Conversion coating solution for treating metallic surfaces
US4220486A · kind A · utility
6Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1979 |
| Grant date | Sep 2, 1980 |
| Priority date | — |
| Expiry date | Jul 6, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/36
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A conversion coating solution for treating metallic surfaces is able to form conversion coating films having excellent anticorrosiveness and giving good adhesiveness and gloss to the overcoating. The conversion coating solution has a pH value of 5.5 to 6.5 and contains 0.1 to 50 g/liter as phosphate ion of acid salts of alkali phosphates, 0.01 to 0.5 g/liter of stannous ion and 2 to 12-fold by weight as much fluorine ion as the stannous ion. The conversion coating solution may be further combined with 0.2 to 5 g/liter of at least one of pyrazole compounds, hydroxylamine compounds and hydrazine compounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.