JPS6153436B2 - - Google Patents
Info
- Publication number
- JPS6153436B2 JPS6153436B2 JP24822783A JP24822783A JPS6153436B2 JP S6153436 B2 JPS6153436 B2 JP S6153436B2 JP 24822783 A JP24822783 A JP 24822783A JP 24822783 A JP24822783 A JP 24822783A JP S6153436 B2 JPS6153436 B2 JP S6153436B2
- Authority
- JP
- Japan
- Prior art keywords
- plated
- plating
- zinc
- electrolytic
- amount
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000007747 plating Methods 0.000 claims description 27
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 14
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims description 14
- 239000011701 zinc Substances 0.000 claims description 14
- 229910052725 zinc Inorganic materials 0.000 claims description 14
- 239000002131 composite material Substances 0.000 claims description 9
- 229910045601 alloy Inorganic materials 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 6
- 238000004070 electrodeposition Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 210000004027 cell Anatomy 0.000 description 13
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical group [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000010960 cold rolled steel Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 239000008151 electrolyte solution Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- ABXXWVKOBZHNNF-UHFFFAOYSA-N chromium(3+);dioxido(dioxo)chromium Chemical compound [Cr+3].[Cr+3].[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O ABXXWVKOBZHNNF-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 210000002287 horizontal cell Anatomy 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 239000002198 insoluble material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Description
【発明の詳細な説明】
産業上の利用分野
本発明は有機複合片面メツキ鋼板の製造におけ
るいわゆる裏回りメツキ成分の電解剥離方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for electrolytic stripping of so-called back plating components in the production of organic composite single-sided plated steel sheets.
なお、ここでのべる有機複合メツキ鋼板とは冷
延鋼板の片面に亜鉛又は亜鉛系合金メツキを施
し、しかる後に、電解クロメート処理を行ない、
さらに有機系塗装焼付を行ない、一方反対面につ
いては、冷延鋼板のままで、無処理状態になつて
いる鋼板を言う。 The organic composite plated steel sheet mentioned here is a cold-rolled steel sheet that is plated with zinc or zinc-based alloy on one side, and then subjected to electrolytic chromate treatment.
It refers to a steel plate that has been further baked with an organic paint, while the other side is left untreated as a cold-rolled steel plate.
従来技術
鋼板に亜鉛メツキを施して使用することは、耐
腐蝕性が要求される用途においては通例になつて
いるが、さらにこれにクロメート処理を施し、さ
らには有機皮膜塗装を施した有機複合メツキ鋼板
がきわめて耐腐蝕性の高い材料として主として自
動車用外板として賞用されている。この場合有機
複合メツキ側を自動車のドアの内側等に使用し、
冷延のままの反対面は、外側に使用するのが通例
である。Conventional technology Galvanized steel sheets are commonly used in applications where corrosion resistance is required, but organic composite plating, which is further treated with chromate and coated with an organic coating, has become common in applications where corrosion resistance is required. Steel plates are a material with extremely high corrosion resistance and are mainly used as exterior panels for automobiles. In this case, the organic composite plating side is used on the inside of a car door, etc.
The opposite side, which is still cold rolled, is usually used as the outside.
しかしながら上記のごとき片面電気メツキの場
合、一般に電解液中に浸漬される鋼板の一面と相
対する側に陽極を設け、鋼板を陰極として電気メ
ツキするが、裏回り電流のため反対面すなわち非
メツキ面にもメツキ成分が電着することは避け難
い。 However, in the case of single-sided electroplating as described above, an anode is generally provided on the side opposite to one side of the steel plate that is immersed in the electrolytic solution, and the steel plate is used as the cathode for electroplating, but because of the reverse current, the opposite side, that is, the non-plated side. It is difficult to avoid electrodeposition of the plating component on the surface.
そこで、反対面のメツキ成分を除去する必要が
あり、亜鉛片面メツキの場合の裏回りメツキ成分
の除去については電解剥離法がある。すなわち電
解液中に片面メツキ鋼板を浸漬し、該板を陽極に
し非メツキ面に相対して陰極を設けて通電し、非
メツキ面の裏回りメツキ成分を電解除去するもの
で、技術的に成功している。 Therefore, it is necessary to remove the plating component on the opposite side, and there is an electrolytic stripping method for removing the reverse plating component in the case of single-sided zinc plating. In other words, a single-sided plated steel plate was immersed in an electrolytic solution, the plate was used as an anode, and a cathode was provided opposite the non-plated side, and electricity was applied to electrolytically remove the back-plated components on the non-plated side.This was a technological success. are doing.
