Method for hydrophilic treatment of metal surface

摘要

The present invention is to provide a hydrophilic treating method of the surface of metal comprising, the first process which treat the surface of metal with a chemical conversion solution to form a chemical conversion film on the metal surface while etching the metal surface and the second process which remove said film formed on the surface of metal to obtain rougher surface, and the final process which forms a hydrophilic film on the surface of metal. Desirably the surface roughness indicated by Rz after above mentioned second process is rougher than 1.5 mum.