JPH0565697A - Surface treatment of stainless steel, surface-treated stainless steel and gasket - Google Patents
Surface treatment of stainless steel, surface-treated stainless steel and gasketInfo
- Publication number
- JPH0565697A JPH0565697A JP22327391A JP22327391A JPH0565697A JP H0565697 A JPH0565697 A JP H0565697A JP 22327391 A JP22327391 A JP 22327391A JP 22327391 A JP22327391 A JP 22327391A JP H0565697 A JPH0565697 A JP H0565697A
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- Prior art keywords
- stainless steel
- treated
- film
- treatment
- iron
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は主にオーステナイト系ス
テンレス鋼表面を陰極とし、溶液中において電気化学的
処理を行ない、その表面に形成された皮膜により塗料お
よび接着剤のぬれ性を向上させ、塗装性、接着性を飛躍
的に向上させる表面処理、表面処理されたステンレス
鋼、及びこのステンレス鋼を利用したガスケットに関す
る。BACKGROUND OF THE INVENTION The present invention mainly uses an austenitic stainless steel surface as a cathode, performs an electrochemical treatment in a solution, and improves the wettability of a paint and an adhesive by a film formed on the surface, The present invention relates to a surface treatment that dramatically improves paintability and adhesiveness, surface-treated stainless steel, and a gasket using the stainless steel.
【０００２】[0002]
【従来の技術】米国特許第３６４２５８６号は、溶液中
でフェライト系ステンレス鋼を陽極電解処理することに
より塗装性の向上を図る方法を開示している。しかし、
この方法では、オーステナイト系ステンレス鋼を陽極電
解処理した場合に、このステンレス鋼が含有しているニ
ッケルにより反応が抑制され、ステンレス鋼表面に水和
酸化物皮膜が生成されない。このため、表面処理された
ステンレス鋼のぬれ性の向上が顕著ではなく、塗装性の
向上が認められない。2. Description of the Related Art U.S. Pat. No. 3,642,586 discloses a method for improving paintability by subjecting a ferritic stainless steel to an anodic electrolytic treatment in a solution. But,
According to this method, when austenitic stainless steel is subjected to anodic electrolytic treatment, the reaction is suppressed by nickel contained in the stainless steel, and a hydrated oxide film is not formed on the stainless steel surface. Therefore, the wettability of the surface-treated stainless steel is not significantly improved, and the paintability is not improved.
【０００３】[0003]
【発明が解決しようとする技術的課題】本発明の目的
は、公害上の問題がなく、オーステナイト系ステンレス
鋼においても塗料の密着性の向上および接着性の向上を
図ることができるステンレス鋼の表面処理方法、この表
面処理を適用したステンレス鋼、及びこのステンレス鋼
を使用したガスケットを提供することにある。DISCLOSURE OF THE INVENTION The object of the present invention is to provide a surface of a stainless steel which has no pollution problem and which can improve the adhesion and the adhesion of a paint even in an austenitic stainless steel. It is intended to provide a treatment method, stainless steel to which this surface treatment is applied, and a gasket using this stainless steel.
【０００４】[0004]
【課題を解決する手段】上記目的を達成するために、本
発明の表面処理方法は、ステンレス鋼表面をアルカリ溶
液中で陰極電解処理して鉄系水和酸化物を主体とする皮
膜を形成する。In order to achieve the above object, in the surface treatment method of the present invention, the surface of stainless steel is subjected to cathodic electrolytic treatment in an alkaline solution to form a film mainly containing iron-based hydrated oxide. ..
【０００５】表面処理されるステンレス鋼は、フェライ
ト系、オーステナイト系など任意のステンレス鋼に適用
できる。特にオーステナイト系ステンレス鋼に有意義で
ある。一般に本発明の表面処理がなされるステンレス鋼
は、予め表面仕上げがなされているが、そのの表面仕上
げはＢＡ、２Ｂ、その他任意のものでよい。The surface-treated stainless steel can be applied to any stainless steel such as ferritic stainless steel and austenitic stainless steel. It is especially meaningful for austenitic stainless steel. Generally, the surface-treated stainless steel of the present invention is preliminarily surface-finished, but the surface-finish may be BA, 2B or any other surface finish.