しかしながら、有機複合メツキの場合、塗装密
着性向上の目的で行なわれる電解クロメート処理
に於いては、電解クロメート処理液に鋼板を浸漬
し、片面のみ通電をするが、裏回り付着成分とし
て非メツキ面へのクローム付着があり、これは、
鋼板上の鉄との親和力がきわめて強く、通常の電
解剥離法では除去が困難である。 However, in the case of organic composite plating, in electrolytic chromate treatment performed for the purpose of improving paint adhesion, the steel plate is immersed in an electrolytic chromate treatment solution and energized only on one side. There is chrome adhesion to the
It has an extremely strong affinity with the iron on the steel plate and is difficult to remove using normal electrolytic stripping methods.
発明の目的
本発明は、このような有機複合メツキにおける
非メツキ面上の付着クロム成分の除去についてす
ぐれた電解剥離方法を提供するものである。OBJECTS OF THE INVENTION The present invention provides an excellent electrolytic stripping method for removing chromium components deposited on the non-plated surface of such organic composite plating.
発明の構成・作用
片面有機複合メツキを行う場合、先ず、片面亜
鉛メツキを行うが、その際若干の裏回りメツキ成
分が非メツキ面に付着する。その上にさらに片面
通電による電解クロメート処理を行うときに、非
メツキ面にも同様にクローム（クロメート）が若
干電着する。本発明者等は、非メツキ面上に付着
した塗装性に有害なクロムを除去する方法につい
て鋭意検討した結果、亜鉛又は亜鉛系合金メツキ
上に付着したクロムは、電解剥離によつて、メツ
キ成分と共に容易に除去できることを見い出し
た。従つて、はじめに行なう亜鉛メツキを、後の
プロセスで剥離を行なうべき面にうすく全面に薄
メツキしておき、ついで片面クロメート処理を行
い、裏回りクロメートがすべて亜鉛又は亜鉛系合
金薄メツキ層の表面に電着するようにし、ついで
電解剥離を行い、裏回りクロメートを亜鉛又は亜
鉛系合金メツキの薄層もろとも除去する方法を完
成したものである。Structure and operation of the invention When performing single-sided organic composite plating, firstly, single-sided galvanizing is performed, and at this time, some back-plating components adhere to the non-plated surface. When electrolytic chromate treatment is performed on top of that by applying current to one side, a small amount of chromium (chromate) is similarly electrodeposited on the non-plated side. As a result of intensive research into methods for removing chromium adhering to non-plated surfaces, which is harmful to paintability, the inventors found that chromium adhering to zinc or zinc-based alloy plating can be removed from the plating component by electrolytic stripping. It has been found that it can be easily removed. Therefore, the first step is to apply a thin layer of zinc plating to the entire surface that will be removed in a later process, and then apply chromate treatment to one side so that all the chromate on the back side is on the surface of the zinc or zinc-based alloy thin plating layer. This method has been completed to remove the backing chromate along with the thin layer of zinc or zinc-based alloy plating by electrodepositing it on the surface and then performing electrolytic peeling.
本方法を実施するに当つては、前述のように先
ず差厚メツキを施すのであるがこの場合厚目付側
のメツキ量は５〜60ｇ/m2、薄目付側のメツキ量
は約0.3〜1.5ｇ/m2が望ましい。何故ならば、0.3
ｇ/m2に満たぬ程度では必ずしも不均一な薄膜が
得られず、したがつてクロメート処理後の電解剥
離において、付着クロームの除去が完全には行な
われ難くなる。一方1.5ｇ/m2超もの付着量の場合
は、クロメート処理後の電解剥離に要する電力を
いたずらに増加させる結果になるからである。ク
ロメート処理ではメツキ面のクロメート量30〜60
mg/m2に対し、裏回りクロメート量は３〜７mg/m2
に達する。この後電解剥離を行えば、最終製品で
ある有機複合メツキ鋼板を自動車等に組立てた後
に行う、塗装前処理及び塗装処理に於いて非メツ
キ面側を良好な性能に期待できる。 To carry out this method, as mentioned above, first the differential thickness plating is applied. In this case, the amount of plating on the thicker side is 5 to 60 g/m 2 and the amount of plating on the lighter side is about 0.3 to 1.5. g/m 2 is desirable. Because 0.3
If the amount is less than g/m 2 , a non-uniform thin film cannot necessarily be obtained, and therefore, it becomes difficult to completely remove deposited chromium in electrolytic peeling after chromate treatment. On the other hand, if the coating weight exceeds 1.5 g/m 2 , the power required for electrolytic stripping after chromate treatment will be unnecessarily increased. In chromate treatment, the amount of chromate on the plated surface is 30 to 60
mg/m 2 , the amount of chromate on the back side is 3 to 7 mg/m 2
reach. If electrolytic stripping is performed after this, the non-plated side can be expected to have good performance in pre-painting treatment and painting treatment performed after the final product, organic composite plated steel sheet, is assembled into an automobile or the like.
