Process for treating metal surfaces
US9234283B2 · kind B2 · utility
1Cited by
32References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 12, 2008 |
| Grant date | Jan 12, 2016 |
| Priority date | — |
| Expiry date | Sep 6, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/73
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The corrosion resistance of a metal substrate surface treated with an acidic aqueous composition to form a conversion coating is improved by first contacting the surface with an oxidizing acidic pre-rinse, such as an aqueous solution of nitric acid and hydrogen peroxide, or nitric acid and hydrofluoric acid, or Fe+3 cations and hydrofluoric acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.