Abstract
AZ91D magnesium alloys and ADC12 aluminum alloys die cast panels with paint finishing were exposed for three years. The pretreatment films for painting on AZ91D magnesium alloys were formed from various chemical conversion and anodizing baths, and the films on ADC12 aluminum alloys were formed from chromating. The environmental factors, temperature, precipitation, wetness time, solar and UV radiant, concentration of chloride and sulfur oxide, which are generally believed to be associated with corrosion mechanisms were measured. The chromate and anodic oxide films were superior as pretreatment films for painting on AZ91D magnesium alloys judging from the adhesion of painting and corrosion resistance. And these showed same degree compared with paint coated ADC12 aluminum alloys.
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