【０００６】表面処理用のアルカリ溶液は、好適な例を
挙げれば、０．２〜５０重量％水酸化ナトリウムを含む
溶液、又は０．２〜５０重量％水酸化ナトリウムに０．
２〜２０重量％のリン酸三ナトリウム１２水塩、０．２
〜２０重量％の炭酸ナトリウムを加えた緩衝水溶液であ
る。好適な液温は２０℃〜９５℃、好適な電流密度は
０．５Ａ／ｄｍ2 以上、好適な処理時間は１０秒以上で
ある。上記条件の範囲が好ましい理由は、０．２重量％
未満の水酸化ナトリウム、０．２重量％未満のリン酸三
ナトリウム、０．２重量％未満の炭酸ナトリウムではス
テンレス鋼板の表面に均一な有効皮膜が得られにくく、
ステンレス鋼板の塗装性、接着性の向上が得られないた
めである。また、上限を越えると液の劣化が著しく、ま
た、経済的にも不利なためである。液温は２０℃未満で
は塗装性、接着性の向上の効果が小さく、液温を上げる
ことにより処理時間の短縮、消費電力が軽減される利点
があるが、９５℃以上では液濃度の管理が難しいためで
ある。また、電流密度０．５Ａ／ｄｍ2 以下、処理時間
１０秒以下では塗装性、接着性の向上の効果が小さい。
陰極電解処理に使用する対極はニッケル含有量が３重量
％未満の鉄系材料で、例えば鉄、フェライト系ステンレ
ス鋼である。A suitable example of the alkaline solution for surface treatment is a solution containing 0.2 to 50% by weight of sodium hydroxide or 0.2 to 50% by weight of sodium hydroxide.
2-20 wt% trisodium phosphate dodecahydrate, 0.2
It is a buffered aqueous solution containing ˜20 wt% sodium carbonate. A suitable liquid temperature is 20 ° C. to 95 ° C., and a suitable current density is 0.5 A / dm 2. As described above, the preferable processing time is 10 seconds or more. The reason why the range of the above conditions is preferable is 0.2% by weight.
Less than 0.2% by weight of sodium hydroxide, less than 0.2% by weight of trisodium phosphate, less than 0.2% by weight of sodium carbonate, it is difficult to obtain a uniform effective film on the surface of the stainless steel sheet.
This is because the paintability and adhesiveness of the stainless steel sheet cannot be improved. Further, when the content exceeds the upper limit, the liquid is significantly deteriorated and it is economically disadvantageous. If the liquid temperature is lower than 20 ° C, the effect of improving the paintability and adhesiveness is small, and increasing the liquid temperature has the advantage of shortening the processing time and reducing the power consumption. Because it is difficult. The current density is 0.5 A / dm 2 Below, when the treatment time is 10 seconds or less, the effect of improving the paintability and adhesiveness is small.
The counter electrode used in the cathodic electrolysis treatment is an iron-based material having a nickel content of less than 3% by weight, such as iron or ferritic stainless steel.
【０００７】この様に処理されたフェライト系ステンレ
ス鋼は、表面に鉄系の水和酸化物を主体とする皮膜が形
成される。また対極の成分にクロムが含まれる場合など
には、鉄系の水和酸化物とともにクロム系の水和酸化物
が形成される。この皮膜の膜厚は数百オングストローム
から数千オングストロームである。The ferritic stainless steel treated in this manner has a film mainly composed of iron-based hydrated oxide formed on the surface. When chromium is contained in the counter electrode component, chromium-based hydrated oxide is formed together with iron-based hydrated oxide. The film thickness of this film is several hundred angstroms to several thousand angstroms.
