JPH07173673A - Production of tin electroplated steel sheet - Google Patents
Production of tin electroplated steel sheetInfo
- Publication number
- JPH07173673A JPH07173673A JP32075693A JP32075693A JPH07173673A JP H07173673 A JPH07173673 A JP H07173673A JP 32075693 A JP32075693 A JP 32075693A JP 32075693 A JP32075693 A JP 32075693A JP H07173673 A JPH07173673 A JP H07173673A
- Authority
- JP
- Japan
- Prior art keywords
- plating
- steel sheet
- bath
- tank
- tin
- 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.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鋼板の連続電気錫めっ
き方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously electroplating a steel sheet.
【０００２】[0002]
【従来の技術】一般に、鋼板の電気錫めっきラインにお
いては、電気めっき前に、脱脂→水洗→酸洗→水洗→
（電気めっき）の順に前処理が行われる。したがって、
電気めっき槽に入る鋼板の表面には、金属の水酸化被膜
が生成するとともに水洗水が付着している。これらの付
着生成物は、電気めっきに対して次のような悪影響を与
えることが知られている。 １．めっき外観の不良 ２．めっき付着量ムラ、または局部的な不めっき部の生
成 しかし、これらの付着生成物は、電気めっき槽へ鋼板を
送入した際に短時間のうちに除去され、しかもこの時間
が鋼板の電気めっき槽における滞留時間に比し十分小さ
かったので、これまで問題となることは少なかった。2. Description of the Related Art Generally, in an electric tin plating line for steel sheets, degreasing → washing → pickling → washing →
Pretreatment is performed in the order of (electroplating). Therefore,
On the surface of the steel plate that enters the electroplating tank, a metal hydroxide film is formed and rinsing water is attached. These deposition products are known to have the following adverse effects on electroplating. 1. Poor plating appearance 2. However, these deposit products are removed within a short time when the steel sheet is sent to the electroplating tank, and this time is the time for electroplating the steel sheet. Since it was sufficiently smaller than the residence time in the tank, it was not a problem until now.
【０００３】[0003]
【発明が解決しようとする課題】ところが、近年材料の
コストダウンや製造プロセスの効率化に対する要求の高
まりに伴い、めっきラインの高速化や薄めっき化が検討
されるようになり、この付着生成物による影響が無視で
きなくなっている。However, in recent years, with the increasing demand for cost reduction of materials and efficiency improvement of manufacturing processes, the speeding up and thinning of plating lines have been studied. The effect of can no longer be ignored.
【０００４】本発明者らは、電気錫めっきラインにおけ
るめっきセクションの短縮化及びライン速度アップのた
めに、竪型めっき槽、ラジアル型、水平型の各電解セル
について種々の検討を行った。その結果、竪型めっき槽
の最初のダウンパスやラジアル型セル、水平型セルのよ
うに、鋼板がめっき液に浸漬した直後からめっきが開始
されるめっき槽の場合、以下のような問題が生ずること
がわかった。 １．ライン速度の上昇に伴い、最初の電解パスにおける
電解効率が低下する。 ２．この電解効率の低下は、不規則であり、めっき付着
量の制御が困難である。 ３．薄めっき材で、電解距離を短縮した場合、めっき付
着量ムラによる外観不良や不めっき部に起因する耐食性
の低下を生ずる。The present inventors have conducted various studies on vertical electrolytic baths, radial electrolytic cells, and horizontal electrolytic cells in order to shorten the plating section and increase the line speed in the electric tin plating line. As a result, in the case of a plating tank in which the plating is started immediately after the steel plate is immersed in the plating solution, such as the first downpass or radial type cell of the vertical plating tank, the horizontal type cell, the following problems occur. I understood it. 1. As the line speed increases, the electrolysis efficiency in the first electrolysis pass decreases. 2. This decrease in electrolysis efficiency is irregular, and it is difficult to control the amount of plating adhered. 3. When the electrolysis distance is shortened with a thin plated material, poor appearance due to uneven coating amount and deterioration of corrosion resistance due to the unplated portion occur.
