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Characteristics of Al 2 O 3 Dispersed Zn-Co-Cr
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Abstract
Al2O3 -dispersed Zn-Co-Cr alloy electroplated has been developed for automobile use. Optimum coating composition ranges from 0.5 to 2.0wt% for Co, 0.3 to 1.0wt% for Cr, and 0.1 to 2.0wt% for Al2O3. The coating showed excellent corrosion resistance with and without paint. Superior anti-corrosive property of the coating results from the formation of the mechanically and chemically stable corrosion products, ZnCl2 −4Zn (OH)2, and the passivation in anodic polarization. The coating also showed good stone chipping resistance as well as paintability, formability, and weldability. Accordingly Al2O3 -dispersed Zn-Co-Cr alloy electroplated is suitable for application to both unexposed and exposure parts, including interior and exterior surfaces.
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Citation
Coating, A., Umino, S., Yamato, K., Kimura, H. et al., "Characteristics of Al2O3 Dispersed Zn-Co-Cr," SAE Technical Paper 892561, 1989, https://doi.org/10.4271/892561.Also In
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