Tri-cation zinc phosphate conversion coating and process of making the same
US6551417B1 · kind B1 · utility
5Cited by
18References
41Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2000 |
| Grant date | Apr 22, 2003 |
| Priority date | — |
| Expiry date | Sep 20, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/184
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Tri-cation zinc phosphate conversion coating compositions are disclosed. The compositions include a phosphate component, ions of nickel, manganese, and zinc, and a glycerophosphate component, such as disodium glycerophosphate. Coatings formed from these compositions provide improved corrosion resistance to metal substrates and provide a uniform layer for the application of paint finishes. Processes of making and using these compositions are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.