JPH0735598B2 - Surface cleaning method for steel sheet - Google Patents
Surface cleaning method for steel sheetInfo
- Publication number
- JPH0735598B2 JPH0735598B2 JP60007603A JP760385A JPH0735598B2 JP H0735598 B2 JPH0735598 B2 JP H0735598B2 JP 60007603 A JP60007603 A JP 60007603A JP 760385 A JP760385 A JP 760385A JP H0735598 B2 JPH0735598 B2 JP H0735598B2
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- Japan
- Prior art keywords
- steel sheet
- treatment
- acid
- electrolysis
- treated
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- 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.)
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- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は鋼板の表面清浄化方法に関するもので、鋼板の
製造工程で不可避的に付着した汚染物や酸化皮膜を効率
良く除去し、外観を整えるとともに、かかる清浄化によ
り、鋼板の耐錆性と化成処理性を著しく向上させること
を目的とするものである。Description: TECHNICAL FIELD The present invention relates to a method for cleaning a surface of a steel sheet, which efficiently removes contaminants and oxide films adhered inevitably in the manufacturing process of the steel sheet to improve the appearance. The purpose is to improve the rust resistance and chemical conversion treatability of the steel sheet by such cleaning as well as the preparation.
（従来技術及びその問題点） 薄鋼板の表面には冷延鋼板、めっき鋼板を問わず、製造
上不可避的に酸化皮膜（即ち大気中の酸化、各種熱処理
中の雰囲気ガスの汚れ、加熱・冷却中の酸化、熱処理中
の内部成分の表面濃化、それらの混在によるもの、表面
処理等化学反応処理による酸化）と汚染物（大気中の異
物付着、各種製造上の残渣物等）で覆われており、それ
が表面の反応性に多大な影響を与えることは周知のとお
りである。(Prior art and its problems) Whether a cold-rolled steel sheet or a plated steel sheet is used on the surface of a thin steel sheet, an oxidative film (that is, oxidation in the atmosphere, contamination of atmospheric gas during various heat treatments, heating / cooling) is inevitable in manufacturing. Oxidation in the interior, surface concentration of internal components during heat treatment, due to their mixture, oxidation due to chemical reaction treatment such as surface treatment) and covered with contaminants (adhesion of foreign substances in the atmosphere, residues in various manufacturing processes, etc.) It is well known that it has a great influence on the reactivity of the surface.
たとえば、冷延鋼板の製造においては、焼鈍前の電解清
浄工程でのシリコン汚れ、焼鈍工程でのカーボン汚れ、
また鋼成分と焼鈍条件の不適正によるテンパーカラーな
どがある。これらはいずれも外観を著しく損なうばかり
でなく、需要家において化成処理後、塗装して使用され
るに際し、その性能を大きく劣化させるものである。For example, in the production of cold rolled steel sheet, silicon stains in the electrolytic cleaning process before annealing, carbon stains in the annealing process,
In addition, there are temper colors due to improper steel composition and annealing conditions. All of these not only impair the appearance remarkably, but also significantly deteriorate the performance of the products when they are used by coating after being subjected to chemical conversion treatment by consumers.
また、めっき鋼板においても、たとえば溶融めっき鋼板
においては、そのめっき鋼板は、高温加熱により厚い安
定な酸化皮膜で覆われており、化成皮膜に対して不利で
ある。さらに、電気めっき鋼板でも、めっき液の付着変
質残存による性能劣化などの問題が、近年の片面めっき
鋼板の需要増大ならびに合金めっき、複合めっき技術等
の進展にともない、急激にクローズアップされてきた。Further, in the case of a galvanized steel sheet, for example, a hot dip galvanized steel sheet, the galvanized steel sheet is covered with a thick and stable oxide film by heating at high temperature, which is disadvantageous to the chemical conversion film. Further, in electroplated steel sheets as well, problems such as performance deterioration due to residual adhesion and alteration of the plating solution have been rapidly highlighted with the recent increase in demand for single-sided plated steel sheets and the progress of alloy plating and composite plating technology.
従来かかる鋼板の表面清浄化に際しては、硫酸あるいは
塩酸等の強酸溶液に浸漬、また場合によって、さらに電
解により酸洗する方法が効率的であり、多く採用されて
きた。Conventionally, for cleaning the surface of such a steel sheet, a method of immersing in a strong acid solution such as sulfuric acid or hydrochloric acid and, in some cases, further performing electrolytic pickling is efficient and has been widely adopted.
