SURFACE-TREATED METAL MATERIAL AND MANUFACTURING METHOD THEREFOR

摘要

Provided are a surface-treated metal material consisting of a film formed on the surface of a metal material, and a manufacturing method therefor. The film comprises an organic resin (A) having a glass transition point greater than 35°C and no greater than 100°C, and an organic resin (B) having a glass transition point greater than 100°C and no greater than 250°C. The difference between the glass transition point of the two organic resins (A and B) is at least 50°C. The film does not contain substances that burden the environment, such as hexavalent chromium, and has superb press formability, post-forming corrosion resistance, and resistance to scratches.