Metal surface treatment
US4059452A · kind A · utility
2Cited by
8References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 28, 1975 |
| Grant date | Nov 22, 1977 |
| Priority date | — |
| Expiry date | Jan 28, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/26
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Disclosed is a method of coating a metal surface by contacting it with an aqueous acidic solution containing hexavalent chromium and either a non-ionic surfactant having the formula EQU RO(CH.sub.2 CH.sub.2 O).sub.n H wherein PA1 R = a saturated or unsaturated aliphatic radical of 5 to 25 carbon atoms PA1 n = 2 to 30 Or glycine followed by drying and baking the surface. Preferably, the solution also contains urea.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.