しかしながら、これら強酸溶液による清浄化処理は次の
ような重大な欠点があった。However, the cleaning treatment with these strong acid solutions has the following serious drawbacks.
すなわち、酸洗は本来まず鋼板表面の酸化皮膜の溶解か
ら始まるが、その表面に汚染物が存在する場合、とりわ
けカーボンのような酸に対して不溶な汚染物がある場
合、汚染物を残して清浄部のみ溶解が進行し、またテン
パーカラーのごとくMn、Si等の特定元素の選択酸化膜が
形成されている場合、これらの元素の濃度分布に従っ
て、選択的に溶解が進行する現象がみられる。That is, pickling originally starts with the dissolution of the oxide film on the surface of the steel sheet, but if contaminants are present on the surface, especially if there are contaminants such as carbon that are insoluble in acid, leave the contaminants. If the dissolution progresses only in the clean area and a selective oxide film of specific elements such as Mn and Si is formed like temper color, there is a phenomenon that the dissolution progresses selectively according to the concentration distribution of these elements. .
したがって、これら強酸によって、酸洗された鋼板面
は、色調は回復しても、ミクロ的には溶解面はきわめて
不均一で、ポーラスな状態になり、光沢あるいは外観は
得られない。その程度は強酸であるほど顕著である。Therefore, even if the color tone of the steel sheet surface pickled by these strong acids is restored, the melting surface is microscopically extremely non-uniform and becomes porous, so that gloss or appearance cannot be obtained. The degree is more remarkable for the stronger acid.
またポーラスであるがゆえに酸洗後、充分に水洗を行な
っても、鋼板面に吸着したアニオンや酸洗時に鋼板面よ
り溶出した鉄、あるいは、金属イオンとそれらの塩は充
分には除去できず、さらにアルカリ中和を行なってもこ
れらは酸洗残渣を除去（清浄化）する効果はほとんどな
い。Further, since it is porous, even if it is sufficiently washed with water after pickling, the anions adsorbed on the surface of the steel sheet, iron eluted from the steel sheet surface during pickling, or metal ions and their salts cannot be sufficiently removed. Even if alkali neutralization is further performed, these have almost no effect of removing (cleaning) the pickling residue.
このように、従来の強酸溶液による清浄化処理では清浄
化といえども不可視レベルでは、かかる酸洗残渣がほと
んどそのまま残存した状態で仕上げられており、これに
より、塗油状態でもこの残渣を起点に早期に錆が発生し
たり、化成処理性を大きく劣化させるなど、品質性能の
回復は望めなかった。In this way, even if it is cleaned by the conventional cleaning treatment with a strong acid solution, at the invisible level, it is finished with such pickling residue remaining almost as it is, and this makes it the starting point from this residue even in the oiled state. Recovery of quality performance could not be expected, such as rust occurring early and deterioration of chemical conversion processability.
また操業面においても、これら強酸溶液による処理は安
全衛生や、廃液処理上等の問題があった。Also in terms of operation, the treatment with these strong acid solutions has problems in safety and hygiene and waste liquid treatment.
そこで、これら強酸を使用することから生じる諸問題を
回避し、弱酸ないし中性の溶液による清浄化処理が望ま
れるに至った。Therefore, various problems caused by using these strong acids have been avoided, and a cleaning treatment with a weak acid or a neutral solution has been desired.
弱酸〜中性溶液の場合、言うまでもなく単なる浸漬処理
では汚染物や酸化皮膜の除去能力は大きく劣るが、電解
処理すれば除去可能となる。In the case of a weak acid to a neutral solution, needless to say, the ability to remove contaminants and oxide films is greatly inferior by simple dipping treatment, but it can be removed by electrolytic treatment.
従来、本発明と目的は異なるが、強酸以外の溶液中で電
解処理する方法として、たとえば次のような方法があっ
た。Conventionally, although the purpose is different from that of the present invention, there has been, for example, the following method as an electrolytic treatment method in a solution other than a strong acid.
