JPH0257698A - Method for plating stainless material with chromium - Google Patents
Method for plating stainless material with chromiumInfo
- Publication number
- JPH0257698A JPH0257698A JP20788088A JP20788088A JPH0257698A JP H0257698 A JPH0257698 A JP H0257698A JP 20788088 A JP20788088 A JP 20788088A JP 20788088 A JP20788088 A JP 20788088A JP H0257698 A JPH0257698 A JP H0257698A
- Authority
- JP
- Japan
- Prior art keywords
- plating
- stainless steel
- chromium plating
- polarity
- steel material
- 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
- 238000007747 plating Methods 0.000 title claims abstract description 78
- 239000000463 material Substances 0.000 title claims abstract description 44
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims description 53
- 229910052804 chromium Inorganic materials 0.000 title claims description 40
- 239000011651 chromium Substances 0.000 title claims description 40
- 238000000034 method Methods 0.000 title claims description 27
- 229910001220 stainless steel Inorganic materials 0.000 claims description 36
- 239000010935 stainless steel Substances 0.000 claims description 36
- 238000011282 treatment Methods 0.000 claims description 28
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 238000009713 electroplating Methods 0.000 abstract description 2
- 238000001994 activation Methods 0.000 description 15
- 230000004913 activation Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 230000002265 prevention Effects 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 238000013020 steam cleaning Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- UOCLXMDMGBRAIB-UHFFFAOYSA-N 1,1,1-trichloroethane Chemical compound CC(Cl)(Cl)Cl UOCLXMDMGBRAIB-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 150000001844 chromium Chemical class 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
「技術分野」
本発明は、ステンレス材料に対して電気クロムめっきを
施す方法に関する。DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a method of applying electrochromium plating to stainless steel materials.
「従来技術およびその問題点」
ステンレス材料はめつき等の表面処理を施さなくとも一
般的に優れた外観を有するが、例えば車両のモールディ
ングとして使用する際に隣接する他のモールディングと
の色調を合わせるために、あるいは防錆性および耐食性
をさらに向上させるために、さらにクロムめっきを施す
ことがある。"Prior art and its problems" Stainless steel materials generally have an excellent appearance even without surface treatment such as plating, but when used as a molding for a vehicle, for example, it is necessary to match the color tone with other adjacent moldings. Alternatively, chromium plating may be applied to further improve rust prevention and corrosion resistance.
このステンレス材料に対するクロムめっきは従来１次の
手順によって行なわれてきた。Conventionally, chromium plating on this stainless steel material has been performed by a first step procedure.
すなわち先ず表面を洗浄するために、例えばトリクロル
エタンによる蒸気洗浄（洗浄処理）を行ない１次に、こ
れを活性化槽に入れ、酸等の薬品による処理を行なって
活性化する。活性化とは、ステンレス表面に形成されて
いる。クロムめっきの密着を阻害する不動態皮膜（酸化
皮膜）を除去する処理をいう、この活性化処理の終了し
たステンレス材料は次にクロムめっき槽に入れてクロム
めっきされる。この活性化処理は電気的負荷をかけない
で酸等の薬品処理を行ない、めっき処理においては、通
常ステンレス材料を一極に、めっき液を子種にして行な
う。That is, first, in order to clean the surface, steam cleaning (cleaning treatment) is performed using, for example, trichloroethane, and then this is placed in an activation tank and activated by treatment with a chemical such as acid. Activation is formed on the stainless steel surface. After this activation process, which is a process to remove a passive film (oxide film) that inhibits the adhesion of chrome plating, the stainless steel material is then placed in a chrome plating bath and chrome plated. This activation treatment is performed by chemical treatment such as acid without applying an electrical load, and in plating treatment, the stainless steel material is usually used as a pole and the plating solution is used as a seed.
この従来のクロムめっき処理方法は、活性化槽からめっ
き檀にステンレス材料を移す際に、ステンレス材料が一
旦空気に触れることが避けられない、ところが活性化処
理の済んだステンレス材料が空気に触れると、ステンレ
ス材料が活性化されているために、その表面に僅かでは
あるが、再び不動態皮膜が形成され、この不動態皮膜が
クロムめっきの付着を妨げることが見出された。このた
め、クロムめっきの付着性が悪化し、長期の使用によっ
て部分的に剥離したり、防錆性、耐食性が悪化する。In this conventional chrome plating method, when transferring the stainless steel material from the activation tank to the plating plate, it is inevitable that the stainless steel material will come into contact with the air. It was discovered that because the stainless steel material is activated, a passivation film is again formed on its surface, albeit slightly, and this passivation film prevents the adhesion of chromium plating. As a result, the adhesion of the chromium plating deteriorates, causing partial peeling due to long-term use, and deterioration of rust prevention and corrosion resistance.
