Phosphating process of metal surface
US4292096A · kind A · utility
17Cited by
6References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 13, 1980 |
| Grant date | Sep 29, 1981 |
| Priority date | — |
| Expiry date | Feb 13, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/13
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A process for phosphating a metal surface to be electrocoated, which comprises treating the metal surface with an acidic phosphating solution comprising a zinc compound in a concentration of 0.5 to 1.5 g/l as zinc ion, a phosphate in a concentration of 5 to 30 g/l as phosphate ion and a nitrite in a concentration of 0.01 to 0.2 g/l as nitrite ion and/or an aromatic nitro compound in a concentration of 0.05 to 2 g/l in water at a temperature of 40 to 70.degree. C. first by dipping for not less than 15 seconds and then by spraying for not less than 2 seconds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.