被処理用金属材を陽極または陰極として、これを硫酸
塩水溶液中に浸漬して電解する方法（特開昭53−73427
号）。A method in which a metal material to be treated is used as an anode or a cathode and is immersed in an aqueous solution of sulfate to electrolyze (Japanese Patent Laid-Open No. 53-73427).
issue).
片面亜鉛系電気めっき鋼板の非めっき面を対象に、硫
酸、塩酸、過塩素酸、炭酸、ホウ酸、硝酸の一種または
二種以上と、水酸化ナトリウム、水酸化カリウム、水酸
化アンモニウム、の一種または二種以上とからなるPH3
以上９未満の水溶液中にて陽極電流密度5A/dm2以上で電
解する方法（特開昭58−133395号）。One side or two or more types of sulfuric acid, hydrochloric acid, perchloric acid, carbonic acid, boric acid, nitric acid, and one type of sodium hydroxide, potassium hydroxide, ammonium hydroxide, for non-plated surface of single-sided zinc-based electroplated steel sheet Or PH3 consisting of two or more
A method of electrolyzing at an anode current density of 5 A / dm 2 or more in an aqueous solution of less than 9 (JP-A-58-133395).
しかしながら、これらの電解処理に使用させる溶液には
PH緩衝能がなく、電解にともなって、PHが急激に上昇す
ることになる。これにより、特にPH7以上では、水酸化
物の沈澱がきわめて激しくなり、その除去が困難なばか
りでなく、沈澱物が鋼板面に吸着し、逆に汚染されるな
どの欠点があり、本発明の目的とする清浄でかつ耐錆性
や化成処理性の優れた表面は得られなかった。However, the solution used for these electrolytic treatments
There is no PH buffering capacity, and the PH will rise sharply with electrolysis. As a result, especially at PH7 or above, precipitation of hydroxide becomes extremely intense and not only is difficult to remove, but there is a drawback that the precipitate is adsorbed on the steel plate surface and conversely contaminated. The desired clean surface with excellent rust resistance and chemical conversion treatability was not obtained.
（問題点を解決するための手段） 本発明者等は、弱酸〜中性溶液による電解処理法に焦点
を絞り、かかる欠点である電解にともなってのPH変化と
沈澱生成の抑制方法について鋭意検討を重ねた結果、オ
キシ・カルボン酸とその塩との混合溶液において、PH2
以上７未満の範囲で電解を行なった場合、これらの諸問
題は完全に解決され、あわせて被処理鋼板の耐錆性なら
びに化成処理性が飛躍的に向上することを見出し、本発
明を完成するに至ったものである。(Means for Solving Problems) The inventors of the present invention focused on an electrolytic treatment method using a weak acid to a neutral solution, and diligently studied a method of suppressing PH change and precipitation formation associated with electrolysis, which is such a drawback. As a result of repeating the above, in the mixed solution of oxycarboxylic acid and its salt, PH2
When electrolysis is carried out within the range of less than 7 above, these problems are completely solved, and in addition, the rust resistance and chemical conversion treatability of the steel sheet to be treated are dramatically improved, and the present invention is completed. It came to.
本発明による効果の詳細なメカニズムは明らかではない
が、まず、弱酸〜中性溶液による電解により、強酸溶液
を使用した場合のように不均一で過剰な溶解が避けら
れ、均一に、かつ平滑に表面が溶解されること、そし
て、本発明の電解溶液であるオキシ・カルボン酸と、そ
の塩との混合溶液がいずれも優れたPH緩衝作用を有し、
金属イオンと容易に水溶性のキレート化合物を生成する
性質を有することによる結果と考えられる。Although the detailed mechanism of the effect of the present invention is not clear, first, by electrolysis with a weak acid to a neutral solution, nonuniform and excessive dissolution as in the case of using a strong acid solution is avoided, and a uniform and smooth solution is obtained. That the surface is dissolved, and the mixed solution of oxycarboxylic acid, which is the electrolytic solution of the present invention, and its salt each has an excellent PH buffering effect,
It is considered to be a result of having a property of easily forming a water-soluble chelate compound with a metal ion.
たとえば、従来技術の一例に準じ、PHを３に調整した1.
