Metal pretreated with an aqueous solution containing a dissolved inorganic silicate or aluminate, an organofuctional silane and a non-functional silane for enhanced corrosion resistance
US5433976A · kind A · utility
45Cited by
7References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1994 |
| Grant date | Jul 18, 1995 |
| Priority date | — |
| Expiry date | Mar 7, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C2222/20
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Painted metal sheet pretreated with an insoluble, composite layer containing siloxane. The composite layer is formed by rinsing the sheet with an alkaline solution containing at least 0.005M of a dissolved silicate or a dissolved aluminate, at least 0.1 vol.-% of an organofunctional silane and at least 0.02 vol.-% of a crosslinking-agent having two or more trialkoxysilyl groups. After the sheet is dried, the composite layer has a thickness of at least 10 .ANG.. After being painted, the siloxane forms a tenacious covalent bond between the paint and the metal substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.