【０００５】これらの問題の主たる原因は鋼板表面の付
着生成物であるから、電気めっき槽において、この付着
生成物の除去を行うための十分な区間を確保するという
目的で、例えば、錫付着量が２．８ｇ／ｍ2 で、ライン
速度２００〜６００ｍ／分で操業される＃２５ぶりきの
竪型セルによる製造ラインにおいて、最初の電気めっき
槽のダウンパスでは電解を行わず、アップパスから電解
を開始するという試みが行われている。しかし、この場
合、電解を行わないダウンパス部は、単にめっき液貯槽
として機能しているのみで、本来の電気めっき槽として
の機能を果たしておらず、めっきセクションの短縮化に
逆行するものである。更に、ライン速度を高速化し、さ
らにめっきセクションを短縮化してめっき液の使用量を
減らした場合、前処理工程で鋼板に付着した液によりめ
っき液が急速に劣化する。Since the main cause of these problems is the deposit products on the surface of the steel sheet, for the purpose of securing a sufficient section for removing the deposit products in the electroplating bath, for example, the amount of tin deposits 2.8 g / m 2 at a line speed of 200 to 600 m / min. In a production line using a vertical cell of # 25 tin plate, electrolysis is not performed in the first electroplating tank down pass, Attempts have been made to initiate electrolysis. However, in this case, the down-pass section that does not perform electrolysis merely functions as a plating solution storage tank, does not function as the original electroplating tank, and runs counter to the shortening of the plating section. . Furthermore, when the line speed is increased and the plating section is shortened to reduce the amount of the plating solution used, the plating solution is rapidly deteriorated by the solution adhering to the steel sheet in the pretreatment process.
【０００６】本発明は、めっきセクションを短縮化し、
ライン速度を大きくしても、上述したような問題が生じ
ず、しかもめっき付着量制御が容易であり、耐食性およ
び外観の優れた錫めっき鋼板を製造することのできる電
気錫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 shortens the plating section,
Even if the line speed is increased, the above-mentioned problems do not occur, and the coating amount can be easily controlled, and a method for producing an electric tin-plated steel sheet that is excellent in corrosion resistance and appearance can be produced. The purpose is to provide.
【０００７】[0007]
【課題を解決するための手段】本発明は、鋼板を浸漬槽
の中でめっき液に浸漬する工程と、この工程の後、鋼板
に前記浸漬槽と区分されためっき槽の中で電気錫めっき
を施す工程とを備えたことを特徴とする電気錫めっき鋼
板の製造方法である。According to the present invention, there is provided a step of immersing a steel sheet in a plating solution in a dipping bath, and, after this step, electroplating of steel sheet in a plating bath separated from the dipping bath. The method for producing an electrotin-plated steel sheet is characterized by including the step of:
【０００８】本発明において、鋼板を浸漬するめっき液
は、鋼板に電気錫めっきを施す際に使用されるめっき
液、このめっき液に類似する組成の液、更にめっき液に
含有されるフェノ−ルスルホン酸、メタンスルホン酸等
の有機酸液を含む。In the present invention, the plating solution for immersing the steel sheet is a plating solution used when electroplating a steel sheet, a solution having a composition similar to this plating solution, and a phenol sulfone contained in the plating solution. Includes organic acids such as acids and methanesulfonic acid.
【０００９】本発明は、ライン速度が１００ｍ／分以上
である電気めっきラインにおいて有効であり、３００ｍ
／分以上の高速電気めっきラインにおいて特に有効であ
る。浸漬する時間は、ライン速度にかかわらず、０．６
秒〜１５秒間が適当である。電解効率の低下を防止する
だけであれば、０．２秒間とれば十分であるが、めっき
ムラや不めっき部の生成を防止するためには、０．６秒
以上の浸漬時間が必要である。また、浸漬時間を１５秒
間以上としても、本発明の方法による効果を得る上で何
ら問題は無いが、槽の大きさが必要以上に大となり無益
である。The present invention is effective in an electroplating line having a line speed of 100 m / min or more, and 300 m
It is especially effective in high-speed electroplating lines of above min / min. The immersion time is 0.6 regardless of the line speed.
Seconds to 15 seconds are suitable. If it is only to prevent a decrease in electrolytic efficiency, 0.2 seconds is sufficient, but to prevent uneven plating and formation of an unplated portion, a dipping time of 0.6 seconds or more is required. . Further, even if the immersion time is 15 seconds or more, there is no problem in obtaining the effect of the method of the present invention, but the size of the tank is unnecessarily large and it is not useful.
