Secondary protective treatments for metal surfaces
US5401337A · kind A · utility
9Cited by
2References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1993 |
| Grant date | Mar 28, 1995 |
| Priority date | — |
| Expiry date | Nov 1, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/83
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Seal coating compositions and methods of applying them to metallic surfaces, particularly aluminum or alloys thereof, beating a previously formed protective coating, particularly a conversion coating, such as a chromate or phosphate coating or a chrome-free metal oxide conversion coating, or a coating formed by anodization, provide improved corrosion resistance beyond that provided by the previously formed protective coating. The seal coating compositions preferably contain at least one of benzotriazole, nickel and/or cobalt cations and borates, or aminated polymers of vinyl styrene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.