Process for electrolytically coloring aluminum and aluminum alloys
US4070255A · kind A · utility
7Cited by
4References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 3, 1976 |
| Grant date | Jan 24, 1978 |
| Priority date | — |
| Expiry date | Mar 3, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D11/22
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Aluminum or aluminum alloy is first anodized to form an oxide film thereon. With the pores in this oxide film unsealed, the basis metal is then electrolyzed by use of alternating current at a preselected starting voltage, and this voltage is lowered at least once before completion of the electrolytic coloring of the basis metal. The electrolytic solution in which the electrolysis is effected contains either at least three metallic salts or at least two metallic salts and a strong reducing compound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.