| abstract |
PROBLEM TO BE SOLVED: To improve the corrosion resistance and adhesion of a resin film formed on a metal surface and to make the quality uniform by using a self-deposition type aqueous resin composition. Providing a way. SOLUTION: A water-dispersible or water-soluble resin containing a carboxyl group and / or a hydroxyl group on a metal surface, an acid, A resin film is formed from an autodepositable new type aqueous resin composition containing an oxide and (if necessary, a metal ion), and while the film is in an uncured state, an alkoxymethyl group, a methylol group, and an imino group are formed. A post-treatment is carried out with an aqueous solution containing two or more water-soluble amino resins (10 to 100 g / l) and an amine compound (0.5 to 5.0 g / l), and the resulting film is dried and cured. |