【００１０】また、本発明は、上記電気錫めっき鋼板の
製造方法において、鋼板をめっき液に浸漬する工程が、
超音波を照射しながら行う工程であることを特徴とする
電気錫めっき鋼板の製造方法である。鋼板の浸漬を超音
波照射下で行うことにより、必要な浸漬時間を超音波を
照射しない場合の１／２から１／１０に短縮することが
できる。照射する超音波の周波数として特に適当なの
は、１〜５０ｋＨｚの範囲である。超音波の周波数が１
ｋＨｚ未満の場合、十分な効果を得るためには、超音波
を照射しない場合と同程度の浸漬時間が必要になる。ま
た、超音波の周波数が５０ｋＨｚを超えると、超音波照
射の際のインピ−ダンスが高くなり、必要な超音波強度
を確保することが困難になる。この範囲の周波数の超音
波を照射することにより、必要な浸漬時間を超音波を照
射しない場合の１／５から１／１０と大幅に短縮するこ
とができる。Further, in the present invention, in the above method for producing an electrotin-plated steel sheet, the step of immersing the steel sheet in a plating solution comprises:
It is a method for producing an electrotin-plated steel sheet, which is a step performed while irradiating ultrasonic waves. By performing the immersion of the steel sheet under ultrasonic irradiation, the required immersion time can be shortened to 1/2 to 1/10 of the case of not applying ultrasonic waves. The range of 1 to 50 kHz is particularly suitable as the frequency of the ultrasonic waves to be irradiated. Ultrasonic frequency is 1
In the case of less than kHz, in order to obtain a sufficient effect, the same immersion time as in the case of not applying ultrasonic waves is required. Further, when the frequency of ultrasonic waves exceeds 50 kHz, the impedance at the time of ultrasonic wave irradiation becomes high, and it becomes difficult to secure the necessary ultrasonic wave intensity. By irradiating ultrasonic waves with a frequency in this range, the required immersion time can be greatly shortened to ⅕ to 1/10 as compared with the case where ultrasonic waves are not radiated.
【００１１】[0011]
【作用】めっき槽の直前にめっき槽とは区分されためっ
き液を入れた槽を設置し、鋼板をこの槽中でめっき液に
浸漬させることにより、鋼板に付着した付着生成物を除
去することができ、前述したようなこの付着生成物に起
因する問題が解消される。その結果、ライン速度を大き
くした場合にも、良好な電解効率が得られるとともに、
めっき付着量制御が容易になり、耐食性および外観の優
れた電気錫めっき鋼板を効率良く製造することができる
ものである。[Operation] A tank containing a plating solution separated from the plating tank is installed immediately before the plating tank, and the steel plate is immersed in the plating solution to remove the deposit products attached to the steel sheet. Therefore, the problems caused by the above-mentioned deposition products are eliminated. As a result, good electrolysis efficiency can be obtained even when the line speed is increased,
This makes it possible to easily control the coating amount of plating and efficiently manufacture an electrotin-plated steel sheet having excellent corrosion resistance and appearance.
【００１２】さらに、鋼板をめっき液に浸漬する際に、
超音波を照射することにより、鋼板に付着した付着生成
物の除去が迅速かつ効率的に行われ、浸漬時間を大幅に
短縮することができる。Further, when the steel sheet is immersed in the plating solution,
By irradiating with ultrasonic waves, the adhered products adhered to the steel sheet can be removed quickly and efficiently, and the immersion time can be greatly shortened.
【００１３】また、本発明の方法によれば、鋼板を浸漬
する槽とめっき槽とは区分されており、付着生成物の混
入によるめっき液の劣化がほとんどなく、めっき液の組
成を長時間安定、維持することができる。Further, according to the method of the present invention, the bath for immersing the steel plate and the plating bath are separated, and the plating solution is hardly deteriorated by the inclusion of the deposit product, and the composition of the plating solution is stable for a long time. , Can be maintained.
