Pretreatment for zinc and zinc alloy prior to chromating

Details Pretreatment for zinc and zinc alloy prior to chromating Pretreatment for zinc and zinc alloy prior to chromating

C - Chemistry, Metallurgy

23

C

C23C 22/78 (2006.01) C23C 22/73 (2006.01)

Patent

CA 2092412

Drying into place a covering of an aqueous solution of nickel and/or cobaltous sulfate and/or phosphate sans on a zinc or zinc alloy surface improves at least one of the blackening resistance and corrosion resistance after subsequent chromating treat- ment and the corrosion resistance and paint adherence after subsequent chromating treatment and painting.

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