JPS5616697A - Preparation of chromic acid treaded steel sheet having low deterioration on standing of adhesive strength - Google Patents
Preparation of chromic acid treaded steel sheet having low deterioration on standing of adhesive strengthInfo
- Publication number
- JPS5616697A JPS5616697A JP9096379A JP9096379A JPS5616697A JP S5616697 A JPS5616697 A JP S5616697A JP 9096379 A JP9096379 A JP 9096379A JP 9096379 A JP9096379 A JP 9096379A JP S5616697 A JPS5616697 A JP S5616697A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- adhesive strength
- standing
- treating
- chromic acid
- 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
Landscapes
- Electrochemical Coating By Surface Reaction (AREA)
Abstract
PURPOSE: To obtain the above-mentioned steel sheet having no deterioration on standing of adhesive strength, by electrolytically treating in Cr acid bath having a specified ratio of SO4 --/Cr+6 at a specified electric current density and moreover, treating by a high temperature water at a specified condition after forming a fixed quantity of chromate coating on the surface of the steel sheet.
CONSTITUTION: 5W50mg/m2 chromate coating is formed on the surface of steel sheet by electrolytic Cr acid treatmtnet in the aqueous solution of chromic anhydride, etc. making the steel sheet as cathode and cathodic electrolytic treatment is carried out in chromic acid of ≥1/75, ≤1/4 SO4 --/Cr+6 ratio at ≥50°C temperature and ≤5A/dm2 electric current density as it is or after washing by water. Moreover, elution of Cr+6 and anion, such as SO4 --, etc., eluted from the chromate coating in a short time, is carried out by treating by a high temperature water of 65W100°C temperature and ≥4pH for 0.3W10sec. Thus, the above-mentioned treated steel sheet useful for adhesion can etc. and having a superior adhesive strength not deteriorated by the secular change, is obtaned.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9096379A JPS5616697A (en) | 1979-07-19 | 1979-07-19 | Preparation of chromic acid treaded steel sheet having low deterioration on standing of adhesive strength |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9096379A JPS5616697A (en) | 1979-07-19 | 1979-07-19 | Preparation of chromic acid treaded steel sheet having low deterioration on standing of adhesive strength |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5616697A true JPS5616697A (en) | 1981-02-17 |
Family
ID=14013143
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9096379A Pending JPS5616697A (en) | 1979-07-19 | 1979-07-19 | Preparation of chromic acid treaded steel sheet having low deterioration on standing of adhesive strength |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5616697A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01219194A (en) * | 1988-02-27 | 1989-09-01 | Nkk Corp | Pretreatment of electrolytically chromated steel sheet |
JPH04308093A (en) * | 1991-04-03 | 1992-10-30 | Nkk Corp | Silicon steel sheet having electrolytic-treated insulating film and its production |
-
1979
- 1979-07-19 JP JP9096379A patent/JPS5616697A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01219194A (en) * | 1988-02-27 | 1989-09-01 | Nkk Corp | Pretreatment of electrolytically chromated steel sheet |
JPH04308093A (en) * | 1991-04-03 | 1992-10-30 | Nkk Corp | Silicon steel sheet having electrolytic-treated insulating film and its production |
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