COMPOSITION AND TREATING LIQUID FOR TREATING SURFACE OF METALLIC MATERIAL, SURFACE-TREATED METALLIC MATERIAL, COATED METALLIC MATERIAL, AND PROCESSES FOR PRODUCING THESE

摘要

A coated metallic material which comprises a metallic material having a bag structure part and an indium-containing coating film formed on at least part of the surface thereof, the outermost surface having a proportion by number of indium atoms of 10 at.% or higher. The surface-treated metallic material having a bag structure part can be produced with an environmental burden as light as in a chemical treatment with zirconium. It has corrosion resistance and adhesion to coatings. It has high throwing power in cationic electrodeposition.