【０００８】この様にして鉄系の水和化合物を形成した
ステンレス鋼に塗膜を形成した後、各種用途、例えばガ
スケットに使用される。塗膜に使用する塗料は基材との
密着性の観点から主にエポキシ−アクリル、シリコン−
アクリル、エポキシ−ポリエステル、シリコン−ポリエ
ステル等の変成アクリル系あるいは変成ポリエステル系
の塗料が好ましい。After the coating film is formed on the stainless steel on which the iron-based hydrated compound is formed in this manner, it is used for various purposes, for example, gaskets. The paint used for the coating film is mainly epoxy-acryl, silicone-from the viewpoint of adhesion to the substrate.
Modified acrylic or modified polyester paints such as acrylic, epoxy-polyester, and silicone-polyester are preferred.
【０００９】[0009]
【作用】本発明方法によれば、処理対象となるステンレ
ス鋼を陰極にて電解処理することにより塗料との密着性
の良好な皮膜が得られる。本発明による陰極電解処理に
より陽極より溶出した鉄を主体とするイオンを陰極表面
に水和酸化物皮膜として電着させ、同時に電解処理時に
発生する水素ガスにより鋼の表面が脱脂される。ステン
レス鋼表面に形成された皮膜は、塗料および接着剤のぬ
れ性が高く、塗装性、接着性を飛躍的に向上する。従っ
て、この表面処理鋼板に塗膜を形成したものはガスケッ
ト等に使用した場合、極めて優れた特性を有する。According to the method of the present invention, the stainless steel to be treated is electrolytically treated at the cathode to obtain a film having good adhesion to the coating material. Ions mainly composed of iron eluted from the anode by the cathodic electrolysis treatment according to the present invention are electrodeposited as a hydrated oxide film on the cathode surface, and at the same time, the hydrogen gas generated during the electrolysis treatment degreases the steel surface. The film formed on the surface of stainless steel has high wettability of the paint and the adhesive, and the paintability and adhesiveness are dramatically improved. Therefore, when a coating film is formed on this surface-treated steel sheet, it has extremely excellent properties when used as a gasket or the like.
【００１０】[0010]
【実施例】次に本発明の実施例について説明する。ただ
し本発明はその要旨を越えない限り以下の実施例に制約
されるものではない。 ［実施例１］ 本発明陰極処理と陽極処理とのぬれ性、
塗装性の比較EXAMPLES Next, examples of the present invention will be described. However, the present invention is not limited to the following examples unless it exceeds the gist. [Example 1] The wettability between the cathode treatment and the anode treatment of the present invention,
Comparison of paintability
【００１１】オーステナイト系ステンレス鋼ＳＵＳ３０
４ステンレス鋼のＢＡ仕上げ材（板厚０．４mm）及び１
９重量％クロム含有のフェライト系ステンレス鋼（板厚
０．４mm）について、水酸化ナトリウム２０ｇ／ｌ、リ
ン酸三ナトリウム１２水塩３０ｇ／ｌ、炭酸ナトリウム
４０ｇ／ｌの水溶液８０℃中で陽極電解電流密度６Ａ／
ｄｍ2 で１２０秒処理した後水洗、乾燥させた。また、
両鋼種を本発明である同溶液８０℃中で陰極電解電流密
度６Ａ／ｄｍ2 で１２０秒処理した後水洗、乾燥させ
た。このあと市販のシリコンアクリル系塗料を５〜６μ
ｍの厚さで塗布し、試験材に供した。また、両ステンレ
ス鋼を電解処理せずに塗装系は同様のものを用いたもの
を比較材とした。ぬれ性の評価は塗装前にグリセリン
（一級試薬）との接触角を測定した。塗装性の評価はエ
リクセン６mm張り出し加工、２ｔ曲げ加工後ＣＡＳＳ試
験２４０時間に供し、その二次密着性をＣＡＳＳ試験
後、加工面にセロテープを貼り付け、急速に剥した後、
全く剥離の無いものを○印、僅かに剥離したものを△
印、著しく剥離したものを×印として目視で判定を行な
った。Austenitic stainless steel SUS30
4 stainless steel BA finishing material (sheet thickness 0.4mm) and 1
