突出したノズル８ａを設け、そのノズル８ａの外径をφ４ｍｍ、内径をφ２ｍｍとし、各ノズル８ａの液噴出口の中心間隔、電極の小孔９の中心間隔Ｌｄを２８ｍｍとした。電極７に設けた戻り液排出用の孔１１は直径をφ１ｍｍとした。図６に示すように、孔１１は、電極７の隣り合う小孔９同士の中間位置に配置した。孔１１は小孔９の周りに６個配置されている。電極長は１ｍ、電極厚さは３０ｍｍである。電極とノズルヘッダ間の距離を１０ｍｍとし、電極と鋼板間の距離を１０ｍｍとした。   As shown in FIG. 2, the nozzles 8a of the nozzle header 6 and the small holes 9 of the electrode are arranged in a staggered arrangement with an angle with respect to the traveling direction of the steel plate. The diameter of the small hole 9 provided in the electrode 7 is 6 mm, and the nozzle header 6 is provided with a nozzle 8a protruding from the nozzle header 6 at a position that coincides with the center position of each small hole 9 of the electrode 7, and the outer diameter of the nozzle 8a is The diameter was 4 mm, the inner diameter was 2 mm, the center distance between the liquid jets of each nozzle 8a, and the center distance Ld between the small holes 9 in the electrode was 28 mm. The return liquid discharge hole 11 provided in the electrode 7 has a diameter of 1 mm. As shown in FIG. 6, the hole 11 was disposed at an intermediate position between the adjacent small holes 9 of the electrode 7. Six holes 11 are arranged around the small hole 9. The electrode length is 1 m, and the electrode thickness is 30 mm. The distance between the electrode and the nozzle header was 10 mm, and the distance between the electrode and the steel plate was 10 mm.

めっき液は、ポンプ（図示なし）よりノズルヘッダ６に供給し、ノズル８ａより鋼板面に垂直に噴射した。被めっき面（鋼板）からの戻り液は、各ノズル８ａと電極７に設けた小孔９の隙間部分および、電極７に設けた戻り液排出孔のための孔１１を流動して電極とノズルヘッダとの隙間部分に排出することで、めっき部より外へ逃がした。   The plating solution was supplied to the nozzle header 6 from a pump (not shown) and sprayed perpendicularly to the steel plate surface from the nozzle 8a. The return liquid from the surface to be plated (steel plate) flows through the gaps between the small holes 9 provided in the nozzles 8a and the electrodes 7 and the holes 11 for the return liquid discharge holes provided in the electrodes 7 to flow through the electrodes and nozzles. By discharging to the gap with the header, it escaped from the plated part.

鋼板のライン速度は２００ｍｐｍとし、めっきヤケが発生するまで電流値を段階的に調整し、限界電流密度とめっき時の抵抗を評価した。尚、ノズルヘッダの噴流圧力を調整し、１つのめっきセルのノズルヘッダからの噴流量を上下面合わせて３００ｍ3／ｈｒとした。 The line speed of the steel sheet was set to 200 mpm, and the current value was adjusted stepwise until plating burn occurred, and the critical current density and the resistance during plating were evaluated. In addition, the jet flow pressure of the nozzle header was adjusted, and the jet flow rate from the nozzle header of one plating cell was set to 300 m 3 / hr in the vertical direction.

（本発明例４）
図３に示した電気めっき設備を備える電気亜鉛めっき鋼板の製造ラインを用い、板厚０．８ｍｍ、板幅１２００ｍｍの鋼板にＺｎＳＯ4を含む硫酸浴を用い、連続して走行する鋼板に電気亜鉛めっきを施した。 (Invention Example 4)
Using the electrogalvanized steel plate production line equipped with the electroplating equipment shown in FIG. 3, a steel plate having a plate thickness of 0.8 mm and a plate width of 1200 mm, using a sulfuric acid bath containing ZnSO 4 , and continuously running on the steel plate Plating was applied.

図２に示すように、ノズルヘッダ６の各ノズル８ａ、及び電極の各小孔９は鋼板の進行方向に対して角度をもたせた配列にした千鳥配置とした。電極７に設けた小孔９の直径をφ６ｍｍ、ノズルヘッダ６に電極７の各小孔９の中心位置と一致する位置にノズル８ａを設け、そのノズル８ａの外径をφ４ｍｍ、内径をφ２ｍｍとし、各ノズル８ａの液噴出口の中心間隔Ｌdを２８ｍｍとした。電極長は１ｍ、電極厚さは３０ｍｍである。電極とノズルヘッダ間の距離を１０ｍｍ、電極と鋼板間の距離を１０ｍｍとし、また、ノズル先端と鋼板の距離を８ｍｍとした。 As shown in FIG. 2, each nozzle 8a of the nozzle header 6 and each small hole 9 of the electrode are arranged in a staggered arrangement with an angle with respect to the traveling direction of the steel plate. The diameter of the small hole 9 provided in the electrode 7 is φ6 mm, the nozzle header 6 is provided with a nozzle 8a at a position corresponding to the center position of each small hole 9 of the electrode 7, the outer diameter of the nozzle 8a is φ4 mm, and the inner diameter is φ2 mm. the center distance L d of the liquid ejection ports of the nozzles 8a was 28mm. The electrode length is 1 m, and the electrode thickness is 30 mm. The distance between the electrode and the nozzle header was 10 mm, the distance between the electrode and the steel plate was 10 mm, and the distance between the nozzle tip and the steel plate was 8 mm.