「発明の目的」
本発明は、ステンレス材料に施すクロム電気めっきにつ
いての以上の問題点の発見に基づき、活性化処理からめ
っき処理に移行する際に不動態皮膜が形成されず、従２
て、ステンレス材料とクロムめっきとの付着性の悪化の
ないクロムめっき方法を得ることを目的とする。``Object of the Invention'' The present invention is based on the discovery of the above-mentioned problems regarding chromium electroplating applied to stainless steel materials.
It is an object of the present invention to provide a chromium plating method that does not cause deterioration in the adhesion between stainless steel materials and chromium plating.
「発明の概要」
本発明は、クロムめっき処理は電解処理の一種であると
ころ、クロムめっき液中において、クロムめっき時と逆
の極性で電解処理を施すと、活性化処理ができることを
見出して本発明を完成したものである。"Summary of the Invention" The present invention was developed based on the discovery that chromium plating treatment is a type of electrolytic treatment, and that activation treatment can be achieved by performing electrolytic treatment in a chromium plating solution with the opposite polarity to that used for chromium plating. It is a completed invention.
すなわち本発明によるクロムめっき方法は、洗浄処理の
済んだステンレス材料をクロムめっき液中に浸漬し、こ
のクロムめっき液中において、クロムめっき時とは逆の
極性で電解処理を施し、その後、クロムめっきを施すこ
とを特徴とするステンレス材料のクロムめっき方法であ
る。That is, in the chromium plating method according to the present invention, a stainless steel material that has been cleaned is immersed in a chromium plating solution, electrolytically treated in the chromium plating solution with the opposite polarity to that used for chrome plating, and then chromium plating is performed. This is a chromium plating method for stainless steel materials.
この方法によると、ステンレス材料の活性化処理とめっ
き処理との間において、ステンレス材料が空気に触れる
ことがなく、めっき処理の前に再び不動態皮膜が形成さ
れるおそれは皆無である。According to this method, the stainless steel material is not exposed to air between the activation process and the plating process, and there is no possibility that a passive film will be formed again before the plating process.
よって不動態皮膜の存在を理由として、ステンレス材料
とクロムめっきとの付着性が悪化することはない。Therefore, the presence of the passive film does not deteriorate the adhesion between the stainless steel material and the chromium plating.
「発明の実施例Ｊ
以下図示実施例について本発明を説明する。第１図は本
発明によるクロムめっき処理の工程を示すブロック図で
あり、第２図は対照として示す従来のクロムめっき処理
の工程を示すブロック図である。クロムめっきを施すべ
きステンレス材料Ｓは、洗浄処理工程１１において１例
えばトリクロルエクンの蒸気洗浄を受け、次に活性化・
めっき工程１２において、第３図に模式的に示すクロム
めっき槽１３内に入れられる。クロムめっき槽１３内の
クロムめっき液（電解液）１４は、クロム酸液を主剤と
し、少量の硫酸を含む周知のものである。Embodiment J of the Invention The present invention will be explained below with reference to the illustrated embodiments. Fig. 1 is a block diagram showing the process of chromium plating according to the present invention, and Fig. 2 is a conventional process of chrome plating shown as a comparison. FIG. 2 is a block diagram showing a stainless steel material S to be chromium plated. In a cleaning treatment step 11, the stainless steel material S is subjected to steam cleaning with, for example, trichloroequune, and then activated and
In the plating step 12, it is placed in a chrome plating tank 13 schematically shown in FIG. The chromium plating solution (electrolyte) 14 in the chromium plating tank 13 is a well-known solution that has a chromic acid solution as its main ingredient and contains a small amount of sulfuric acid.
本発明は、このクロムめっき槽１３内において、ステン
レス材料Ｓにクロムめっき時とは逆の極性によって逆電
解処理を施し、次にクロムめっき処理を施すのである。In the present invention, in this chromium plating tank 13, the stainless steel material S is subjected to a reverse electrolytic treatment using a polarity opposite to that used for chromium plating, and then chromium plating treatment is performed.