以上詳述したように、本発明を実施するに当り
亜鉛又は亜鉛系合金メツキを非メツキ面にうすく
メツキを行う電解槽の構造がきわめて重要とな
る。 As detailed above, in carrying out the present invention, the structure of the electrolytic cell in which the unplated surface is thinly plated with zinc or zinc-based alloy plating is extremely important.
従来使用されている竪型セルに於ては、基材で
ある冷延鋼板の振動がはげしくＣ反りもおこり、
付着のバラツキはきわめて大きい。とくに１セル
でメツキを行う場合は顕著である。複数個のセル
でメツキを行うと付着量は平均化されるが、付着
量そのものは多くなり、前述のように電解剥離の
ための薄メツキには適さない。 In conventionally used vertical cells, the cold-rolled steel plate that is the base material vibrates violently, causing C warping.
The variation in adhesion is extremely large. This is particularly noticeable when plating is performed on one cell. If plating is performed on a plurality of cells, the amount of adhesion will be averaged, but the amount of adhesion itself will increase, making it unsuitable for thin plating for electrolytic stripping as described above.
横型セルにおいては電解液を電解槽の片側から
反対側に、鋼板の横方向から鋼板と向流に流す方
法あるいは電解液を電極中央部に設けたスリツト
から噴入させ電解槽の両側から流出させ、鋼板と
は前半向流、後半並流となるようにした方式（中
央噴射方式と略称）などがある。これらはいずれ
もＣ反りやカテナリー、特に付着量の分布に密接
な関係のあるＣ反りを防止することは困難で、付
着量の巾も0.1〜５ｇで良くない。 In horizontal cells, the electrolyte can be flowed from one side of the electrolytic cell to the other in a countercurrent flow to the steel plate from the side of the steel plate, or the electrolyte can be injected through a slit in the center of the electrode and flowed out from both sides of the electrolytic cell. For steel plates, there is a method (abbreviated as central injection method) in which the first half is counter-flow and the second half is parallel flow. In any of these methods, it is difficult to prevent C warping and catenary, especially C warping which is closely related to the distribution of the amount of adhesion, and the width of the amount of adhesion is 0.1 to 5 g, which is not good.
本発明の薄メツキに最も適するものは、出願人
が先に出願した特願昭57−18836（特開昭58−
136796）号公報で詳細説明した水平型流体支持電
解槽である。すなわち、水平に通過するめつきす
べきストリツプ３の上下面に不溶性材料からなる
陽極１を対向配置した電解槽２において、ストリ
ツプ３と対向する電極面の一部に、電解液噴射用
で且つストリツプ面に静圧を発生せしめるための
スリツトノズルを有する静圧流体支持パツド１２
を上下対称に設けることを特徴とする水平型流体
支持電解槽である。これを第１図に図示した。 The most suitable material for the thin plating of the present invention is Japanese Patent Application No. 57-18836 (Japanese Unexamined Patent Publication No. 58-1989) filed earlier by the applicant.
This is a horizontal fluid-supported electrolytic cell described in detail in Publication No. 136796. That is, in an electrolytic cell 2 in which an anode 1 made of an insoluble material is disposed facing the upper and lower surfaces of a strip 3 to be plated that passes horizontally, a part of the electrode surface facing the strip 3 is provided with a strip surface for spraying an electrolytic solution. a hydrostatic fluid support pad 12 having a slit nozzle for generating static pressure;
This is a horizontal fluid-supported electrolytic cell characterized by vertically symmetrical installation of the electrolytic cell. This is illustrated in FIG.
