AQUEOUS COMPOSITION FOR METAL SURFACE TREATMENT, METHOD FOR METAL SURFACE TREATMENT USING COMPOSITION, AND METHOD FOR PRODUCING METAL MATERIAL HAVING FILM, AS WELL AS METAL SURFACE TREATMENT FILM USING SAME

摘要

[Problem] To provide means for dramatically improving Bi precipitation and preventing deterioration of metal film appearance in the form of fisheyes, dimples, and the like. [Solution] An aqueous composition for metal surface treatment is characterized in being an aqueous composition for metal surface treatment containing a cationic resin emulsion, wherein the dispersoid of the cationic resin emulsion comprises an amino compound of a modified epoxy resin, a block polyisocyanate, and a tin compound represented by formula 1(1)(where in formula 1, m is 4 or greater and n is between 0 and 10), and the dispersion medium of the cationic resin emulsion contains Bi ions.