Method of producing tin-free steel sheets having improved resistance to retorting treatment
US4432845A · kind A · utility
5Cited by
11References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1983 |
| Grant date | Feb 21, 1984 |
| Priority date | — |
| Expiry date | Jul 14, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S205/917
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Tin-free steel sheets exhibiting improved retorting resistance with respect to paint adhesion are produced by chromium plating a steel sheet through cathodic electrolysis in a chromium ion-containing solution, reversely electrolyzing the sheet by a successive anodizing treatment in said solution, and subjecting the sheet to an electrolytic treatment in an aqueous chromate solution. The SO.sub.4.sup.-- concentration of the chromate solution used in the electrolytic chromate treatment should be limited to the range of 0.01 to 0.10 gram per liter of the solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.