Anodic electrolysis of ferritic stainless steel containing 9 wt% chromium (plate thickness 0.4 mm) in an aqueous solution of sodium hydroxide 20 g / l, trisodium phosphate dodecahydrate 30 g / l, sodium carbonate 40 g / l at 80 ° C. Current density 6A /
dm 2 After treatment for 120 seconds, it was washed with water and dried. Also,
Both steel types were subjected to cathodic electrolysis current density of 6 A / dm 2 in the same solution of the present invention at 80 ° C. After treatment for 120 seconds, it was washed with water and dried. After this, use commercially available silicone acrylic paint 5-6μ
It was applied in a thickness of m and used as a test material. A comparative material was prepared by using the same coating system without electrolytically treating both stainless steels. The wettability was evaluated by measuring the contact angle with glycerin (primary reagent) before coating. The coating property was evaluated by Erichsen 6 mm overhanging, 2t bending, and then subjected to the CASS test for 240 hours. After the CASS test for the secondary adhesion, a cellophane tape was attached to the processed surface and rapidly peeled off.
○: No peeling at all, △: slightly peeled off
Marks and those markedly peeled off were marked with x and judged visually.
【００１２】評価結果を表１に示す。陽極電解処理品で
はフェライト系ステンレス鋼に顕著なぬれ性の向上と塗
装性の向上が認められたが、オーステナイト系ステンレ
ス鋼ＳＵＳ３０４では、若干のぬれ性の向上が認められ
るものの、塗装性の向上は特に認められなかった。一
方、陰極電解処理を施したものでは両鋼種共に顕著なぬ
れ性の向上と塗装性の向上が認められた。 ［実施例２］ 本発明処理鋼と本発明処理をおこなわな
い鋼との二次加工性の評価The evaluation results are shown in Table 1. In the anodically-electrolyzed product, the ferritic stainless steel showed remarkable improvement in wettability and coatability, whereas the austenitic stainless steel SUS304 showed a slight improvement in wettability, but improved coatability. Not particularly recognized. On the other hand, in the case of those subjected to cathodic electrolysis treatment, remarkable improvements in wettability and paintability were observed for both steel types. [Example 2] Evaluation of secondary workability between the steel treated according to the present invention and the steel not treated according to the present invention
【００１３】板厚０．４ｍｍのＳＵＳ３０４ステンレス
鋼のＢＡ仕上げ材を水酸化ナトリウム２０ｇ／ｌ、リン
酸三ナトリウム１２水塩３０ｇ／ｌ、炭酸ナトリウム４
０ｇ／ｌの水溶液８０℃中で陰極電解電流密度６Ａ／ｄ
ｍ2 で６０秒処理した後水洗、乾燥させた。このあと市
販のシリコンアクリル系塗料を５〜６μｍの厚さで塗布
し、試験材に供した。また、本発明の陰極展開処理をし
ないで塗装系は同様のものを用いて比較例として両者の
塗膜密着性を曲げ加工、エリクセン６ｍｍ張り出し加
工、クロスカット後ＣＡＳＳ試験２４０時間に供し、そ
の二次密着性を評価し結果を表２に示した。 ［実施例３］ 本発明処理鋼と本発明処理をおこなわな
い鋼との二次加工性の評価A BA finishing material of SUS304 stainless steel having a plate thickness of 0.4 mm was prepared by using 20 g / l of sodium hydroxide, 30 g / l of trisodium phosphate dodecahydrate and 4 of sodium carbonate.
