Chemical post-treatment of selectively galvanized steel strip and sheet
US4708779A · kind A · utility
2Cited by
8References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 20, 1986 |
| Grant date | Nov 24, 1987 |
| Priority date | — |
| Expiry date | Oct 20, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/34
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
This invention is directed to a method of treating a selectively galvanized steel strip, such as one-side electrogalvanized sheet, to improve the appearance and paintability of the non-galvanized areas of said strip. The post chemical processing of the strip, which processing does not chemically attack the zink-coated areas of the strip, comprises the steps of applying to the strip a solution of an aqueous bifluoride salt, followed thereby by rinsing said strip with a dilute caustic solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.