| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrodeposition coating composition capable of providing a coating film having excellent corrosion resistance and coating film smoothness.SOLUTION: The electrodeposition coating composition includes a dissolved metal compound (A) containing one or more metals selected from the group comprising of Ti, Bi, Zn, Y, Ne, La, Ce, Ni and Zr, an aminated resin (B), a hardener (C) and a metal nitrite (D), wherein the aminated resin (B) has a number-average molecular weight of 1,000-5,000, an amine value of 20-100 mg-KOH/g, and a hydroxyl value of 50-400 mg-KOH/g, and the hardener (C) is a blocked-isocyanate hardener. In the case when the aminated resin (B) has reacted with the blocked-isocyanate hardener in an electrodeposition coating film during thermal hardening, the theoretical residual hydroxyl value is 50-350 mg-KOH/g. |