めっき液は、ポンプよりノズルヘッダに供給し、ノズルより鋼板面に垂直に噴射した。被めっき面からの戻り液は、各ノズルと電極に設けた多孔の隙間を流動し、さらに電極とノズルヘッダとの隙間を流れ、めっき部より外へ逃がした。   The plating solution was supplied from a pump to the nozzle header and sprayed perpendicularly to the steel plate surface from the nozzle. The return liquid from the surface to be plated flows through the porous gaps provided in the nozzles and the electrodes, further flows through the gaps between the electrodes and the nozzle header, and escapes from the plating part.

鋼板のライン速度は２００ｍｐｍとし、めっきヤケが発生するまで電流値を段階的に調整し、限界電流密度とめっき時の抵抗を評価した。尚、ノズルヘッダの噴流圧力を調整し、１つのめっきセルのノズルヘッダからの噴流量を上下面合わせて３００ｍ3／ｈｒとした。 The line speed of the steel sheet was set to 200 mpm, and the current value was adjusted stepwise until plating burn occurred, and the critical current density and the resistance during plating were evaluated. In addition, the jet flow pressure of the nozzle header was adjusted, and the jet flow rate from the nozzle header of one plating cell was set to 300 m 3 / hr in the vertical direction.

前記各本発明例で得られた限界電流密度、及びめっき時の抵抗の評価結果を表１に記載する。評価は、電極長１ｍの電極で、電極と鋼板間の距離を１０ｍｍとして、鋼板面に対して水平方向にめっき液を上下面合わせて３００ｍ3／ｈｒで噴射してめっきしたとき（従来例）の限界電流密度、及びめっき時の抵抗値と比較し、従来例を基準として、それに対する比で評価した。 Table 1 shows the evaluation results of the limiting current density obtained in each of the inventive examples and the resistance during plating. Evaluation is performed when an electrode having an electrode length of 1 m is used, and the distance between the electrode and the steel plate is 10 mm, and plating is performed by spraying the plating solution at 300 m 3 / hr in the horizontal direction with respect to the steel plate surface (conventional example). Was compared with the resistance value at the time of plating and the resistance value at the time of plating.

Figure 0004586423
Figure 0004586423

表１から明らかなように、鋼板にほぼ垂直にめっき液を噴射してめっきを行う本発明例は、鋼板面に水平方向にめっき液を噴射する従来例と比べ、限界電流密度を向上させることが可能となる。また、めっき面からの戻り液を逃げやすくするほど限界電流密度を高めることができる。これは、本発明例は、従来例に比べて、Ｚｎイオンの供給効率が上昇すると同時に、気泡の除去効果が向上することで、セル内の電流密度分布が悪化し、局所的に電流集中が生じ限界電流密度を越えめっきヤケを生じることが防止されるためである。また、本発明例では、被めっき面からの戻り液の逃げ部を設けることにより、気泡に起因する抵抗分を低減でき、全体の抵抗電圧を低減させることが可能となる。   As is apparent from Table 1, the present invention example in which plating is performed by spraying a plating solution substantially perpendicularly to the steel sheet improves the limit current density compared to the conventional example in which the plating solution is sprayed horizontally on the steel sheet surface. Is possible. In addition, the limit current density can be increased as the return liquid from the plating surface becomes easier to escape. This is because the example of the present invention increases the supply efficiency of Zn ions and improves the bubble removal effect at the same time as the conventional example, thereby degrading the current density distribution in the cell and causing local current concentration. This is because it is possible to prevent the occurrence of plating burn over the limit current density. Further, in the present invention example, by providing the escape portion of the return liquid from the surface to be plated, the resistance due to the bubbles can be reduced, and the overall resistance voltage can be reduced.

さらに、本発明例３と本発明例４を比較すると、ノズル８ａ先端を鋼板１に近づけると、ノズル８ａが電極７〜鋼板１間の電流分布を乱し抵抗電圧を上昇させ、一方で、Ｚｎイオンの供給効率が上昇すると同時に、気泡の除去効果が高まるために高限界電流密度でのめっきが可能となることがわかる。これは、ノズル８ａ先端が鋼板１から離れていると、図１１（ｂ）に示すように、ノズル８ａから噴射されるめっき液と鋼板１からの戻り液による逆方向の流れが干渉して図中の破線領域で抵抗摩擦力が増加するのに対して、ノズル８ａ先端が鋼板１に近づくと、図１１（ａ）に示すように、ノズル８ａから噴射されるめっき液と鋼板１からの戻り液による逆方向の流れの干渉が防止され、抵抗摩擦力が減少し、ノズル８ａからのめっき液の供給、および鋼板１からの戻り液の流れがスムーズになるためである。   Further, comparing Invention Example 3 and Invention Example 4, when the tip of the nozzle 8a is brought closer to the steel plate 1, the nozzle 8a disturbs the current distribution between the electrode 7 and the steel plate 1 and increases the resistance voltage, while Zn It can be seen that, at the same time as the ion supply efficiency is increased, the effect of removing bubbles is increased, so that plating at a high limit current density is possible. This is because when the tip of the nozzle 8a is separated from the steel plate 1, the reverse flow caused by the plating solution sprayed from the nozzle 8a and the return solution from the steel plate 1 interferes as shown in FIG. When the tip of the nozzle 8a approaches the steel plate 1 while the resistance friction force increases in the broken line area in the middle, as shown in FIG. 11A, the plating solution sprayed from the nozzle 8a and the return from the steel plate 1 This is because the interference of the flow in the reverse direction due to the liquid is prevented, the resistance frictional force is reduced, and the supply of the plating liquid from the nozzle 8a and the flow of the return liquid from the steel plate 1 become smooth.

