Pretreatment for aluminum and aluminum alloys
US6521029B1 · kind B1 · utility
19Cited by
13References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 5, 2002 |
| Grant date | Feb 18, 2003 |
| Priority date | — |
| Expiry date | Apr 5, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C2222/10
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Pretreated aluminum and aluminum alloys and the process for pretreating said aluminum substrates to improve its corrosion-resistance, and adhesion properties which comprises pretreating said aluminums with an effective amount of an acidic aqueous solution having a pH ranging from about 2.5 to 4.5 and comprises effective amounts of a trivalent chromium compound, alkali metal hexafluorozirconates, at least one alkali metal fluoro-compound, and small but effective amounts of water soluble thickeners and/or surfactants.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.