【００１４】[0014]
【実施例】以下、本発明の実施例について説明する。図
１は、本発明を実施した電気めっきラインの構成を示す
模式側面図である。この電気めっきラインは、脱脂槽
１、水洗槽２、酸洗槽３、水洗槽４、浸漬槽５、めっき
槽６を順に配置し、各槽の底部にシンクロ−ル１２を、
出口部に絞りロ−ル７を、更に脱脂槽１、酸洗槽３、め
っき槽６の各槽の入り口部及び出口部にコンダクタ−ロ
−ル１０を配置し、鋼板９が各槽内を順に蛇行して走行
するようになっている。水洗槽２、４内には、スプレ−
８がそれぞれ設置されている。浸漬槽５の底部外面に
は、超音波発信子１３が取り付けられている。また、脱
脂槽１、酸洗槽３、めっき槽６の各槽内には、陽極１１
が鋼板９の走行方向に沿って配置されている。EXAMPLES Examples of the present invention will be described below. FIG. 1 is a schematic side view showing the configuration of an electroplating line embodying the present invention. In this electroplating line, a degreasing tank 1, a water washing tank 2, a pickling tank 3, a water washing tank 4, a dipping tank 5 and a plating tank 6 are arranged in order, and a synchronizer 12 is provided at the bottom of each tank.
A squeeze roll 7 is arranged at the outlet, and a conductor roll 10 is arranged at the inlet and outlet of each tank of the degreasing tank 1, the pickling tank 3 and the plating tank 6, and a steel plate 9 is provided inside each tank. They meander in order and travel. In the washing tanks 2 and 4, spray
8 are installed respectively. An ultrasonic transmitter 13 is attached to the outer surface of the bottom of the immersion tank 5. Further, in each of the degreasing tank 1, the pickling tank 3, and the plating tank 6, an anode 11 is provided.
Are arranged along the traveling direction of the steel plate 9.
【００１５】鋼板は、まず脱脂槽１において電解脱脂処
理される。次ぎに、水洗槽２で水洗後、酸洗槽３に送ら
れ、酸洗処理される。続いて、水洗槽４で水洗後、浸漬
槽５に送られ、ここでめっき液に浸漬されることによ
り、それまでの処理によって鋼板の表面に生成、付着し
た付着生成物が除去される。この際、浸漬槽底部外面に
設置した超音波発信子１３を用いて鋼板に超音波を照射
することにより、付着生成物の除去をいっそう迅速かつ
効果的に行うことができる。なお、超音波発信子の取り
付け位置は、浸漬槽底部外面に限定されず、鋼板に効果
的に超音波を照射できる位置ならば、浸漬槽の内面、外
面、上部、底部等いずれの位置でも良く、また複数の位
置に設置しても良い。浸漬処理された鋼板は、続いてめ
っき槽６に送られ、ここで所定量の錫を電気めっきされ
た後、必要な後処理工程を経て製品となる。First, the steel sheet is electrolytically degreased in the degreasing tank 1. Next, after being washed with water in the washing tank 2, it is sent to the pickling tank 3 and subjected to pickling treatment. Subsequently, after being washed with water in the water washing tank 4, it is sent to the dipping tank 5 where it is immersed in the plating solution, so that the adhered products produced and adhered to the surface of the steel sheet by the treatments so far are removed. At this time, by irradiating the steel sheet with ultrasonic waves using the ultrasonic wave transmitter 13 installed on the outer surface of the bottom of the dipping tank, the adhered products can be removed more quickly and effectively. The position of mounting the ultrasonic transmitter is not limited to the outer surface of the bottom of the immersion tank, and any position such as the inner surface of the immersion tank, the outer surface, the upper portion or the bottom may be used as long as it can effectively irradiate the steel sheet with ultrasonic waves. Also, it may be installed at a plurality of positions. The steel sheet that has been subjected to the immersion treatment is subsequently sent to a plating tank 6, where a predetermined amount of tin is electroplated, and then a product is subjected to a necessary post-treatment process.
