Protective coating processes for zinc coated steel

Details Protective coating processes for zinc coated steel Protective coating processes for zinc coated steel

C - Chemistry, Metallurgy

23

C

117/95

C23C 22/82 (2006.01) C23C 22/18 (2006.01) C23C 22/36 (2006.01)

Patent

CA 2024793

The cold impact resistance and corrosion resistance of objects having a zinciferous metal surface successively coated with a zinc phosphate conversion coating and an organic surface coating can be improved by utilizing sufficient manganese ion in the solution used for zinc phosphating to assure the presence of at least 3 % by weight manganese in the phosphate conversion coating layer formed. Sufficient phosphating to achieve good bonds to organic surface coatings can be accomplished in as little as 5 seconds.

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