逆電解処理は、ステンレス材Ｉ４ Ｓを子種とし、クロ
ムめっき液１４を一極として行ない、めっき処理は、周
知のようにステンレス材料Ｓを一極とし、クロムめっき
液１４を子種として行なう、この極性の反転のために、
電源２０には極性反転器２１を付設する。The reverse electrolytic treatment is performed using the stainless steel material I4S as the seed and the chromium plating solution 14 as the single pole, and the plating process is performed as well known, using the stainless steel material S as the single pole and the chrome plating solution 14 as the base. Because of this polarity reversal,
A polarity inverter 21 is attached to the power supply 20.
逆電解処理は、活性化処理であり、ステンレス材料Ｓの
表面に形成されている不動態皮膜を除去することができ
ることが本発明者によって確認された。第４図は、不動
態皮膜の除去を効果的に行なうための液温（左縦軸）、
処理時間（横軸）、および電流密度（右縦軸）の一つの
関係例を示したもので、斜線の範囲が最適条件である。The reverse electrolytic treatment is an activation treatment, and the inventors have confirmed that the passive film formed on the surface of the stainless steel material S can be removed. Figure 4 shows the liquid temperature (left vertical axis) for effective removal of the passive film;
An example of the relationship between processing time (horizontal axis) and current density (right vertical axis) is shown, and the shaded range is the optimum condition.
この最適条件を外れると、不動態皮膜の除去が不完全に
なったり、逆に活性化されたステンレス材料の表面に、
金属不純物（Ｃ，Ｓｉ、Ｍｏ、Ｍｎ等）が発生するとと
もに、表面粗度が大きくなり過ぎ、後に付着するクロム
めっきの外観、付着性が悪くなる。If this optimum condition is not met, the removal of the passive film may be incomplete, or conversely, the surface of the activated stainless steel material may be damaged.
Metal impurities (C, Si, Mo, Mn, etc.) are generated, and the surface roughness becomes too large, resulting in poor appearance and adhesion of the chromium plating that will be deposited later.
この活性化処理が終了したら、極性反転器２１によって
ステンレス材料Ｓとクロムめっき液１４の極性を反転し
て電気クロムめっきを行なう。この反転は電気的に瞬時
に行なうことができる。ステンレス材料Ｓの表面に必要
厚さのクロムめっきが形成されたら、電解電流を断ち、
クロムめっき槽１３からステンレス材料Ｓを取り出す。After this activation process is completed, the polarity of the stainless steel material S and the chromium plating solution 14 is reversed by the polarity inverter 21, and electrochromium plating is performed. This reversal can be performed electrically and instantaneously. When the required thickness of chromium plating is formed on the surface of the stainless steel material S, the electrolytic current is cut off,
The stainless steel material S is taken out from the chromium plating tank 13.
このようにして、同一のクロムめっき槽１３の中におい
て、クロムめっき液１４に浸漬したままステンレス材料
Ｓに対して活性化処理とめっき処理を行なう本発明方法
によれば、活性化処理とめっき処理の間において、ステ
ンレス材料Ｓが空気に触れることはありえず、よって空
気に触れることによる酸化皮膜（不動態皮膜）の形成も
ない、従って、ステンレス材料Ｓとクロムめっきの付着
性を最高の状態に高めることができる。In this way, according to the method of the present invention in which the activation treatment and the plating treatment are performed on the stainless steel material S while immersed in the chromium plating solution 14 in the same chromium plating bath 13, the activation treatment and the plating treatment During this time, it is impossible for stainless steel material S to come into contact with air, and therefore no oxide film (passive film) is formed due to contact with air. Therefore, the adhesion between stainless steel material S and chrome plating is maximized. can be increased.
第２図の従来の工程では、洗浄処理工程１１を経たステ
ンレス材料Ｓは、活性化工程１６において不動態皮膜を
除去され、−旦空気に触れた後、めっき処理工程１７に
至る。空気に触れたとき、再び不動態皮膜が形成される
ため、クロムめっきの付着性が悪化するのである。In the conventional process shown in FIG. 2, the stainless steel material S that has passed through the cleaning process 11 has its passive film removed in the activation process 16, and after being exposed to air, it goes to the plating process 17. When exposed to air, a passive film is formed again, which deteriorates the adhesion of chrome plating.
