| 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. |
