JPS5616696A - Preparation of electrolytic chromic acid treated steel sheet having high adhesive strength - Google Patents
Preparation of electrolytic chromic acid treated steel sheet having high adhesive strengthInfo
- Publication number
- JPS5616696A JPS5616696A JP8980379A JP8980379A JPS5616696A JP S5616696 A JPS5616696 A JP S5616696A JP 8980379 A JP8980379 A JP 8980379A JP 8980379 A JP8980379 A JP 8980379A JP S5616696 A JPS5616696 A JP S5616696A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- aqueous solution
- treatment
- chromate
- cathode
- 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 inexpensively obtain the electrolytic chromic acid treated steel sheet having a superior adhesive property, by electrolytically treating the steel sheet in aqueous solution of chromic anhydride etc. making the steel sheet as cathode and next, electrolytically treating it again after carrying out nonelectrolytic dippling treatment in the same aqueous solution at a fixed time and then, washing by water and drying.
CONSTITUTION: ≥0.5sec nonelectrolytic treatment is carried out in the following component aqueous solution and the upper chromate layer having a high hydration degree, is eluted and exfoliated after electrolytically treating the steel sheet in aqueous solution of chromic anhydride, chromate, etc. making the steel sheet as cathode, at the time of manufacturing the above-mentioned steel sheet having the coating composed of metallic Cr inner layer and chromate outer layer. Next, chromate layer having a low hydration degree is forme by electrollytically treating the steel sheet with a suitable current density in the same bath again and 0.5W15sec treatment is carried out by 65W100°C, ≥4pH high temperature water and then, the above-mentioned steel sheet having a low deteriorating property on standing, is inexpensively obtaned. 2.5coulomb/dm2 cathode electrolytic treatment is allowed to carry out in aqueous solution of alkali metal etc. controlled >1.5pH, <0.5g/l sulfuric acid ion in the state of wetting the surface by flushing after carrying out the above-mentioned second electrolytic treatment.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8980379A JPS5616696A (en) | 1979-07-17 | 1979-07-17 | Preparation of electrolytic chromic acid treated steel sheet having high adhesive strength |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8980379A JPS5616696A (en) | 1979-07-17 | 1979-07-17 | Preparation of electrolytic chromic acid treated steel sheet having high adhesive strength |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5616696A true JPS5616696A (en) | 1981-02-17 |
Family
ID=13980867
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8980379A Pending JPS5616696A (en) | 1979-07-17 | 1979-07-17 | Preparation of electrolytic chromic acid treated steel sheet having high adhesive strength |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5616696A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01219194A (en) * | 1988-02-27 | 1989-09-01 | Nkk Corp | Pretreatment of electrolytically chromated steel sheet |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5157646A (en) * | 1974-11-18 | 1976-05-20 | Nippon Kokan Kk | MITSUCHAKURYOKUNOTAKAISUIWAKUROMUSANKABUTSUSOOMOTSU TADENKAIKUROMEETOSHORIKOHANNOSEIZOHO |
-
1979
- 1979-07-17 JP JP8980379A patent/JPS5616696A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5157646A (en) * | 1974-11-18 | 1976-05-20 | Nippon Kokan Kk | MITSUCHAKURYOKUNOTAKAISUIWAKUROMUSANKABUTSUSOOMOTSU TADENKAIKUROMEETOSHORIKOHANNOSEIZOHO |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01219194A (en) * | 1988-02-27 | 1989-09-01 | Nkk Corp | Pretreatment of electrolytically chromated steel sheet |
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