0M硫酸ナトリウムと硫酸の混合溶液で、対極をステンレ
ス板とし、被処理鋼板を陽極および陰極として20A/dm2
の電流密度で連続電解を行なったときのPH変化を、同じ
くPHを３に調整した本発明の例のうち、0.1Mクエン酸ナ
トリウムとクエン酸の混合溶液で同条件で連続電解した
場合の結果と比較して第１図に示す。For example, according to an example of the prior art, PH was adjusted to 3.
20A / dm 2 of a mixed solution of 0M sodium sulfate and sulfuric acid, with a stainless steel plate as the counter electrode and a steel plate as the anode and cathode.
In the example of the present invention in which the PH was adjusted to 3, the change in PH when continuous electrolysis was performed at the current density of 10 was the result of continuous electrolysis under the same conditions with a mixed solution of 0.1 M sodium citrate and citric acid. It is shown in FIG.
第１図から明らかなように、硫酸ナトリウム＋硫酸混合
溶液では、連続電解に際し、早期に溶PHが上昇するのに
対し、本発明例のクエン酸ナトリウム＋クエン酸混合溶
液では、そのPH緩衝能により、ほとんど変化が認められ
ない。特に従来技術の陽極電解の場合、PH上昇が顕著で
あり、PH上昇にともなって硫酸ナトリウム＋硫酸混合溶
液では多量の沈澱物を生成する。As is clear from FIG. 1, in the sodium sulfate + sulfuric acid mixed solution, the dissolved PH increases early during continuous electrolysis, whereas in the sodium citrate + citric acid mixed solution of the present invention, its PH buffering capacity is increased. As a result, there is almost no change. Particularly, in the case of the conventional anodic electrolysis, the increase in PH is remarkable, and a large amount of precipitate is produced in the sodium sulfate + sulfuric acid mixed solution with the increase in PH.
すなわち、一般に電解処理においては、陽極界面ではAO
H-→2H2O＋O2＋4e-…なる反応により、酸素ガスを発
生し、PHの低下、ならびに金属の溶解（Ｍ→Mn+＋ne-）
が起り、陰極界面では2H+＋2C-→H2…なる反応によ
り、水素ガスを発生し、PHの上昇が起るものである。That is, in the electrolytic treatment, AO is generally used at the anode interface.
H - → 2H 2 O + O 2 + 4e - by ... made reaction to generate oxygen gas, a decrease in PH, and metal dissolution (M → M n + + ne -)
Is occurs, the cathode interface 2H + + 2C - by → H 2 ... made reaction generates hydrogen gas, in which rise of PH occurs.
いま、被処理鋼板を陽極とした場合、鋼板面の溶解が優
先され、の反応が律速となるため、陰極面における
の反応によるPH上昇に支配され、浴全体のPHが上昇する
ものと考えられる。Now, when the steel sheet to be treated is used as the anode, the dissolution of the steel sheet surface is prioritized, and the reaction of is the rate-determining, so it is considered that the PH of the entire bath is increased, which is governed by the PH increase due to the reaction of the cathode surface. .
これに対し、本発明におけるオキシ・カルボン酸とその
塩との混合溶液においては、まず、PH緩衝能により界面
ならびに浴全体のPHが安定に維持され、同時に、界面の
溶出した金属イオンが直ちにオキシカルボンと水溶液キ
レート化合物を形成し、これにより沈澱が抑制されるも
のと思われる（これに対し、たとえば上記例の硫酸ナト
リウム＋硫酸混合液のごとき従来浴では水酸化物その他
の塩として直ちに沈澱する）。On the other hand, in the mixed solution of the oxycarboxylic acid and its salt in the present invention, first, the PH of the interface and the entire bath are stably maintained by the PH buffering ability, and at the same time, the metal ions eluted at the interface are immediately oxidized. It seems that an aqueous solution chelate compound is formed with carvone, and thereby the precipitation is suppressed (in contrast, in a conventional bath such as the mixed solution of sodium sulfate + sulfuric acid in the above example, it is immediately precipitated as a hydroxide or other salt. ).