図１０に示しためっき装置を備える電気亜鉛めっきラインで、板厚０．８ｍｍ、板幅１２００ｍｍの鋼板にＺｎＳＯ4を含む硫酸浴を用い、連続して走行する鋼板に電気亜鉛めっきを施した。ここで、一セル内のノズルヘッダは上下面とも均等に４分割した。ノズルヘッダ６の小孔８と電極の小孔９は、図２に示すように、鋼板の進行方向に対して角度をもたせた配列にした千鳥配置とした。ノズルヘッダ６の小孔８の直径をφ２ｍｍ、各小孔の中心間隔を２８ｍｍとした。また、電極７の小孔９の直径をφ４ｍｍ、各小孔の中心間隔を同じく２８ｍｍとした。ノズルヘッダ６の小孔８の中心位置と電極７の小孔９の中心位置は同じ位置としている。電極７とノズルヘッダ６間の距離を５ｍｍ、電極７と鋼板１間の距離を１０ｍｍとした。鋼板１のライン速度は２００ｍｐｍとし、亜鉛めっき付着量が２０ｇ／ｍ2を確保できるように、電流値を調整した。ノズルヘッダ６の噴出圧力を調整し、分割した一つのノズルヘッダからの噴出量を上下面で各々３００ｍ3／ｈｒと１５０ｍ3／ｈｒとした。ここで、鋼板のＣ反り抑制効果の確認は、鋼板幅方向の付着量分布の標準偏差を指標とした。また、鋼板の振動低減効果の確認は、鋼板が電極に接触するスパークの発生有無を指標とした。比較として、従来技術のめっき液を鋼板の進行方向に対向する方向で鋼板に平行に噴出する対向水平噴出めっきセルを用いた場合も同様に実施した。 In the electrogalvanizing line equipped with the plating apparatus shown in FIG. 10, a steel plate having a plate thickness of 0.8 mm and a plate width of 1200 mm was subjected to electrogalvanizing on a continuously running steel plate using a sulfuric acid bath containing ZnSO 4 . Here, the nozzle header in one cell was equally divided into four on both the upper and lower surfaces. As shown in FIG. 2, the small holes 8 of the nozzle header 6 and the small holes 9 of the electrode are arranged in a staggered arrangement with an angle with respect to the traveling direction of the steel plate. The diameter of the small holes 8 of the nozzle header 6 was 2 mm, and the center interval between the small holes was 28 mm. The diameter of the small holes 9 of the electrode 7 was 4 mm, and the center interval between the small holes was also 28 mm. The center position of the small hole 8 of the nozzle header 6 and the center position of the small hole 9 of the electrode 7 are the same position. The distance between the electrode 7 and the nozzle header 6 was 5 mm, and the distance between the electrode 7 and the steel plate 1 was 10 mm. The line speed of the steel plate 1 was 200 mpm, and the current value was adjusted so that the amount of galvanized adhesion could be secured to 20 g / m 2 . Adjust the ejection pressure of the nozzle header 6, the jetting amount of the divided one nozzle header and with each 300 meters 3 / hr and 150 meters 3 / hr in the upper and lower surfaces. Here, the confirmation of the C warpage suppressing effect of the steel sheet was performed using the standard deviation of the adhesion amount distribution in the width direction of the steel sheet as an index. In addition, the confirmation of the vibration reduction effect of the steel sheet was based on the presence or absence of the occurrence of sparks where the steel sheet contacts the electrode. For comparison, the same practice was performed when using a counter horizontal spray plating cell in which the plating solution of the prior art was sprayed in parallel to the steel sheet in a direction opposite to the traveling direction of the steel sheet.

その結果、本発明法の幅方向めっき付着量の標準偏差は１．２ｇ／ｍ2だったのに対し、従来法では２．３ｇ／ｍ2であった。また、スパークの発生有無は、本発明法では発生がなかったのに対し、従来法ではスパークが発生した。従って、従来法では、電極と鋼板間の距離を１０ｍｍで製造を行うことが困難となり、１５ｍｍに広げざるを得なかった。 As a result, the standard deviation of the coating amount in the width direction in the method of the present invention was 1.2 g / m 2 , whereas it was 2.3 g / m 2 in the conventional method. In addition, the occurrence of sparks did not occur in the method of the present invention, whereas sparks occurred in the conventional method. Therefore, in the conventional method, it is difficult to manufacture with the distance between the electrode and the steel plate being 10 mm, and it has to be expanded to 15 mm.

本実施例２によれば、鋼板上下面で噴出圧力差を設けためっき液噴出を鋼板に対して垂直に行い、鋼板進行方向に上下面の圧力バランスを順次逆転させることにより、鋼板のＣ反り低減を行うことができる。従って、鋼板幅方向のめっき付着量分布が改善できるとともに、鋼板のＣ反り低減と振動抑制により、めっきセル内の鋼板が安定化したために、鋼板と電極の間隔を短縮化することができた。   According to the second embodiment, the plating solution is ejected perpendicularly to the steel plate with a jet pressure difference between the upper and lower surfaces of the steel plate, and the pressure balance of the upper and lower surfaces is sequentially reversed in the steel plate traveling direction, thereby causing C warpage of the steel plate. Reduction can be performed. Therefore, the plating adhesion distribution in the steel plate width direction can be improved, and the steel plate in the plating cell is stabilized by reducing the C warpage and suppressing the vibration of the steel plate, so that the distance between the steel plate and the electrode can be shortened.

