Visible chromium- and phosphorus-free conversion coating for aluminum and its alloys
US6464800B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 2001 |
| Grant date | Oct 15, 2002 |
| Priority date | — |
| Expiry date | Apr 30, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/34
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A visible colored chromium- and phosphorus-free conversion coating can be formed on a metal surface by contacting it with an aqueous liquid composition that comprises an alizarine dye and a product of chemical interaction between a first initial reagent component selected from the group consisting of fluoroacids of the elements titanium, zirconium, hafnium, boron, aluminum, silicon, germanium, and tin; and a second initial reagent component selected from the group consisting of titanium, zirconium, hafnium, boron, aluminum, silicon, germanium, and tin and all of oxides, hydroxides, and carbonates of all of titanium, zirconium, hafnium, boron, aluminum, silicon, germanium, and tin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.