| 摘要 |
Disclosed is a coating composition for precoated metal material excellent in electrodeposition coating performance, possessing high corrosion-resistance and high processing adhesion, and capable of forming a coat film applicable to spot welding. The coating composition for precoated metal material in the present invention comprises, as essential ingredients, a binder resin possessing film-forming capability, a hydrophilic resin for performing electrodeposition coating uniformly, and fine granular silica for enhancing corrosion-resistance, being dissolved or dispersed in organic solvent, is characterized by that the binder resin is such as having a number-average molecular weight of 600 to 100,000 with containing 25 or more mol% of an aromatic hydroxy compound in its constituent monomer, and the hydrophilic resin is a polyamine resin and/or polyimine resin having a number-average molecular weight of 600 to 100,000 with containing 25 or more mol% of an amine compound in its constituent monomer.
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