Coloring methods for aluminum and aluminum alloys
US4024039A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1975 |
| Grant date | May 17, 1977 |
| Priority date | — |
| Expiry date | Jan 23, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D13/20
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for coloring aluminum and aluminum alloys comprising passing an alternating current from the article of aluminum or aluminum alloys having an oxidized film thereon through an aqueous solution of one or more salts of one or more metals of Group VIII of the periodic table, and thereafter passing a direct current through an aqueous solution of electrolyte utilizing the aluminum material as the anode wherein said solution may have a conductivity of more than 10 .mu..OMEGA..sup.-.sup.1 cm.sup.-.sup.1, be the same as the one used when employing the alternating current or contain a water-soluble resin. The electrolyte is free of added acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.