Method for surface treating aluminum products
US6440290B1 · kind B1 · utility
13Cited by
13References
42Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 4, 2000 |
| Grant date | Aug 27, 2002 |
| Priority date | — |
| Expiry date | Dec 20, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D11/24
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
There is disclosed a method for surface treating aluminum products, especially vehicle wheels, to improve their brightness. The method comprises: (a) applying a chemical brightening composition to these products; (b) deoxidizing the surface of these wheel products in a nitric acid-based bath; (c) forming a porous oxide on that with an electrolytic bath containing phosphoric acid; and (d) applying, preferably spraying, a siloxane-based film to that porous oxide. In many instances, intermediate rinsing substeps are performed between these respective main steps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.