PRETREATMENT METHOD FOR COATING AND FORMED ARTICLE

摘要

PROBLEM TO BE SOLVED: To provide a pretreatment method for electrodeposition coating for a metallic molding by which, in electrodeposition coating, the surface of a coating film is made uniform, and its good appearance can be obtained. SOLUTION: In this pretreatment method for coating, a galvanized steel sheet coated with a phosphate film with a film amount of 0.1 to 2 g/m2 is molded, and the above molding is subjected to phosphate film conversion treatment and water washing after the chemical conversion. The pH of the water washing solution in the water washing after the chemical conversion is controlled to the range of 4 to 7.