本実施例３は、図２に示したノズルヘッダとノズルヘッダの小孔に合わせた多孔電極を用いて、実施例２と同様にしてめっきを行い、めっき焼けを引き起こさない限界電流密度を調べた。また、多孔ノズルの代わりに鋼板幅方向にスリットを設けたスリットノズルを用い、同様にしてめっき焼けを引き起こさない限界電流密度を調べた。また、比較として、従来技術のめっき液を鋼板の進行方向に対向する方向で鋼板に平行に噴出する対向水平噴出めっきセルを用いた場合について同様の調査を行った。   In Example 3, plating was performed in the same manner as in Example 2 using the nozzle header shown in FIG. 2 and the porous electrode matched to the small holes of the nozzle header, and the limit current density that did not cause plating burn was examined. . In addition, a slit nozzle having slits in the width direction of the steel sheet was used instead of the porous nozzle, and the limit current density that did not cause plating burn was examined in the same manner. For comparison, the same investigation was performed for the case of using an opposed horizontal spray plating cell in which the plating solution of the prior art was ejected in parallel to the steel sheet in a direction opposite to the traveling direction of the steel sheet.

限界電流密度は、ライン速度とめっき液の流速で異なるが、同条件で比較すると、いずれの条件下でも水平対向噴出ノズルを用いた従来法に比較して、多孔ノズルを用いた本発明法の方が約１．５倍の限界電流密度が達成できた。また多孔ノズルの代わりにスリットノズルを用いた場合は、従来の水平対向噴出ノズルを用いた従来法と比較して、本発明法の方が約１．２倍の限界電流密度が達成できた。   Although the limiting current density differs depending on the line speed and the plating solution flow rate, when compared under the same conditions, the method of the present invention using the porous nozzle compared to the conventional method using the horizontally opposed jet nozzle under any condition. The limit current density of about 1.5 times was achieved. Further, when a slit nozzle was used instead of the perforated nozzle, the limit current density of the present invention was about 1.2 times that of the conventional method using the conventional horizontally opposed jet nozzle.

このように、本実施例３によれば、限界電流密度が向上するため、より大電流を流し、めっきを付着させる速度も速くなるので、ライン速度の高速化も可能となる。   As described above, according to the third embodiment, the limit current density is improved, so that a higher current is supplied and the rate of depositing the plating is increased, so that the line speed can be increased.

本実施例４は、図１２に示した電気亜鉛めっき鋼板の製造ラインを用い、板厚０．８ｍｍ、板幅１２００ｍｍの鋼板にＺｎＳＯ4を含む硫酸浴を用い、連続して走行する鋼板に電気亜鉛めっきを施した。また、一セル内のノズルヘッダは上下面とも均等に４分割した。ノズルヘッダ６の小孔８と電極７の小孔９は、図２に示すように、鋼板の進行方向に対して角度をもたせた配列にした千鳥配置とした。小孔８の直径をφ２ｍｍ、各孔の中心間隔を２８ｍｍとした。また、電極７の小孔９の直径をφ４ｍｍ、各小孔の中心間隔を同じく２８ｍｍとした。ノズルヘッダ６の小孔８の中心位置と電極７の小孔９の中心位置は同じ位置としている。電極とノズルヘッダ間の距離を５ｍｍ、電極と鋼板間の距離を１０ｍｍとした。鋼板のライン速度は２００ｍｐｍとし、亜鉛めっき付着量が２０ｇ／ｍ2を確保できるように、電流値を調整した。 This Example 4 uses the electrogalvanized steel plate production line shown in FIG. 12 and uses a sulfuric acid bath containing ZnSO 4 on a steel plate having a plate thickness of 0.8 mm and a plate width of 1200 mm. Zinc plating was applied. Moreover, the nozzle header in one cell was equally divided into four on the upper and lower surfaces. As shown in FIG. 2, the small holes 8 of the nozzle header 6 and the small holes 9 of the electrode 7 are arranged in a staggered arrangement with an angle with respect to the traveling direction of the steel plate. The diameter of the small holes 8 was 2 mm, and the center distance between the holes was 28 mm. The diameter of the small holes 9 of the electrode 7 was 4 mm, and the center interval between the small holes was also 28 mm. The center position of the small hole 8 of the nozzle header 6 and the center position of the small hole 9 of the electrode 7 are the same position. The distance between the electrode and the nozzle header was 5 mm, and the distance between the electrode and the steel plate was 10 mm. The line speed of the steel sheet was set to 200 mpm, and the current value was adjusted so that the amount of galvanized adhesion was 20 g / m 2 .

全めっきセルの下流側に設置した蛍光Ｘ線を用いた付着量計１０により、鋼板幅方向の亜鉛めっきの付着量を測定する。付着量計１０は鋼板の幅方向にスキャンできる構造になっており、全幅の付着量分布を測定することが可能である。この付着量計１０により測定された亜鉛めっきの付着量分布に応じて、最も付着量分布が均一になるように、手動により各ノズルヘッダの圧力を調整した。その結果、鋼板幅方向の付着量分布の標準偏差が、何も制御しない場合は、１．２ｇ／ｍ2だったのに対し、適正な圧力調整を実施した場合は０．６ｇ／ｍ2と小さくなり、より均一なめっき付着量を得ることができ、めっき付着量の管理範囲下限値狙いの操業を行い、亜鉛原単位の低減が可能になった。 The adhesion amount of galvanization in the width direction of the steel sheet is measured by an adhesion amount meter 10 using fluorescent X-rays installed on the downstream side of all plating cells. The adhesion amount meter 10 has a structure capable of scanning in the width direction of the steel sheet, and can measure the adhesion amount distribution of the entire width. Depending on the coating weight distribution of the measured galvanized by the coating weight meter 10, as best adhesion amount distribution is uniform and adjusted more pressure in each nozzle header manually. As a result, the standard deviation of the adhesion amount distribution in the width direction of the steel sheet was 1.2 g / m 2 when nothing was controlled, but 0.6 g / m 2 when proper pressure adjustment was performed. It became smaller and more uniform plating deposits could be obtained, and operation aimed at the lower limit of the control range of plating deposits was carried out, making it possible to reduce the basic unit of zinc.