実施例及び発明の効果
該槽の極間距離９mm／９mm、静圧300m/mAq
以上で電解液流量は中央パツド１２，１２でそれ
ぞれ1.8m3/min、液シールノズル１３，１３でそ
れぞれ0.2m3/minで操業した場合と、前述の中央
噴射方式の場合とで、ストリツプ巾方向のバラツ
キを比較した図を第２図、第３図に示す。第２図
の付着量の各プロツトは、第３図に示すようにス
トリツプ長さ方向に150mm間隔で巾方向の端から
同一距離の点６ケについての付着量の平均値を示
し、Ａは水平型流体支持電解槽を用いた場合、Ｂ
は中央噴射方式の場合で、Ａの付着量の均整さは
抜群であり、横軸に示した５ケ所計30ケのバラツ
キ（σ）は0.015ｇ/m2ときわめて小さく、薄メツ
キ用としての該槽の適性が証明された。Examples and effects of the invention The distance between the poles of the tank is 9 mm/9 mm, and the static pressure is 300 m/mAq.
As described above, the electrolyte flow rate is 1.8 m 3 /min for the central pads 12, 12, 0.2 m 3 /min for the liquid seal nozzles 13, 13, and the strip width for the central injection method described above. Figures 2 and 3 show comparisons of directional variations. Each plot of the amount of adhesion in Figure 2 shows the average value of the amount of adhesion at six points at 150 mm intervals in the length direction of the strip and the same distance from the edge in the width direction, as shown in Figure 3, and A is the horizontal value. When using a type fluid supported electrolytic cell, B
is for the case of the central injection method, and the uniformity of the deposit amount of A is outstanding, and the variation (σ) at 30 locations in 5 locations shown on the horizontal axis is extremely small at 0.015 g/m 2 , making it suitable for thin plating. The suitability of the tank was proven.
第１図は水平型流体支持電解槽、第２図は水平
型流体支持電解槽と従来法の薄メツキ付着量分布
の比較図、第３図は第２図のサンプル採取位置を
示す図である。
１……陽極、２……箱型槽、３……鋼板、４…
…受槽、５……メツキ液取出口、６……コンダク
トロール、７……バツクアツプロール、８，９…
…排出口、１０……ヘツダー、１２……流体パツ
ド、１３……液シールノズル、１４……液シール
ヘツダー、１５……邪魔板。
Figure 1 is a horizontal fluid-supported electrolytic cell, Figure 2 is a comparison of the distribution of thin plating deposits between a horizontal fluid-supported electrolytic cell and a conventional method, and Figure 3 is a diagram showing the sampling positions in Figure 2. . 1... Anode, 2... Box-shaped tank, 3... Steel plate, 4...
...Receiving tank, 5...Metting liquid outlet, 6...Conduct roll, 7...Backup roll, 8,9...
...Discharge port, 10...Header, 12...Fluid pad, 13...Liquid seal nozzle, 14...Liquid seal header, 15...Baffle plate.
Claims (1)
たは亜鉛系合金のメツキを非メツキ面に薄メツキ
し、クロメート処理後に電解剥離することを特徴
とする有機複合片面メツキ鋼板の製造方法。 ２ 非メツキ面の薄メツキを水平型流体支持電解
槽で行ない、電着量を0.3〜1.5ｇ/m2の範囲とす
る特許請求の範囲第１項記載の方法。[Scope of Claims] 1. A method for manufacturing an organic composite single-sided plated steel sheet, which comprises applying thin plating of zinc or zinc-based alloy to the non-plated surface, and electrolytically peeling the plated surface after chromate treatment. . 2. The method according to claim 1, wherein the non-plated surface is thinly plated in a horizontal fluid-supported electrolytic cell, and the amount of electrodeposition is in the range of 0.3 to 1.5 g/ m2 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24822783A JPS60145393A (en) | 1983-12-30 | 1983-12-30 | Production of organic composite plated steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24822783A JPS60145393A (en) | 1983-12-30 | 1983-12-30 | Production of organic composite plated steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60145393A JPS60145393A (en) | 1985-07-31 |
| JPS6153436B2 true JPS6153436B2 (en) | 1986-11-18 |
Family
ID=17175059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24822783A Granted JPS60145393A (en) | 1983-12-30 | 1983-12-30 | Production of organic composite plated steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60145393A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2737869B2 (en) * | 1994-08-22 | 1998-04-08 | キヤノン株式会社 | Image processing method |
-
1983
- 1983-12-30 JP JP24822783A patent/JPS60145393A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60145393A (en) | 1985-07-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |