Surface treating agent for metallic materials, method for surface treating metallic materials using the surface treating agent, and surface treated metallic materials

摘要

Disclosed is a surface treating agent for metallic materials that can form, on the surface of metallic materials, a novel film, which can simultaneously realize, for example, heat resistance, weldability, continuous processability, electrical conductivity, fingerprint resistance, and coatability, and has excellent liquid stability. The surface treating agent for metallic materials contains a compound (A), which contains in one molecule two or more functional groups (a) represented by -SiR1R2R3 and a hydrophilic functional group (b), in which the molecular weight per functional group (b) (average molecular weight/number of functional groups) is in the range of 300 to 5000, at least one metal alkoxide (B) containing one element selected from the group consisting of Si, Ti, and Zr, at least one compound (C) selected from the group consisting of fluorine-containing compounds and phosphoric acid compounds, organic compounds (D) containing at least one hydrophilic functional group selected from the group consisting of a carboxylic acid group, a phosphonic acid group, and a sulfonic acid group, and water.