本発明の方法は、めっきセル内でＺｎイオンなどの供給を効率的に行い、めっき時に発生する気泡の逃げをスムーズに行うことにより、低電圧操業および／または高電流密度めっきが可能となる電気めっき鋼板の製造方法として利用することができる。   The method of the present invention efficiently supplies Zn ions and the like in a plating cell, and smoothly discharges bubbles generated during plating, thereby enabling low voltage operation and / or high current density plating. It can utilize as a manufacturing method of a plated steel plate.

また、本発明の方法は、めっきセル内でのＣ反りを抑制しまた振動を低減することで、鋼板と電極間距離を狭めて、低電圧操業および／または高電流密度めっきが可能となる電気めっき鋼板の製造方法として利用することができる。   In addition, the method of the present invention suppresses C warpage in the plating cell and reduces vibration, thereby reducing the distance between the steel plate and the electrode, thereby enabling low voltage operation and / or high current density plating. It can utilize as a manufacturing method of a plated steel plate.

本発明の装置は、前述の電気めっき鋼板を製造するための装置として利用することができる。   The apparatus of this invention can be utilized as an apparatus for manufacturing the above-mentioned electroplated steel sheet.

本発明の実施の形態に係るめっき装置の第１の実施形態の要部構成例を示す概略断面図である。It is a schematic sectional drawing which shows the principal part structural example of 1st Embodiment of the plating apparatus which concerns on embodiment of this invention. 本発明のめっき装置に配置するノズルヘッダのめっき液噴出口及び／または電極の貫通孔の配置状態の一例を説明する概略平面図である。It is a schematic plan view explaining an example of the arrangement | positioning state of the plating liquid jet nozzle of the nozzle header arrange | positioned in the plating apparatus of this invention, and / or the through-hole of an electrode. 本発明の実施の形態に係るめっき装置の第２の実施形態の要部構成例を示す概略断面図である。It is a schematic sectional drawing which shows the principal part structural example of 2nd Embodiment of the plating apparatus which concerns on embodiment of this invention. 図３のめっき装置におけるめっき液の流れを説明する図である。It is a figure explaining the flow of the plating solution in the plating apparatus of FIG. 本発明の実施の形態に係るめっき装置の第３の実施の形態の要部構成例を示す概略断面図である。It is a schematic sectional drawing which shows the principal part structural example of 3rd Embodiment of the plating apparatus which concerns on embodiment of this invention. 本発明のめっき装置に使用するに電極に配置される貫通孔とめっき液排出口の配置状態の一例を説明する概略平面図である。It is a schematic plan view explaining an example of the arrangement | positioning state of the through-hole arrange | positioned at an electrode when using it for the plating apparatus of this invention, and a plating solution discharge port. 図５のめっき装置におけるめっき液の流れを説明する図である。It is a figure explaining the flow of the plating solution in the plating apparatus of FIG. 本発明の実施の形態に係るめっき装置の第４の実施形態の要部構成例を示す概略断面図である。It is a schematic sectional drawing which shows the principal part structural example of 4th Embodiment of the plating apparatus which concerns on embodiment of this invention. 図８のめっき装置に配置される電極にめっき液排出孔を設ける場合のめっき設備の構成例を説明する図である。It is a figure explaining the structural example of the plating equipment in the case of providing a plating solution discharge hole in the electrode arrange | positioned at the plating apparatus of FIG. 本発明の実施の形態に係るめっき装置の第５の実施形態の要部構成例を示す概略断面図である。It is a schematic sectional drawing which shows the principal part structural example of 5th Embodiment of the plating apparatus which concerns on embodiment of this invention. 本発明のめっき装置において、ノズル（めっき液噴出用噴出管）と鋼板の距離の違いによるめっき液流れの差を説明する図で、（ａ）は鋼板とノズルの距離が近い場合、（ｂ）は鋼板とノズルの距離が遠い場合の各めっき液の流れを説明する。In the plating apparatus of this invention, it is a figure explaining the difference of the plating solution flow by the difference of the distance of a nozzle (spouting pipe for plating solution ejection) and a steel plate, (a) When the distance of a steel plate and a nozzle is near, (b) Explains the flow of each plating solution when the distance between the steel plate and the nozzle is long. 本発明の実施例４で用いた電気めっき鋼板の製造ラインの要部を説明する概略図である。It is the schematic explaining the principal part of the manufacturing line of the electroplating steel plate used in Example 4 of this invention.

