Surface treatment for zinciferous surfaces

Details Surface treatment for zinciferous surfaces Surface treatment for zinciferous surfaces

C - Chemistry, Metallurgy

23

C

148/18

C23C 22/33 (2006.01) C23C 22/38 (2006.01)

Patent

CA 2014010

Abstract of the Disclosure Zinciferous surfaces, particularly those of galvanized steel, may be effectively protected against corrosion, either as treated or after painting, while remaining easy to weld, by contact with an aqueous solution containing chromium in both +6 and +3 valence states, phosphate, a tertiary alcohol or similar oxidation stable, water soluble organic compound as a wetting agent, and a silane coupling agent, followed by drying with a film from the solution still in place on the surface. A thin coating containing 10 - 200 mg/m2 of chromium is formed on the surface to provide a protective layer that is also an excellent base for paint. 4::C:\M4795NI.APP

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