【００１６】また、本発明は、図１に示したようなめっ
き槽が竪型である電気めっきラインだけでなく、めっき
槽においてめっき前浸漬部分の確保が困難なラジアルセ
ル型や水平セル型のめっき槽を有する電気めっきライン
において特に有効である。めっき槽が、ラジアルセル型
である電気めっきラインと水平対向噴流セル型である電
気めっきラインに、本発明の方法を適用した場合の模式
側面図を各々図２、図３に示す。図２において、６’は
ラジアルセル型めっき槽を表し、図３において、６”は
水平対向噴流セル型めっき槽を、１４は噴流ノズルを、
１５は溶液止めを表している。なお、図２および図３に
おいて、図１と同一の構成については同一の符号を付
し、その説明を省略する。Further, according to the present invention, not only the electroplating line in which the plating tank is vertical as shown in FIG. 1 but also the radial cell type or horizontal cell type in which it is difficult to secure a pre-plating immersion portion in the plating tank is used. It is particularly effective in an electroplating line having a plating tank. 2 and 3 are schematic side views when the method of the present invention is applied to a radial cell type electroplating line and a horizontal opposed jet cell type electroplating line. In FIG. 2, 6'represents a radial cell type plating tank, and in FIG. 3, 6 '' represents a horizontally opposed jet cell type plating tank, 14 a jet nozzle,
Reference numeral 15 represents a solution stopper. 2 and 3, the same components as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.
【００１７】次ぎに、図１に示したような構成のラボス
ケ−ルめっきラインを用いた本発明の実験例を説明す
る。鋼板（１００ｍｍ幅×０．２ｍｍ厚）に対し、脱脂
→ロ−ル絞り→水洗→ロ−ル絞り→酸洗→ロ−ル絞り→
水洗→ロ−ル絞り の処理を施し、続いて、めっき液を
入れた浸漬槽で浸漬処理後、めっき槽で連続電気錫めっ
きを実施した。なお、本実験例では、鋼板の浸漬時間の
調節は、ライン速度に応じて、浸漬槽のめっき液の深さ
を変える方法により、または浸漬槽底部に設置したシン
クロ−ルを２本にし、この間隔を変える方法により、あ
るいはこれらを併用することにより行った。Next, an experimental example of the present invention using a lab scale plating line configured as shown in FIG. 1 will be described. Degreasing → roll drawing → water washing → roll drawing → pickling → roll drawing → for steel plate (100 mm width × 0.2 mm thickness)
After washing with water and squeezing a roll, the plate was immersed in a dipping bath containing a plating solution, and then continuously electroplated with tin in the plating bath. In this experimental example, the immersion time of the steel sheet was adjusted by changing the depth of the plating solution in the immersion tank according to the line speed, or by using two synchronizers installed at the bottom of the immersion tank. The measurement was performed by changing the interval or by using these in combination.
【００１８】本実験例において使用した超音波発信子
は、ボルト締めのランジュバン型発信子で、超音波を照
射する場合は、１２００Ｗのドライバで駆動して行っ
た。また、めっき槽の陽極には、電極長さ０．５ｍの不
溶性電極を使用し、鋼板がめっき槽中のめっき液に浸漬
した直後から、電気めっきが開始される位置に配置し
た。The ultrasonic wave transmitter used in this experimental example is a Langevin type oscillator tightened with bolts, and when it is irradiated with ultrasonic waves, it is driven by a 1200 W driver. An insoluble electrode having an electrode length of 0.5 m was used as the anode of the plating tank, and the steel plate was placed at a position where electroplating was started immediately after the steel plate was immersed in the plating solution in the plating tank.
【００１９】電気錫めっきの条件は、次の通りである。 めっき液：フェロスタン 温度 ：４５℃ 電解電流密度：３０Ａ／ｄｍ2 超音波を照射せずに、ライン速度を１２〜２１０ｍ／分
の範囲で、鋼板の浸漬槽における浸漬時間を０．６〜１
５秒の範囲で変化させてめっきを行い、めっき後の鋼板
の、電解効率、鋼板表面のめっき付着量ムラ、めっき浴
の劣化について調べた結果を表１の実施例１〜実施例４
に示す。各項目の評価方法は、次のようにした。電解効
率は、９８％以上を○、９８％未満を×、鋼板表面のめ
っき付着量ムラは、めっき面に不めっき部が観察されな
かった場合は○、観察された場合は×、めっき浴の劣化
は、１０分間連続電解を実施し、めっき槽のめっき液上
層部のｐＨ値が０．１以上上昇した場合を×、０．１以
上上昇しなかった場合を○とした。The conditions for electrotin plating are as follows. Plating solution: ferrostane Temperature: 45 ° C. Electrolytic current density: 30 A / dm 2 Without irradiating ultrasonic waves, the line speed is in the range of 12 to 210 m / min, and the immersion time of the steel sheet in the immersion tank is 0.6 to 1
The plating was carried out by changing the range of 5 seconds, and the electrolysis efficiency of the plated steel sheet, the unevenness of the amount of plating adhered on the surface of the steel sheet, and the deterioration of the plating bath were examined, and the results are shown in Examples 1 to 4 of Table 1.