Cathode electrolysis current density 6 A / d in 0 g / l aqueous solution 80 ° C
m 2 After being treated for 60 seconds, it was washed with water and dried. Then, a commercially available silicon acrylic paint was applied to a thickness of 5 to 6 μm and used as a test material. Further, as a comparative example, the same coating system was used without the cathodic expansion treatment of the present invention, and the coating adhesion between the two was bent, Erichsen 6 mm overhanging, and subjected to the CASS test for 240 hours after cross cutting. The next adhesion was evaluated and the results are shown in Table 2. [Example 3] Evaluation of secondary workability between the steel treated according to the present invention and the steel not treated according to the present invention
【００１４】板厚０．２ｍｍのＳＵＳ３０１ステンレス
鋼の１号仕上げ材を水酸化ナトリウム４０ｇ／ｌ、リン
酸三ナトリウム１２水塩３０ｇ／ｌ、炭酸ナトリウム４
０ｇ／ｌの水溶液７５℃中で陰極電解電流密度６Ａ／ｄ
ｍ2 で６０秒処理した後水洗、乾燥させた。このあと市
販のシリコンアクリル系塗料を５〜６μｍの厚さで塗布
し、試験材に供した。また、本発明の陰極電解処理をし
ないで塗装系は同様のものを用いて比較例として両者の
塗膜密着性をＶ曲げ加工を施した後ＣＡＳＳ試験２４０
時間に供し、その二次密着性を評価し結果を表３に示し
た。 ［実施例４］ 本発明処理鋼と本発明処理をおこなわな
い鋼との塗膜密着性の評価A No. 1 finishing material of SUS301 stainless steel having a plate thickness of 0.2 mm was prepared by adding 40 g / l of sodium hydroxide, 30 g / l of trisodium phosphate dodecahydrate and 4 of sodium carbonate.
Cathode electrolysis current density 6A / d in 0g / l aqueous solution 75 ° C
m 2 After being treated for 60 seconds, it was washed with water and dried. Then, a commercially available silicon acrylic paint was applied to a thickness of 5 to 6 μm and used as a test material. In addition, the same coating system was used without the cathodic electrolysis treatment of the present invention, and as a comparative example, the coating adhesion between the two was subjected to V-bending and then the CASS test 240.
It was subjected to time, and its secondary adhesion was evaluated, and the results are shown in Table 3. [Example 4] Evaluation of coating film adhesion between the steel treated according to the present invention and the steel not treated according to the present invention
【００１５】板厚０．２mmのＳＵＳ３０１ステンレス鋼
の１号仕上げ材を水酸化ナトリウム２０ｇ／ｌ、リン酸
三ナトリウム１２水塩３０ｇ／ｌ、炭酸ナトリウム４０
ｇ／ｌの水溶液８５℃中で陰極電解電流密度６Ａ／ｄｍ
2 で６０秒、１８０秒、３００秒処理した後水洗、乾燥
させた。このあとシリコンアクリル系塗料を５〜６μｍ
の厚さで塗布し、試験材に供した。また、本発明の陰極
電解処理をしないで塗装系は同様のものを用いて比較例
として両者の塗膜密着性をホンダ純正ラジエター液原液
１３０℃中に１００時間半浸漬し、塗膜の密着性を評価
した結果を表４に示した。 ［実施例５］ 本発明処理鋼と本発明処理をおこなわな
い鋼との塗膜密着性の評価A No. 1 finishing material of SUS301 stainless steel with a plate thickness of 0.2 mm was prepared by adding 20 g / l of sodium hydroxide, 30 g / l of trisodium phosphate dodecahydrate and 40 of sodium carbonate.
