HIROHATA, Mikihito

ITOH, Yoshito

KURITA, Koji

For examining deterioration characteristics of several types of anti-corrosive metallic coatings under acid rain, an accelerated exposure test during 300 days was performed. The coating thickness after 300 days became 10% in the Zn hot-dip galvanizing, 20% in the Zn-AI alloys and around 30% in the Zn-AI pseudo-alloys and the AI compared with their virgin states. For evaluating repair effects of painting on deteriorated metallic coatings, the same accelerated exposure test was performed on the repaired specimens by painting after removing the rust on them. The residual metallic coatings largely affected the durability of the repair paints on them. Although the degree of the effect depended on the types of the metallic coatings there was a risk that the durability of the repair paints became lower than that of the paint coatings on the virgin specimen due to the residual metallic coatings. The results indicated that the residual thickness of the deteriorated metallic coatings should be noted in repairing them by painting

Deterioration Characteristics of Anti-corrosive Metallic Coatings under Acid Rain and Application of Paint Repair

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