Process for producing manganese-containing zinc phosphate coatings on galvanized steel
US5372656A · kind A · utility
2Cited by
1References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 16, 1993 |
| Grant date | Dec 13, 1994 |
| Priority date | — |
| Expiry date | Sep 16, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/365
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
In a process for phosphatizing electrolytically and/or hot-dip galvanized steel strip, the steel strip is briefly treated with acidic phosphatizing solutions which contain, in addition to zinc and phosphate ions, manganese and nickel cations and anions of oxygen-containing acids with an accelerator effect. The weight ratio of nickel cations to nitrate anions is adjusted to between 1:10 and 1:60 and the weight ratio of manganese cations nitrate anions is adjusted to between 1:1 and 1:40.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.