したがって、本発明の処理浴にて電解処理された被処理
物は、電解時に界面のPHが安定に維持され、これにより
均一な酸浴解が促され、同時に界面に溶出した金属イオ
ンが、水酸化物その他の塩として被処理面に沈澱あるい
は吸着することなく、直ちに水溶性キレート化合物とし
て浴中に拡散する。また、これにさらに弱酸〜中性溶液
の使用により、強酸の場合のようにポーラスでなく、平
滑な表面に仕上っていることも手伝って、かかる酸洗残
渣ならびに処理液は、その後の水洗でスムーズに被処理
面から除去され、このようにしてきわめて清浄で活性の
表面が得られるものと推定している。Therefore, the object to be treated that has been electrolytically treated in the treatment bath of the present invention, the PH of the interface is stably maintained during electrolysis, which promotes uniform acid bath dissolution, and at the same time the metal ions eluted at the interface are water. It does not precipitate or adsorb as an oxide or other salt on the surface to be treated, but immediately diffuses in the bath as a water-soluble chelate compound. In addition, by using a weak acid to neutral solution, it helps to finish on a smooth surface rather than a porous surface as in the case of a strong acid.The pickling residue and treatment solution are smoothed by subsequent washing with water. It is presumed that a very clean and active surface is thus obtained after being removed from the surface to be treated.
ただし、PH7以上では酸洗能力が減少し、また沈澱生成
を充分に抑制しきれず、またPH2未満では鋼板の不均一
な過剰溶解が急激に進行し、充分な清浄効果が得られな
い。したがって処理液のPHは、２以上７未満の範囲に調
整する必要がある。However, if it is PH7 or more, the pickling ability is reduced, and the precipitation formation cannot be sufficiently suppressed, and if it is less than PH2, the uneven dissolution of the steel sheet rapidly progresses, and a sufficient cleaning effect cannot be obtained. Therefore, it is necessary to adjust the pH of the treatment liquid to a range of 2 or more and less than 7.
また、本電解処理の浴組成や温度、電解電流密度、極性
（被処理鋼板を陽極とする陽極電解のみ、陰極とする陰
極電解のみ、陽極−陰極電解や陰極−陽極電解等両極性
で夫々行う場合等）、処理時間等の諸条件は、上記PHの
範囲であれば、被処理鋼板の表面清浄に応じて、外観を
整えるに必要な条件に調整すれば、あらゆる条件におい
て充分にその効果が発揮されることが判明している。Further, the bath composition and temperature of the present electrolytic treatment, electrolysis current density, polarity (only anodic electrolysis using the steel sheet to be treated as an anode, only cathodic electrolysis using the cathode, anodic-cathodic electrolysis or cathodic-anodic electrolysis are performed with ambipolarity, respectively. If the conditions such as treatment time are within the above-mentioned PH range, the effect can be sufficiently obtained under all conditions by adjusting to the conditions necessary for adjusting the appearance according to the surface cleaning of the steel sheet to be treated. It has been shown to be demonstrated.
（実施例） 実施例１ 焼鈍条件の不適性により、褐色の着色酸化皮膜、いわゆ
るテンパーカラーを発生した通常成分（C:0.004％,Si:
0.02％,Mn:0.20％）のアルミキルド鋼板を対象に、次の
条件により本発明による電解清浄化処理を行ない、従来
技術による処理と被処理鋼板の外観、耐錆性、化成処理
性を比較した。(Example) Example 1 Ordinary component (C: 0.004%, Si: which generated a brown colored oxide film, so-called temper color due to inadequacy of annealing conditions
0.02%, Mn: 0.20%) aluminum-killed steel plate was subjected to electrolytic cleaning treatment according to the present invention under the following conditions, and the appearance, rust resistance and chemical conversion treatment property of the treated steel sheet were compared with the conventional treatment. .
Ｉ電解処理 第１表の処理浴中で被処理鋼板を陽極として１秒、ひき
つづき陰極として１秒電解。このとき対極はステンレス
板を用い、電流密度は30A/dm2とした。I Electrolytic treatment In the treatment bath shown in Table 1, the treated steel sheet was electrolyzed for 1 second as an anode and subsequently for 1 second as a cathode. At this time, a stainless steel plate was used as the counter electrode, and the current density was 30 A / dm 2 .
II水洗 常温、流水条件で２秒 III乾燥 IV塗油 被処理鋼板の外観と耐錆性、化成処理性、の試験結果を
下記第１表に示す。II Washing with water for 2 seconds under normal temperature and running water III Drying IV oil Appearance, rust resistance and chemical conversion treatability of the treated steel sheet are shown in Table 1 below.