符号の説明Explanation of symbols

１ 鋼板
２ コンダクターロール
３ バックアップロール
４ めっき液
５ ダムロール
６ ノズルヘッダ
７ 電極
８ 孔（めっき液噴出口）
８ａ ノズル（めっき液噴出管）
９ 孔（めっき液噴出口、貫通孔）
１０ 付着量計
１１ 孔（めっき液排出口）
１２ ダクト
１３ めっき液の流れ 1 Steel Plate 2 Conductor Roll 3 Backup Roll 4 Plating Solution 5 Dam Roll 6 Nozzle Header 7 Electrode 8 Hole (Plating Solution Spout)
8a Nozzle (Plating solution ejection pipe)
9 holes (plating solution outlet, through hole)
10 Adhesion meter 11 Hole (Plating solution outlet)
12 Duct 13 Flow of plating solution

Claims (13)

連続的に走行する鋼板の両面側に鋼板を挟むように各々相対して配置した電極と、前記鋼板に通電するコンダクターロールと、前記鋼板の両面側に各々配置されて鋼板面にめっき液を噴射するためのノズルヘッダを有しためっき装置を用いて電気めっき鋼板を製造する方法において、
複数のめっき液噴出口を設けたノズルヘッダを電極の背面に前記電極と間隔をあけて配置するとともに、前記電極の前記ノズルヘッダの各めっき液噴出口に対応する位置に、前記ノズルヘッダからのめっき液を鋼板−電極間に案内するための貫通孔を前記電極を貫通して設け、前記ノズルヘッダの前記複数のめっき液噴出口からめっき液を噴射して鋼板に対してほぼ垂直方向に衝突させてめっきするとともに、前記ノズルヘッダを鋼板の走行方向に対して少なくとも３区画以上に分割し、鋼板の上下面の対向する区画のノズルヘッダの噴出圧力を異なるようにするとともに、鋼板の上下面の対向する区画のノズルヘッダの噴出圧力の大小関係を上流側から下流側にかけて順次逆転させることを特徴とする電気めっき鋼板の製造方法。 Electrodes arranged opposite to each other so that the steel plates are sandwiched between both sides of the continuously running steel plate, a conductor roll for energizing the steel plates, and a plating solution that is arranged on both sides of the steel plates and sprays the plating solution onto the steel plate surfaces. In a method of manufacturing an electroplated steel sheet using a plating apparatus having a nozzle header for
A nozzle header provided with a plurality of plating solution spouts is disposed on the back surface of the electrode at a distance from the electrode, and at a position corresponding to each plating solution spout of the nozzle header of the electrode, from the nozzle header A through hole for guiding the plating solution between the steel plate and the electrode is provided through the electrode, and the plating solution is injected from the plurality of plating solution outlets of the nozzle header to collide with the steel plate in a substantially vertical direction. And the nozzle header is divided into at least three sections with respect to the traveling direction of the steel sheet so that the jetting pressures of the nozzle headers in the opposing sections of the steel sheet are different, and the upper and lower surfaces of the steel sheet A method for producing an electroplated steel sheet, wherein the magnitude relationship of the ejection pressure of the nozzle headers in the opposing sections is sequentially reversed from the upstream side to the downstream side . 連続的に走行する鋼板の両面側に鋼板を挟むように各々相対して配置した電極と、前記鋼板に通電するコンダクターロールと、前記鋼板の両面側に各々配置されて鋼板面にめっき液を噴射するためのノズルヘッダを有しためっき装置を用いて電気めっき鋼板を製造する方法において、
前記ノズルヘッダを前記電極の背面に前記電極と間隔をあけて配置し、前記ノズルヘッダに前記ノズルヘッダから突出して形成した複数のめっき液噴出管を設けるとともに、前記電極の前記ノズルヘッダの各めっき液噴出管に対応する位置に、前記ノズルヘッダからのめっき液を鋼板−電極間に案内するための貫通孔を前記電極を貫通して設け、前記ノズルヘッダの前記複数のめっき液噴出管からめっき液を噴射して鋼板に対してほぼ垂直方向に衝突させてめっきするとともに、前記ノズルヘッダを鋼板の走行方向に対して少なくとも３区画以上に分割し、鋼板の上下面の対向する区画のノズルヘッダの噴出圧力を異なるようにするとともに、鋼板の上下面の対向する区画のノズルヘッダの噴出圧力の大小関係を上流側から下流側にかけて順次逆転させることを特徴とする電気めっき鋼板の製造方法。 Electrodes arranged opposite to each other so that the steel plates are sandwiched between both sides of the continuously running steel plate, a conductor roll for energizing the steel plates, and a plating solution that is arranged on both sides of the steel plates and sprays the plating solution onto the steel plate surfaces. In a method of manufacturing an electroplated steel sheet using a plating apparatus having a nozzle header for
The nozzle header is disposed on the back surface of the electrode with a gap from the electrode, and a plurality of plating solution ejection pipes formed to protrude from the nozzle header are provided on the nozzle header, and each plating of the nozzle header of the electrode is provided. A through hole for guiding the plating solution from the nozzle header between the steel plate and the electrode is provided through the electrode at a position corresponding to the liquid ejection tube, and plating is performed from the plurality of plating solution ejection tubes of the nozzle header. The nozzle header is divided into at least three sections or more with respect to the traveling direction of the steel sheet, and the nozzle headers in the opposing sections of the upper and lower surfaces of the steel sheet The ejection pressures of the nozzle headers in the opposing sections of the upper and lower surfaces of the steel plate are changed in order from the upstream side to the downstream side. Method of manufacturing an electro-plated steel sheet, characterized in that to reverse. 請求項２において、前記めっき液噴出管の外法は、前記貫通孔の内法より小さく、かつ、鋼板と電極間距離をａ、電極厚さをｂとしたときに、前記めっき液噴出管先端と鋼板との距離Ｈは、下式を満足することを特徴とする電気めっき鋼板の製造方法。
ｂ≦４ａ／３の場合、ａ−ｂ／２≦Ｈ≦ａ＋３ｂ／２