Cathode electrolysis current density 6 A / dm in 85 ° C. g / l aqueous solution
2 After being treated for 60 seconds, 180 seconds, and 300 seconds, it was washed with water and dried. After this, add 5-6 μm of silicon acrylic paint
Was applied to provide a test material. As a comparative example, the same coating system was used without the cathodic electrolysis treatment of the present invention. As a comparative example, the coating adhesion between the two was soaked in a Honda genuine radiator liquid stock solution at 130 ° C. for 100 hours and a half. The results of the evaluation are shown in Table 4. [Example 5] Evaluation of coating film adhesion between the steel treated according to the present invention and the steel not treated according to the present invention
【００１６】板厚０．２ｍｍのＳＵＳ３０１ステンレス
鋼の１号仕上げ材を水酸化ナトリウム２０ｇ／ｌ、リン
酸三ナトリウム１２水塩３０ｇ／ｌ、炭酸ナトリウム４
０ｇ／ｌの水溶液８５℃中で陰極電解電流密度６Ａ／ｄ
ｍ2 で５分間処理した後水洗、乾燥させた。序でイブに
シリコンアクリル系塗料を５〜６μｍの厚さで塗布し
た。この後市販のフェノール系接着材を用いて２０μｍ
のアクリロニトリルブタジエンゴム（以下ＮＢＲと略
す）を張りつけた。また、本発明の陰極電解処理をしな
いで同様にＮＢＲを張りつけたものを比較例として両者
の密着性をホンダ純正ラジエター液（商品名）原液１３
０℃中に１００時間半浸漬および０．２ＲのＶ曲げ加工
後にテープ剥離試験で評価した結果を表５に示した。A No. 1 finishing material of SUS301 stainless steel having a plate thickness of 0.2 mm was prepared by adding 20 g / l of sodium hydroxide, 30 g / l of trisodium phosphate dodecahydrate and 4 of sodium carbonate.
Cathode electrolysis current density 6 A / d in 0 g / l aqueous solution 85 ° C
m 2 It was treated with water for 5 minutes, washed with water and dried. In the beginning, a silicone acrylic paint was applied to Eve in a thickness of 5 to 6 μm. After this, using a commercially available phenol adhesive, 20 μm
Acrylonitrile butadiene rubber (hereinafter abbreviated as NBR) was attached. In addition, as a comparative example, the one in which NBR was similarly adhered without the cathodic electrolysis treatment of the present invention was used as a comparative example to show the adhesion between the two.
Table 5 shows the results of evaluation by a tape peeling test after immersion in 0 ° C. for 100 hours and a half and V bending of 0.2R.
【００１７】実施例２、３における密着性の評価方法は
ＣＡＳＳ試験後におこない、実施例５では加工後に加工
面にセロテープを貼り付け、急速に剥した後におこなっ
た。そして、全く剥離の無いものを○印、僅かに剥離し
たものを△印、著しく剥離したものを×印として目視で
判定を行なった。実施例４、５のラジエター液原液に半
浸漬試験では剥離の全く無いものを○印、ブリスターが
認められるものを△印、著しく剥離したものを×印とし
て目視で判定を行なった。The adhesion evaluation method in Examples 2 and 3 was carried out after the CASS test, and in Example 5 after the processing, a cellophane tape was attached to the processed surface and rapidly peeled off. Then, it was visually judged that there was no peeling at all, ○ was slightly peeled, Δ was markedly peeled, and X was markedly peeled. In the semi-immersion test of the radiator liquid stock solutions of Examples 4 and 5, those with no peeling were marked with ◯, those with blister were marked with Δ, and those with significant peeling were marked with X, and visually judged.
【００１８】表から判るように本発明の陰極電解処理を
施したものは優れた密着性、接着性能を有している。特
に実施例２においては加工度の高い０〜４ｔ曲げでは僅
かに剥離した△〜○に対し、比較例の塗膜は著しく剥離
していた。また、実施例５においても接着性が優れてい
ることが判った。 ［実施例６］ 本発明処理とクロメート処理との塗装密
着性比較As can be seen from the table, the products subjected to the cathodic electrolysis treatment of the present invention have excellent adhesion and adhesion performance. In particular, in Example 2, the coating film of Comparative Example was remarkably peeled, while the peeling was slightly peeled in the case of 0 to 4 t bending, which had a high working degree. It was also found that the adhesive property was excellent in Example 5. [Example 6] Comparison of coating adhesion between the present invention treatment and the chromate treatment
【００１９】ステンレス鋼を基材とする塗装鋼板では、
塗装前処理として一般にクロメート処理がおこなわれて
いる。そこで、本発明とクロメート処理との塗装密着性
を比較した。In the coated steel sheet based on stainless steel,
Chromate treatment is generally performed as a pretreatment for coating. Therefore, the coating adhesion between the present invention and the chromate treatment was compared.
