Method for forming decorative colored streak patterns on the surface of an aluminum shaped article
US4420378A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1981 |
| Grant date | Dec 13, 1983 |
| Priority date | — |
| Expiry date | Sep 22, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D11/22
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The invention provides a novel and improved method according to which the surface of a shaped article of aluminum or an aluminum-based alloy is provided with decorative streak patterns electrolytically engraved in the surface which can be subsequently colored to increase the decorative effect with uniform distribution over whole surface of the aluminum article. The method comprises first subjecting the anodically oxidized aluminum article to an anodic direct current electrolysis in an electrolytic solution containing a specified electrolyte and then carrying out a cathodic direct current electrolysis with the aluminum article and the counterelectrode kept as before in the same electrolytic solution as used in the first anodic direct current electrolysis with reversed polarity to give uniformly distributed streak patterns on the surface of the aluminum article. The surface of the aluminum article thus provided with the streak patterns is subsequently anodized to enhance the corrosion resistance and then subjected to a coloring treatment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.