ｂ＞４ａ／３の場合、ａ／３≦Ｈ≦ａ＋３ｂ／２ 3. The tip of the plating solution ejection pipe according to claim 2, wherein the outer method of the plating solution ejection pipe is smaller than the inner method of the through hole, and the distance between the steel plate and the electrode is a and the electrode thickness is b. The distance H between the steel plate and the steel plate satisfies the following formula:
In the case of b ≦ 4a / 3, a−b / 2 ≦ H ≦ a + 3b / 2
When b> 4a / 3, a / 3 ≦ H ≦ a + 3b / 2 前記各貫通孔同士の間に、電極を貫通するめっき液排出孔を設けて、鋼板−電極間に噴射されためっき液を前記めっき液排出孔から排出することを特徴とする請求項１〜３のうちのいずれかの項に記載の電気めっき鋼板の製造方法。 The plating solution discharge hole which penetrates an electrode is provided between each said through-holes, The plating solution injected between the steel plate-electrode is discharged | emitted from the said plating solution discharge hole. The manufacturing method of the electroplating steel plate as described in any one of these. 連続的に走行する鋼板の両面側に鋼板を挟むように各々相対して配置した電極と、前記鋼板に通電するコンダクターロールと、前記鋼板の両面側に各々配置されて鋼板面にめっき液を噴射するためのノズルヘッダを有しためっき装置を用いて電気めっき鋼板を製造する方法において、
前記ノズルヘッダを前記電極の背面に前記電極に接するように配置するとともに、前記電極に該電極を貫通する複数の貫通孔を設けて、前記複数の貫通孔からめっき液を噴射して鋼板に対してほぼ垂直方向に衝突させてめっきするとともに、前記貫通孔同士の間に、電極を貫通するめっき液排出孔を設けて、鋼板−電極間に噴射されためっき液を前記めっき液排出孔から排出するとともに、前記ノズルヘッダを鋼板の走行方向に対して少なくとも３区画以上に分割し、鋼板の上下面の対向する区画のノズルヘッダの噴出圧力を異なるようにするとともに、鋼板の上下面の対向する区画のノズルヘッダの噴出圧力の大小関係を上流側から下流側にかけて順次逆転させることを特徴とする電気めっき鋼板の製造方法。 Electrodes arranged opposite to each other so that the steel plates are sandwiched between both sides of the continuously running steel plate, a conductor roll for energizing the steel plates, and a plating solution that is arranged on both sides of the steel plates and sprays the plating solution onto the steel plate surfaces. In a method of manufacturing an electroplated steel sheet using a plating apparatus having a nozzle header for
The nozzle header is disposed on the back surface of the electrode so as to be in contact with the electrode, and the electrode is provided with a plurality of through holes penetrating the electrode, and a plating solution is sprayed from the plurality of through holes to the steel plate. The plating solution is made to collide in a substantially vertical direction, and a plating solution discharge hole penetrating the electrode is provided between the through holes, and the plating solution sprayed between the steel plate and the electrode is discharged from the plating solution discharge hole. In addition, the nozzle header is divided into at least three sections with respect to the traveling direction of the steel sheet so that the jetting pressures of the nozzle headers in the facing sections of the upper and lower surfaces of the steel sheet are different, and the upper and lower surfaces of the steel sheet face each other. A method of manufacturing an electroplated steel sheet, wherein the magnitude relationship of the ejection pressure of the nozzle header of the compartment is sequentially reversed from the upstream side to the downstream side . めっき液噴出口同士の間隔またはめっき液噴出管同士の間隔（請求項５は貫通孔同士の間隔）：Ｌd、めっき液噴出口先端と鋼板との距離またはめっき液噴出管先端と鋼板との距離（請求項５は貫通孔の鋼板側端部と鋼板との距離）：Ｈ、めっき液噴出口の内径またはめっき液噴出管の内径（請求項５は貫通孔の内径）：ｄは、１≦Ｌd／Ｈ≦１０、且つ、１≦Ｈ／ｄ≦１５を満足することを特徴とする請求項１〜５のうちのいずれかの項に記載の電気めっき鋼板の製造方法。 Spacing between plating solution outlets or spacing between plating solution ejection pipes (Claim 5 is an interval between through holes): L d , distance between plating solution ejection tip and steel plate, or between plating solution ejection tube tip and steel plate Distance (Claim 5 is the distance between the steel plate side end of the through hole and the steel plate): H, the inner diameter of the plating solution outlet or the inner diameter of the plating solution ejection pipe (Claim 5 is the inner diameter of the through hole): d is 1 ≦ L d / H ≦ 10, and, the method of manufacturing an electro-plated steel sheet according to any of of the preceding claims 1 to 5, characterized in that satisfies 1 ≦ H / d ≦ 15. 連続的に走行する鋼板の両面側に鋼板を挟むように各々相対して配置した電極と、前記鋼板に通電するコンダクターロールと、前記鋼板の両面側に各々配置されて鋼板にめっき液を噴射するノズルヘッダを有しためっき装置を用いて電気めっき鋼板を製造する方法において、
前記ノズルヘッダを鋼板の走行方向に対して少なくとも３区画以上に分割し、鋼板の上下面の対向する区画のノズルヘッダの噴出圧力を異なるようにするとともに、鋼板の上下面の対向する区画のノズルヘッダの噴出圧力の大小関係を上流側から下流側にかけて順次逆転させてめっき液を噴射してめっきすることを特徴とする電気めっき鋼板の製造方法。 Electrodes arranged opposite to each other so that the steel plates are sandwiched between both sides of the continuously running steel plates, conductor rolls for energizing the steel plates, and sprayed onto the steel plates respectively arranged on both sides of the steel plates In a method for producing an electroplated steel sheet using a plating apparatus having a nozzle header,
