Conversion coating solutions for treating metallic surfaces
US4306917A · kind A · utility
7Cited by
4References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1980 |
| Grant date | Dec 22, 1981 |
| Priority date | — |
| Expiry date | Dec 17, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/10
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A conversion coating solution for treating metallic surfaces has a pH value in the range of 3 to 6 and contains 1 g/l to 50 g/l of an acid alkali phosphate as phosphate ions, 0.2 g/l to 20 g/l of one or more of chlorates and bromates, and 0.01 g/l to 0.5 g/l of tin ions, with a weight ratio of chlorine ions to tin ions being between 0.6 and 6. The solution provides a continuous and uniform conversion coating having high anti-corrosion performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.