Non-chrome metal treatment composition
US7491274B2 · kind B2 · utility
3Cited by
19References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 29, 2004 |
| Grant date | Feb 17, 2009 |
| Priority date | — |
| Expiry date | Mar 16, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C2222/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Chromate-free treatments and compositions for applying a conversion or passivation coating for metals, more particularly zinc coated metal surfaces. The methods of the invention comprise contacting the requisite metal surface with a phosphonomethylated polyamine. Other aspects of the invention involve methods and compositions in which the following optional components can be included: fluoacid, silane, inorganic phosphorus, acid, latex film forming component and pH adjustment agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.