Composition and method for treating the surface of aluminiferous metals
US5904784A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1996 |
| Grant date | May 18, 1999 |
| Priority date | — |
| Expiry date | Dec 3, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D5/08
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Treatment of aluminiferous metal surfaces with an aqueous liquid composition which has a pH value in the range from 1.8 to 4.0 and comprises (A) from 0.01 to 1.0 g/L of phosphate ions, (B) from 0.01 to 0.5 g/L, measured as its total stoichiometric equivalent as metal, of water-soluble zirconium and titanium compounds, (C) from 0.01 to 2-0 g/L, measured as fluorine, of simple and/or complex fluoride anions; and (D) from 0.01 to 2.0 g/L of water-soluble polyamides that contain at least one tertiary amino or polyoxyalkylene moiety forms a highly corrosion-resistant, strongly paint-adherent, and low friction conversion coating on the metal surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.