Variation in Corrosion Resistance of Trivalent Chromate Coating Depending on Type of Zinc Plating Bath
Date Published: 2006-04-03
Paper Number:2006-01-1671
DOI: 10.4271/2006-01-1671
Citation:
Watanabe, H., Oshio, M., and Kunieda, N., "Variation in Corrosion Resistance of Trivalent Chromate Coating Depending on Type of Zinc Plating Bath," SAE Technical Paper 2006-01-1671, 2006, doi:10.4271/2006-01-1671.
Trivalent chromate coating is replacing the conventional hexavalent chromate coating applied on zinc plating. Zinc plating uses one of three types of plating baths (zincate, cyanide and chloride) according to the characteristics required of subject parts. It has been recognized that trivalent chromate coating provides different corrosion resistance depending on the type of zinc plating bath used. Zinc plating with chromate coating were analyzed to clarify the cause of the corrosion resistance variation with the type of zinc plating bath. It has been revealed that the chromate coating thickness and the condition of top SiO
2
layer vary with the type of zinc plating bath, resulting in corrosion resistance variation.
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