Metal sheet with enhanced corrosion resistance having a silane treated aluminate coating
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United States of America Patent
Stats
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Jun 21, 1994
Grant Date -
N/A
app pub date -
Mar 24, 1993
filing date -
Mar 24, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Patent Citation Ranking
- 36 Citation Count
- B05D Class
- 92.56 % this patent is cited more than
- 31 Age