【００２０】板厚０．４ｍｍのＳＵＳ３０４ステンレス
鋼のＢＡ仕上げ材を水酸化ナトリウム２０ｇ／ｌ、リン
酸三ナトリウム１２水塩３０ｇ／ｌ、炭酸ナトリウム４
０ｇ／ｌの水溶液８０℃中で陰極電界電流密度６Ａ／ｄ
ｍ2 で１２０秒処理した後、水洗、乾燥させた。この後
市販のシリコンアクリル系塗料を５〜６μｍの厚さで塗
布し、試験材に供した。また比較例として同鋼種にクロ
メート処理を０．０５〜０．１μｍの厚さに施した後、
市販のシリコンアクリル系塗料を５〜６μｍの厚さで塗
布した。両者の塗膜密着性を曲げ加工、エリクセン６ｍ
ｍ張出し加工後ＣＡＳＳ試験２４０時間に供し、その二
次密着性を評価し、結果を表６に示した。密着性の評価
方法はＣＡＳＳ試験後に加工面にセロテープを張付け、
急速に剥がした後、全く剥離のないものを○印、僅かに
剥離したものを△印、著しく剥離したものを×印として
目視にて判定をおこなった。表６から分かるように本発
明の陰極電界処理を施したものはクロメート処理と同等
以上の塗装密着性を有していることが分かる。BA finishing material of SUS304 stainless steel having a plate thickness of 0.4 mm was prepared by adding 20 g / l of sodium hydroxide, 30 g / l of trisodium phosphate dodecahydrate and 4 of sodium carbonate.
Cathode electric field current density 6 A / d in 0 g / l aqueous solution 80 ° C
m 2 After being treated for 120 seconds, it was washed with water and dried. Thereafter, a commercially available silicone acrylic paint was applied to a thickness of 5 to 6 μm and used as a test material. Further, as a comparative example, after subjecting the same steel type to chromate treatment to a thickness of 0.05 to 0.1 μm,
A commercially available silicone acrylic paint was applied to a thickness of 5 to 6 μm. Bending the coating adhesion of both, Erichsen 6m
After the m-overhanging process, the sample was subjected to a CASS test for 240 hours, its secondary adhesion was evaluated, and the results are shown in Table 6. The evaluation method of adhesion is to stick cellophane tape on the processed surface after the CASS test,
After being rapidly peeled off, those with no peeling were marked with a circle, those with a slight peeling were marked with a Δ, and those with a significant peeling were marked with a X, and visual judgment was made. As can be seen from Table 6, those subjected to the cathode electric field treatment of the present invention have coating adhesion that is equal to or higher than that of chromate treatment.
【００２１】[0021]
【発明の効果】以上の結果から明らかなように、本発明
方法に係るステンレス鋼によれば、密着性、接着性に優
れており、塗装ステンレス鋼が使用される用途、例えば
内装建材、車両用モールディング部品、家電・ＯＡ機器
等に利用できる。また、ガスケット部品等ではステンレ
ス鋼にＮＢＲ等のエラストマーを接合させているが、そ
の下地処理にも利用できる。As is clear from the above results, the stainless steel according to the method of the present invention has excellent adhesion and adhesiveness, and is used for applications in which coated stainless steel is used, such as interior building materials and vehicles. It can be used for molding parts, home appliances and office automation equipment. Further, in gasket parts and the like, an elastomer such as NBR is joined to stainless steel, but it can also be used for the surface treatment.