Shown in. The evaluation method of each item was as follows. The electrolysis efficiency is 98% or more as ◯, less than 98% as ×, and uneven plating amount on the steel plate surface is ◯ when no unplated portion is observed on the plated surface, × when observed, and plating bath Deterioration was carried out by conducting continuous electrolysis for 10 minutes, and when the pH value of the plating solution upper layer portion of the plating tank increased by 0.1 or more, x was given, and when it was not increased by 0.1 or more, it was given as o.
【００２０】なお、表１中の所要浸漬長さＳ（ｃｍ）と
安定化時間Ｔ（秒）は、ライン速度Ｌ（ｍ／分）と電解
効率Ｃ（％）の測定値から、次式を用いて計算される値
で、各々最初の電解パスにおいて、鋼板表面の付着生成
物のために有効に機能しなかった電極部分の長さとその
部分を鋼板が通過するのに要した時間を表す。The required immersion length S (cm) and stabilization time T (second) in Table 1 are calculated by the following equations from the measured values of line speed L (m / min) and electrolysis efficiency C (%). The value calculated using each represents the length of the electrode portion which did not function effectively due to the deposit products on the surface of the steel sheet and the time required for the steel sheet to pass through that portion in the first electrolytic pass.
【００２１】 Ｓ＝５０ｃｍ（電極長さ）×（１−Ｃ／１００） Ｔ＝０．５ｍ（電極長さ）×（１−Ｃ／１００）／Ｌ×
６０ これらの結果より、電解効率が良好で、めっき付着量ム
ラの無い、外観、耐食性の優れた鋼板を得るためには、
めっき前の浸漬時間を０．６秒以上とればよいことがわ
かる。また、いずれの例においても、浸漬槽をめっき槽
とは独立に設置してあるため、めっき浴の劣化はみられ
なかった。S = 50 cm (electrode length) × (1-C / 100) T = 0.5 m (electrode length) × (1-C / 100) / L ×
60 From these results, in order to obtain a steel sheet having good electrolysis efficiency, uniform coating amount, and excellent appearance and corrosion resistance,
It is understood that the immersion time before plating should be 0.6 seconds or more. Further, in each of the examples, since the immersion bath was installed independently of the plating bath, deterioration of the plating bath was not observed.
【００２２】次に、ライン速度を２１０ｍ／分とし、浸
漬槽において超音波を照射しながら、鋼板の浸漬時間を
０．０６秒〜０．４秒の範囲で変化させてめっきを行
い、めっき後の鋼板の、電解効率、鋼板表面のめっき付
着量ムラ、めっき浴の劣化について調べた結果を表１の
実施例５〜実施例１０に示す。実施例３と実施例７とを
比較すると、２０ｋＨｚの超音波を照射した場合、必要
な浸漬時間が超音波を照射しない場合の１／１０でよい
ことがわかる。このように、鋼板のめっき液への浸漬を
超音波照射下で行うことにより、良好な電解効率とめっ
き付着量ムラの無い、外観、耐食性の優れた鋼板を得る
ために必要なめっき前浸漬時間を大幅に短縮できること
がわかる。また、実施例５〜実施例１０においても、め
っき浴の劣化は、認められなかった。Next, the line speed was set to 210 m / min, plating was performed while irradiating ultrasonic waves in the dipping tank while changing the dipping time of the steel plate within the range of 0.06 seconds to 0.4 seconds. The results of examining the electrolytic efficiency of the steel sheet of No. 3, the unevenness of the amount of plating deposited on the steel sheet surface, and the deterioration of the plating bath are shown in Examples 1 to 10 of Table 1. Comparing Example 3 with Example 7, it can be seen that when the ultrasonic wave of 20 kHz is applied, the required immersion time is 1/10 of that when the ultrasonic wave is not applied. In this way, by performing the immersion of the steel sheet in the plating solution under ultrasonic irradiation, good electrolysis efficiency and no uneven coating amount, appearance, and immersion time before plating required to obtain a steel sheet with excellent corrosion resistance It can be seen that can be greatly shortened. Also, in Examples 5 to 10, no deterioration of the plating bath was observed.