Divided into at least three compartments or the nozzle header to the running direction of the steel sheet, as well as to different ejection nozzle pressure header opposing sections of the upper and lower surfaces of the steel sheet, the compartment facing the upper and lower surfaces of the steel plate nozzle A method for producing an electroplated steel sheet, wherein plating is performed by sequentially reversing the magnitude of the jetting pressure of the header from the upstream side to the downstream side and spraying a plating solution. 前記ノズルヘッダを前記電極の背面に前記電極と間隔をあけて配置するとともに、前記ノズルヘッダの各々の区画にめっき液噴出用開口部を設け、前記電極は、前記ノズルヘッダの前記各めっき液噴出用開口部に対応する位置に前記ノズルヘッダからのめっき液を鋼板−電極間に案内するための電極を貫通する開口部を設け、前記ノズルヘッダの前記めっき液噴出用開口部からめっき液を噴射して鋼板に対してほぼ垂直方向に衝突させることを特徴とする請求項７に記載の電気めっき鋼板の製造方法。 The nozzle header is arranged on the back surface of the electrode with a gap from the electrode, and an opening for plating solution ejection is provided in each section of the nozzle header, and the electrode ejects each plating solution of the nozzle header. An opening for penetrating the electrode for guiding the plating solution from the nozzle header between the steel plate and the electrode is provided at a position corresponding to the opening for use, and the plating solution is sprayed from the opening for ejecting the plating solution of the nozzle header The method for producing an electroplated steel sheet according to claim 7 , wherein the steel sheet is caused to collide with the steel sheet in a substantially vertical direction. 前記ノズルヘッダを前記電極の背面に前記電極と間隔をあけて配置するとともに、前記ノズルヘッダの各々の区画に前記ノズルヘッダから突出して形成しためっき液噴出用開口部を設け、前記電極は、前記ノズルヘッダの前記各めっき液噴出用開口部に対応する位置に前記ノズルヘッダからのめっき液を鋼板−電極間に案内するための電極を貫通する開口部を設け、前記ノズルヘッダからめっき液を噴射して鋼板に対してほぼ垂直方向に衝突させることを特徴とする請求項７に記載の電気めっき鋼板の製造方法。 The nozzle header is disposed on the back surface of the electrode at a distance from the electrode, and a plating solution ejection opening formed to protrude from the nozzle header is provided in each section of the nozzle header. An opening is formed through the electrode for guiding the plating solution from the nozzle header between the steel plate and the electrode at a position corresponding to each of the plating solution ejection openings of the nozzle header, and the plating solution is injected from the nozzle header. The method for producing an electroplated steel sheet according to claim 7 , wherein the steel sheet is caused to collide with the steel sheet in a substantially vertical direction. 前記ノズルヘッダを前記電極の背面に前記電極に接するように配置するとともに、前記ノズルヘッダの各々の区画に対応する電極部分に該電極を貫通する開口部を設けて、前記開口部からめっき液を噴射して鋼板に対してほぼ垂直方向に衝突させることを特徴とする請求項７に記載の電気めっき鋼板の製造方法。 The nozzle header is disposed on the back surface of the electrode so as to be in contact with the electrode, and an opening that penetrates the electrode is provided in an electrode portion corresponding to each section of the nozzle header, and a plating solution is supplied from the opening. The method for producing an electroplated steel sheet according to claim 7 , wherein the electroplated steel sheet is jetted to collide with the steel sheet in a substantially vertical direction. 前記電極の開口部及び前記ノズルヘッダのめっき液噴出口はいずれもスリット形状であることを特徴とする請求項８〜１０のうちのいずれかの項に記載の電気めっき鋼板の製造方法。 The method for producing an electroplated steel sheet according to any one of claims 8 to 10 , wherein both the opening of the electrode and the plating solution outlet of the nozzle header have a slit shape. 鋼板の走行方向に複数の電極が配置されためっき装置を用いて電気めっき鋼板を製造するに当たり、少なくとも１の電極において請求項１〜１１のうちのいずれかの項に記載の方法でめっきすることを特徴とする電気めっき鋼板の製造方法。 In producing an electroplated steel sheet using a plating apparatus in which a plurality of electrodes are arranged in the traveling direction of the steel sheet, plating is performed by the method according to any one of claims 1 to 11 on at least one electrode. A method for producing an electroplated steel sheet. 連続的に走行する鋼板の両面側に鋼板を挟むように各々相対して配置した電極と、前記鋼板に通電するコンダクターロールと、前記鋼板の両面側に各々配置されて鋼板面にめっき液を噴射するためのノズルヘッダを有しためっき装置を備える製造ライン中に鋼板のめっき付着量を計測する付着量計を配置し、この付着量計により測定した幅方向のめっき付着量に応じて、鋼板の上下面の対向するノズルヘッダからのめっき液の噴出圧力差を変更し、鋼板幅方向のめっき付着量分布を調整することを特徴とする請求項１〜１２のうちのいずれかの項に記載の電気めっき鋼板の製造方法。 Electrodes arranged opposite to each other so that the steel plates are sandwiched between both sides of the continuously running steel plate, a conductor roll for energizing the steel plates, and a plating solution that is arranged on both sides of the steel plates and sprays the plating solution onto the steel plate surfaces. In a production line equipped with a plating apparatus having a nozzle header for carrying out, an adhesion amount meter for measuring the amount of plating adhesion of the steel sheet is arranged, and according to the amount of plating adhesion in the width direction measured by this adhesion amount meter, It changes the jetting pressure difference of the plating solution from the nozzle header which the upper and lower surfaces oppose, and adjusts the plating adhesion amount distribution of a steel plate width direction, The one of Claims 1-12 characterized by the above-mentioned. Manufacturing method of electroplated steel sheet.
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