Metal sheet with enhanced corrosion resistance having a silane treated aluminate coating
US5322713A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1993 |
| Grant date | Jun 21, 1994 |
| Priority date | — |
| Expiry date | Mar 24, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C2222/20
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Metal sheet protected against corrosion by a silane treated inorganic aluminate coating. A thin aluminate coating was formed by immersing a galvanized steel sheet into an alkaline solution containing 0.005M dissolved aluminate for about 30 seconds. The sheet was dried to form an adherent aluminate coating having a thickness of at least 50 .ANG.. The aluminate coated sheet was immersed into a solution containing 1.0 vol.-% hydrolyzed organofunctional silane for about 5 seconds forming a silane film having a thickness of at least 20 .ANG. on the outer surface of the aluminate coating. Thereafter, the silane treated aluminate coated sheet was painted. The silane film formed a covalent bond between the outer paint layer and the inner aluminate layer. A steel sheet treated with the silane sealed aluminate coating had good corrosion protection, good paint chipping resistance and good paint formability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.