【００２３】比較例１〜比較例１０ 次に、本発明の実施効果を比較試験結果をもって明らか
にする。実施例１〜実施例１０の試験で使用した電気め
っきラインにおける浸漬槽を使用せず、図４に示すよう
に、酸洗槽３の後の水洗槽４を出た鋼板が、めっき液へ
の浸漬処理を経ずに直接めっき槽６に送入されるように
した電気めっきラインを使用し、ライン速度を１２〜２
１０ｍ／分の範囲で変化させてめっきを行い、めっき後
の鋼板の、電解効率、鋼板表面のめっき付着量ムラ、め
っき浴の劣化について調べた結果を表２の比較例１〜比
較例６に示す。表中の各項目の測定方法および評価方法
は、表１と同様である。また、図４において図１と同一
の符号は、同一の構成を示す。Comparative Examples 1 to 10 Next, the effect of the present invention will be clarified by the results of comparative tests. As shown in FIG. 4, the steel plate which left the washing bath 4 after the pickling bath 3 did not use the dipping bath in the electroplating line used in the tests of Examples 1 to 10 An electroplating line that is directly fed into the plating tank 6 without undergoing the dipping treatment is used, and the line speed is 12 to 2
Comparative examples 1 to 6 of Table 2 show the results of examining the electrolytic efficiency of the plated steel sheet, the unevenness of the amount of coating on the surface of the steel sheet, and the deterioration of the plating bath after plating was performed while changing the rate in the range of 10 m / min. Show. The measurement method and evaluation method of each item in the table are the same as those in Table 1. Further, in FIG. 4, the same reference numerals as those in FIG. 1 indicate the same configurations.
【００２４】いずれの例においても、電解効率が悪く、
めっき付着量ムラおよびめっき浴の劣化が認められた。
また、安定化時間は、ライン速度の増加に伴い減少し、
６０ｍ／分以上では約０．１秒と一定の値を示した。こ
のことは、１００％の電解効率を得るためには、めっき
前に約０．１秒間のめっき液浸漬時間が必要であること
を示している。In any of the examples, the electrolysis efficiency was poor,
Uneven coating amount and deterioration of the plating bath were observed.
Also, the stabilization time decreases as the line speed increases,
At a speed of 60 m / min or more, it showed a constant value of about 0.1 seconds. This indicates that a plating solution immersion time of about 0.1 seconds is required before plating in order to obtain 100% electrolytic efficiency.
【００２５】表２中の比較例７〜比較例１０は、比較例
１〜比較例６の試験で使用した電気めっきラインにおけ
るめっき槽の第１パス目では電極に通電せず、第２パス
目で通電、めっきを行ったときの結果である。めっき槽
の第１パス目に、本発明の方法におけるめっき前浸漬槽
の機能を行わせたことにより、いずれの例においても良
好な電解効率が得られ、めっき付着量ムラも認められな
かった。しかし、浸漬槽とめっき槽とが区分されていな
いために、いずれの例においてもめっき浴の劣化が認め
られた。In Comparative Example 7 to Comparative Example 10 in Table 2, the electrodes were not energized in the first pass of the plating tank in the electroplating line used in the tests of Comparative Examples 1 to 6, and the second pass was used. This is the result when electricity is applied and plating is performed. By performing the function of the pre-plating dipping bath in the method of the present invention in the first pass of the plating bath, good electrolysis efficiency was obtained in all the examples, and no uneven coating amount was observed. However, since the dipping bath and the plating bath were not separated, deterioration of the plating bath was observed in any of the examples.
