Ferrate conversion coatings for metal substrates
US6471788B1 · kind B1 · utility
10Cited by
17References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1999 |
| Grant date | Oct 29, 2002 |
| Priority date | — |
| Expiry date | Dec 15, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/66
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method employing oxide film conversion coatings prepared using ferrate (VI) as the oxidizing agent is disclosed. Metal substrates or surfaces, such as aluminum, aluminum alloys or other metals, are contacted with an aqueous solution comprising ferrate (VI) anions to form a corrosion resistant conversion coating on the surface thereof. The ferrate anion concentration is preferably between about 0.0166% and about 1.66% by weight. The coating process is carried out by dipping, spraying, or painting at temperatures ranging from 25° C. to 100° C. for a period of time ranging from about 1 second to about 5 minutes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.