Chromate coating of zinc surfaces
US4749418A · kind A · utility
14Cited by
3References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1986 |
| Grant date | Jun 7, 1988 |
| Priority date | — |
| Expiry date | Aug 8, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/38
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A chromate composition and process provide improved corrosion resistance and paint adhesion for zinc surfaces. The aqueous acidic composition contains hexavalent and trivalent chromium phosphate and fluorozirconate at prescribed concentrations. The composition is applied and dried without rinsing to yield a chromium coating weight of 10-200 mg/m.sup.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.