第１表から明らかなように、本発明によるオキシ・カル
ボン酸とその塩との混合溶液中で電解することにより、
鋼板の外観は従来方法以上に金属光沢を有した良好な外
観を呈し、かつ耐錆性、リン酸塩化成処理性が著しく良
好になった。As is clear from Table 1, by electrolysis in a mixed solution of an oxycarboxylic acid and a salt thereof according to the present invention,
The appearance of the steel sheet was better than that of the conventional method with a metallic luster, and the rust resistance and the phosphate conversion treatability were remarkably good.
特に、従来方法のの硫酸電解酸洗の場合、第２図の写
真に示すように、鋼板表面は不均一に過剰なエッジング
を受け、ポーラスになり、酸洗残渣がそのまま吸着残存
し、その結果、第３図に示すようにリン酸塩化成処理で
リン酸塩結晶が粗大化し、不均一で、一部、不生成の部
分がみられる。しかし、本発明法の〜では、いずれ
の処理条件でもこのような現象はみられず、第４図に示
すように、清浄な鋼板面を呈し、リン酸塩化成処理によ
り第５図のように緻密で良好なリン酸塩皮膜が形成され
ている。In particular, in the case of the sulfuric acid electrolytic pickling of the conventional method, as shown in the photograph of FIG. 2, the steel sheet surface is unevenly excessively edged and becomes porous, and the pickling residue remains adsorbed as it is. As shown in FIG. 3, the phosphate crystal is coarsened by the phosphate chemical conversion treatment, and non-uniformity and some non-generated portions are observed. However, in the methods of the present invention, such a phenomenon was not observed under any of the treatment conditions, and as shown in FIG. 4, a clean steel plate surface was exhibited, and as shown in FIG. A dense and good phosphate film is formed.
なお、比較例としてにPHが２以上７未満の範囲から
はずれた場合の結果を示した。PH2未満では着色酸化皮
膜は除去されるが、酸洗残渣より外観ならびに耐錆性、
化成処理性がやや劣化し、PH7以上では、酸洗能力の低
下で着色酸化皮膜を完全に除去することができなかっ
た。In addition, as a comparative example, the result when the PH is out of the range of 2 or more and less than 7 is shown. If it is less than PH2, the colored oxide film is removed, but the appearance and rust resistance from the pickling residue,
The chemical conversion treatability deteriorated a little, and at pH 7 or higher, the pickling ability was lowered and the colored oxide film could not be completely removed.
実施例２ 前述した第１図の結果が得られた実験のうち、本発明法
の実施に当たる例を第２実施例として説明する。Example 2 Of the experiments in which the results shown in FIG. 1 were obtained, an example for carrying out the method of the present invention will be described as a second example.
その処理方法は、浴組成30g/1（0.1M）クエン酸ナトリ
ウムとクエン酸のpH3.0の混合溶液中で被処理鋼板を陽
極としてのみ用い、20A/dm2で２秒間電解処理した第１
図陽極電解（）の場合と、同処理溶液中で被処理鋼板
を陰極としてのみ用い、同じく20A/dm2で２秒間電解処
理した同図陰極電解（）の場合の２つの方法を実施し
た。こうして得られた被処理鋼板の外観と、耐錆性、化
成処理性の試験結果を下記第２表に示す。The treatment method is as follows: Bath composition 30g / 1 (0.1M) In a mixed solution of sodium citrate and citric acid at pH 3.0, the steel sheet to be treated is used only as an anode, and electrolytic treatment is performed at 20A / dm 2 for 2 seconds.
Two methods were carried out: in the case of anode electrolysis () in the figure, and in the case of cathode electrolysis () in the figure, in which the steel sheet to be treated was used only as a cathode in the same treatment solution and electrolytically treated at 20 A / dm 2 for 2 seconds. The appearance of the steel sheet to be treated thus obtained, and the test results of rust resistance and chemical conversion treatability are shown in Table 2 below.
この第２表から明らかなように、陽極電解だけ又は陰極
電解だけでも、鋼板の外観は金属光沢を有する良好な外
観を呈し、且つ耐錆性、リン酸塩化成処理性の点でも優
れた結果が得られた。As is clear from Table 2, the appearance of the steel sheet shows a good appearance with metallic luster even by anodic electrolysis alone or cathodic electrolysis alone, and is also excellent in terms of rust resistance and phosphate chemical conversion treatment. was gotten.