【００２２】[0022]
【表１】 [Table 1]
【００２３】[0023]
【表２】 [Table 2]
【００２４】[0024]
【表３】 [Table 3]
【００２５】[0025]
【表４】 [Table 4]
【００２６】[0026]
【表５】 [Table 5]
【００２７】[0027]
【表６】 [Table 6]
Claims (5)
極電解処理して鉄系水和酸化物皮膜を形成する表面処理
方法。1. A surface treatment method of forming an iron-based hydrated oxide film by subjecting the surface of stainless steel to cathodic electrolysis in an alkaline solution.
含有量が３重量％未満の鉄系材料である請求項１に記載
の表面処理方法。2. The surface treatment method according to claim 1, wherein the counter electrode used in the cathodic electrolysis treatment is an iron-based material having a nickel content of less than 3% by weight.
酸化ナトリウムを含む溶液、又は０．２〜５０重量％水
酸化ナトリウムに緩衝剤として０．２〜２０重量％のリ
ン酸三ナトリウム１２水塩、０．２〜２０重量％の炭酸
ナトリウムを加えた緩衝水溶液で、液温が２０℃〜９５
℃、電流密度０．５Ａ／ｄｍ2 以上、処理時間１０秒以
上である請求項１又は２に記載の表面処理方法。3. The electrolytic treatment solution is 0.2 to 50% by weight of water.
Solution containing sodium oxide or 0.2 to 50 wt% water
0.2 to 20% by weight of sodium oxide as a buffering agent
Trisodium acid dodecahydrate, 0.2-20% by weight carbonic acid
A buffered aqueous solution containing sodium at a liquid temperature of 20 ° C to 95
℃, current density 0.5A / dm2 More than 10 seconds processing time
The surface treatment method according to claim 1 or 2, which is the above.
主体とする皮膜を形成した表面処理ステンレス鋼。4. A surface-treated stainless steel having a coating mainly composed of iron-based hydrated oxide formed on the surface of stainless steel.
主体とする皮膜を形成し、この皮膜上に塗膜を形成して
なるガスケット。5. A gasket formed by forming a film mainly composed of iron-based hydrated oxide on the surface of stainless steel, and forming a film on the film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22327391A JP2966595B2 (en) | 1991-09-04 | 1991-09-04 | Stainless steel surface treatment method, surface treated stainless steel, and gasket |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22327391A JP2966595B2 (en) | 1991-09-04 | 1991-09-04 | Stainless steel surface treatment method, surface treated stainless steel, and gasket |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0565697A true JPH0565697A (en) | 1993-03-19 |
| JP2966595B2 JP2966595B2 (en) | 1999-10-25 |
Family
ID=16795542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22327391A Expired - Fee Related JP2966595B2 (en) | 1991-09-04 | 1991-09-04 | Stainless steel surface treatment method, surface treated stainless steel, and gasket |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2966595B2 (en) |
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| JP2003053143A (en) * | 2001-08-10 | 2003-02-25 | Bitsugu Sons:Kk | Photocatalytic member, base material to be used in the member and method for manufacturing the member |
| WO2005066393A1 (en) * | 2003-12-26 | 2005-07-21 | Toyo Kohan Co., Ltd. | Method and apparatus for forming oxide coating |
| US8551317B2 (en) | 2003-12-26 | 2013-10-08 | Toyo Seikan Kaisha, Ltd. | Method and apparatus for forming oxide coating |
| JP2007280664A (en) * | 2006-04-04 | 2007-10-25 | Toyota Motor Corp | Surface treatment method, separator for fuel cell, and manufacturing method of separator for fuel cell |
| WO2008136306A1 (en) * | 2007-04-27 | 2008-11-13 | Nippon Kinzoku Co., Ltd. | Electroconductive member of stainless steel and process for producing the electroconductive member |
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|---|---|
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