Non-chromate conversion coatings

Details Non-chromate conversion coatings Non-chromate conversion coatings

C - Chemistry, Metallurgy

23

G

148/19

C23G 1/02 (2006.01) C23C 22/48 (2006.01) C23C 22/53 (2006.01)

Patent

CA 1134726

NON-CHROMATE CONVERSION COATINGS ABSTRACT Improved brightness and corrosion resistance are impart- ed to metal surfaces such as zinc plated surfaces, by treatment with a non-toxic solution comprised of sulfuric acid, hydrogen peroxide, a silicate, certain primary organophosphorus compound promoters and at least one secondary promoter selected from ascorbic acid, boric acid, gluconic acid, glycolic acid, tartaric acid and salts of said acids.

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