Process for electrolytically coloring aluminum and aluminum alloys
US4042468A · kind A · utility
10Cited by
2References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 3, 1976 |
| Grant date | Aug 16, 1977 |
| Priority date | — |
| Expiry date | Mar 3, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D11/14
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Aluminum or aluminum alloy is first anodized to form an oxide film thereon. Before being colored electrolytically in an electrolytic solution, the anodized basis metal is made anodic in this solution, and direct current is passed therethrough. The basis metal is then electrolyzed in the same solution by use of alternating current for actual coloring operation. The electrolytic solution in use contains at least two metallic salts, together with or without a strongly reducing compound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.