「発明の効果」
以上のように本発明によるステンレス材料のクロムめっ
き方法は、従来、別々の槽で行なっていた活性化処理と
めっき処理を、クロムめっき液を有する単一のめっき槽
において極性を反転して行なう二つの電解処理、つまり
逆電解処理とめっき処理とで行なうことができる。よっ
て活性化処理とめっき処理との間でステンレス材料が空
気に触れることはありえず、空気に触れることに起因す
る不動態皮膜の形成がない、このためステンレス材料と
クロムめっきとの付着性が高まり、クロムめっきによる
防錆性および耐食性の効果を十分に発揮することができ
る。``Effects of the Invention'' As described above, the method for chromium plating stainless steel materials according to the present invention replaces the activation treatment and plating treatment, which were conventionally performed in separate tanks, with polarization in a single plating tank containing a chrome plating solution. It can be performed by two electrolytic treatments that are performed in reverse, that is, a reverse electrolytic process and a plating process. Therefore, it is impossible for the stainless steel material to come into contact with air between the activation treatment and the plating treatment, and there is no formation of a passive film caused by exposure to air, which increases the adhesion between the stainless steel material and the chrome plating. , the rust prevention and corrosion resistance effects of chromium plating can be fully demonstrated.
第１図は本発明によるステンレス材料のクロムめっき方
法の工程を示すブロック図、第２図は従来のそれの工程
を示すブロック図、第３図はクロムめっき槽における逆
電解処理とめっき処理の概念図、第４図は逆電解処理の
最適条件の一例を示す図である。
１１・・・洗浄処理工程、１２・・・活性化・めっき工
程、１３・・・クロムめっき槽、１４・・・クロムめっ
き液、２０・・・電源、２１・・・極性反転器、Ｓ・・
・ステンレス材料。Figure 1 is a block diagram showing the process of the chromium plating method for stainless steel materials according to the present invention, Figure 2 is a block diagram showing the conventional process, and Figure 3 is the concept of reverse electrolytic treatment and plating treatment in a chrome plating tank. 4 are diagrams showing an example of optimal conditions for reverse electrolytic treatment. DESCRIPTION OF SYMBOLS 11...Cleaning process, 12...Activation/plating process, 13...Chromium plating tank, 14...Chromium plating solution, 20...Power source, 21...Polarity inverter, S.・
・Stainless steel material.
Claims (1)
中に浸漬し、このクロムめっき液中に浸漬したまま、ク
ロムめっき処理時とは逆の極性による逆電解処理と、ク
ロムめっき処理とを施すことを特徴とするステンレス材
料のクロムめっき方法。(1) The cleaned stainless steel material is immersed in a chromium plating solution, and while immersed in the chrome plating solution, reverse electrolytic treatment using the opposite polarity to that during chromium plating and chromium plating are performed. A chromium plating method for stainless steel materials characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20788088A JPH0257698A (en) | 1988-08-22 | 1988-08-22 | Method for plating stainless material with chromium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20788088A JPH0257698A (en) | 1988-08-22 | 1988-08-22 | Method for plating stainless material with chromium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0257698A true JPH0257698A (en) | 1990-02-27 |
Family
ID=16547088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20788088A Pending JPH0257698A (en) | 1988-08-22 | 1988-08-22 | Method for plating stainless material with chromium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0257698A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001329393A (en) * | 2000-05-17 | 2001-11-27 | Nippon Steel Corp | METHOD FOR MANUFACTURING Ni-Cr PLATED STEEL SHEET |
| US6972146B2 (en) | 2002-03-15 | 2005-12-06 | Canon Kabushiki Kaisha | Structure having holes and method for producing the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53102840A (en) * | 1977-02-21 | 1978-09-07 | Mitsubishi Heavy Ind Ltd | Preliminarily treating method for diffusion welding of stainless steel, aluminum or aluminum alloy |
| JPS61201800A (en) * | 1985-03-04 | 1986-09-06 | Nippon Kokan Kk <Nkk> | Manufacture of cr plated roll for rolling |
-
1988
- 1988-08-22 JP JP20788088A patent/JPH0257698A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53102840A (en) * | 1977-02-21 | 1978-09-07 | Mitsubishi Heavy Ind Ltd | Preliminarily treating method for diffusion welding of stainless steel, aluminum or aluminum alloy |
| JPS61201800A (en) * | 1985-03-04 | 1986-09-06 | Nippon Kokan Kk <Nkk> | Manufacture of cr plated roll for rolling |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001329393A (en) * | 2000-05-17 | 2001-11-27 | Nippon Steel Corp | METHOD FOR MANUFACTURING Ni-Cr PLATED STEEL SHEET |
| US6972146B2 (en) | 2002-03-15 | 2005-12-06 | Canon Kabushiki Kaisha | Structure having holes and method for producing the same |
| US7214418B2 (en) | 2002-03-15 | 2007-05-08 | Canon Kabushiki Kaisha | Structure having holes and method for producing the same |
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