（効果） 以上の実施例から明らかなように、本発明の表面清浄化
方法によれば、鋼板の製造過程で不可避的に付着した汚
染物や酸化皮膜が効率よく除去され、外観が整えられる
とともに、鋼板の耐錆性と化成処理性が著しく向上する
ことになる。 (Effect) As is apparent from the above examples, according to the surface cleaning method of the present invention, contaminants and oxide films inevitably adhered during the manufacturing process of the steel sheet are efficiently removed and the appearance is adjusted. The rust resistance and chemical conversion treatability of the steel sheet will be significantly improved.
なお、本発明はめっき鋼板の製造に際し、めっきの前処
理として、また溶融めっき鋼板のめっき表面の酸化膜除
去や、電気めっき鋼板のめっき後の非めっき面、ならび
にめっき面の後処理（表面清浄化処理）としても利用で
きる。Incidentally, the present invention, in the production of plated steel sheet, as a pretreatment for plating, and also for removing an oxide film on the plated surface of the hot dip plated steel sheet, a non-plated surface after plating of an electroplated steel sheet, and a post-treatment of the plated surface (surface cleaning It can also be used as
第１図は本発明法と比較例の電解時間とPHの関係を示し
たグラフ、第２図〜第５図はいずれも鋼板表面の結晶構
造を示す写真であり、第２図は従来の硫酸電解処理後の
状態、第３図は同じく従来のリン酸塩化成処理後の状態
を示し、第４図は本発明法による清浄処理後の状態、第
５図は同じく本発明におけるリン酸塩化成処理後の状態
を示すものである。FIG. 1 is a graph showing the relationship between electrolysis time and PH of the method of the present invention and a comparative example, FIGS. 2 to 5 are photographs showing the crystal structure of the steel sheet surface, and FIG. 2 is a conventional sulfuric acid. The state after the electrolytic treatment, FIG. 3 shows the state after the conventional phosphate chemical conversion treatment, FIG. 4 shows the state after the cleaning treatment by the method of the present invention, and FIG. 5 shows the phosphate chemical conversion according to the present invention. It shows a state after processing.
Claims (1)
酸塩とからなり、その配合割合でpHを２〜７に調整した
混合溶液で鋼板を電解洗浄することを特徴とした鋼板の
表面清浄方法。1. A method for cleaning a surface of a steel sheet, which comprises electrolytically cleaning the steel sheet with a mixed solution comprising oxycarboxylic acid and oxycarboxylic acid salt, the pH of which is adjusted to 2 to 7 in a mixing ratio thereof. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60007603A JPH0735598B2 (en) | 1985-01-21 | 1985-01-21 | Surface cleaning method for steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60007603A JPH0735598B2 (en) | 1985-01-21 | 1985-01-21 | Surface cleaning method for steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61166999A JPS61166999A (en) | 1986-07-28 |
| JPH0735598B2 true JPH0735598B2 (en) | 1995-04-19 |
Family
ID=11670374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60007603A Expired - Lifetime JPH0735598B2 (en) | 1985-01-21 | 1985-01-21 | Surface cleaning method for steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0735598B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61167000A (en) * | 1985-01-21 | 1986-07-28 | Nippon Kokan Kk <Nkk> | Removing method of oxide film from continuously annealed steel strip |
| JPH0577087U (en) * | 1992-03-30 | 1993-10-19 | 東海ゴム工業株式会社 | Powder crosslinking prevention device |
| JP5463774B2 (en) * | 2009-07-22 | 2014-04-09 | 株式会社オートネットワーク技術研究所 | Method for removing Sn oxide film formed on Sn-based plating material surface |
| JP5891845B2 (en) * | 2012-02-24 | 2016-03-23 | Ｊｆｅスチール株式会社 | Manufacturing method of surface-treated steel sheet |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61167000A (en) * | 1985-01-21 | 1986-07-28 | Nippon Kokan Kk <Nkk> | Removing method of oxide film from continuously annealed steel strip |
-
1985
- 1985-01-21 JP JP60007603A patent/JPH0735598B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61166999A (en) | 1986-07-28 |
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