【００２６】[0026]
【発明の効果】本発明の方法によれば、めっき槽の直前
にめっき槽と区分された、鋼板をめっき液に浸漬する槽
を設けることにより（例えばライン速度が６００ｍ／分
の場合、浸漬時間を０．６秒として、浸漬長さ６ｍのめ
っき前浸漬槽を設置する）、めっき槽を第１パス目から
有効に使用でき、高速操業時においても１００％の電解
効率を得ることができ、めっき付着量の高精度な制御が
可能になる。また、めっき付着量ムラが無いため、外観
の良い、耐食性に優れためっき鋼板を製造することがで
きる。さらに、めっき液の劣化が抑制され、長期間安定
した操業が可能になる。本発明の方法は、鋼板のめっき
液への浸漬を超音波照射下で行うことにより、いっそう
効果的となり、めっき前浸漬槽の長さを大幅に短縮する
ことができる。According to the method of the present invention, by providing a bath for immersing the steel sheet in the plating solution, which is separated from the plating bath immediately before the plating bath (for example, when the line speed is 600 m / min, the dipping time is Is set to 0.6 seconds, a pre-plating dipping bath with a dipping length of 6 m is installed), the plating bath can be effectively used from the first pass, and 100% electrolysis efficiency can be obtained even during high-speed operation, It is possible to control the amount of plating applied with high accuracy. Further, since there is no unevenness in the coating amount, it is possible to manufacture a plated steel sheet having a good appearance and excellent corrosion resistance. Further, deterioration of the plating solution is suppressed, and stable operation is possible for a long period of time. The method of the present invention becomes even more effective by immersing the steel sheet in the plating solution under ultrasonic irradiation, and the length of the dipping tank before plating can be greatly shortened.
【００２７】[0027]
【表１】 [Table 1]
【００２８】[0028]
【表２】 [Table 2]
【図１】本発明に係わる電気錫めっきラインを説明する
模式側面図。FIG. 1 is a schematic side view illustrating an electric tin plating line according to the present invention.
【図２】本発明に係わる電気錫めっきラインで、めっき
槽がラジアルセル型であるものを説明する模式側面図。FIG. 2 is a schematic side view illustrating an electric tin plating line according to the present invention in which a plating tank is a radial cell type.
【図３】本発明に係わる電気錫めっきラインで、めっき
槽が水平対向噴流セル型であるものを説明する模式側面
図。FIG. 3 is a schematic side view illustrating an electric tin plating line according to the present invention in which the plating tank is of a horizontally opposed jet cell type.
【図４】従来の方法に係わる電気錫めっきラインを説明
する模式側面図。FIG. 4 is a schematic side view illustrating an electric tin plating line according to a conventional method.
１：脱脂槽、２：水洗槽、３：酸洗槽、４：水洗槽、
５：浸漬槽、６：めっき槽、９：鋼帯、１１：陽極、１
３：超音波発信子。1: Degreasing tank, 2: Washing tank, 3: Pickling tank, 4: Washing tank,
5: Immersion tank, 6: Plating tank, 9: Steel strip, 11: Anode, 1
3: Ultrasonic transmitter.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 久保 啓 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kei Kubo Marunouchi 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd.
Claims (2)
工程と、この工程の後、鋼板に前記浸漬槽と区分された
めっき槽の中で電気錫めっきを施す工程とを備えたこと
を特徴とする電気錫めっき鋼板の製造方法。1. A method comprising: a step of immersing a steel sheet in a plating solution in a dipping bath; and, after this step, a step of electroplating the steel sheet in a plating bath separated from the dipping bath. A method for producing an electrotin-plated steel sheet, which comprises:
音波を照射しながら行う工程であることを特徴とする請
求項１に記載の電気錫めっき鋼板の製造方法。2. The method for producing an electrotin-plated steel sheet according to claim 1, wherein the step of immersing the steel sheet in a dipping tank is a step of irradiating ultrasonic waves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32075693A JPH07173673A (en) | 1993-12-21 | 1993-12-21 | Production of tin electroplated steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32075693A JPH07173673A (en) | 1993-12-21 | 1993-12-21 | Production of tin electroplated steel sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07173673A true JPH07173673A (en) | 1995-07-11 |
Family
ID=18124923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32075693A Pending JPH07173673A (en) | 1993-12-21 | 1993-12-21 | Production of tin electroplated steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07173673A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160109701A (en) * | 2015-03-12 | 2016-09-21 | 엘에스엠트론 주식회사 | Plating bath and plating device having the same |
-
1993
- 1993-12-21 JP JP32075693A patent/JPH07173673A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160109701A (en) * | 2015-03-12 | 2016-09-21 | 엘에스엠트론 주식회사 | Plating bath and plating device having the same |
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