B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 15/18 (2006.01) C04B 28/26 (2006.01) C09D 5/08 (2006.01) C23C 28/00 (2006.01)
Patent
CA 2055153
Steel sheet coated with a nontoxic, relatively insoluble, inorganic, corrosion resistant coating. A silicate coating is formed on a steel sheet by rinsing the sheet for at least 30 seconds in an alkaline aqueous solution containing 0.005 M silicate, 0.005 M metal salt and having a temperature of at least 25ÀC. The sheet is dried to form an adherent silicate coating having a thickness of at least 2 nm prior to being treated with an aqueous solution containing 0.5-5 vol.-% silane. If the sheet is painted, the silane film forms an adherent bond between the paint and the silicate coating. A silane treated silicate coating minimizes red rusting on terne coated steel by sealing pin holes. A silane treated silicate coating also provides good corrosion protection and paint adherence on cold-rolled or galvanized steel. 20
Ooij Wim J. Van
Sabata Ashok
Armco Steel Company L.p.
Riches Mckenzie & Herbert Llp
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