| abstract |
Provided is a surface treatment with zirconium ions, which can exhibit sufficient throwing power and is excellent in anticorrosion properties when cationic electrodeposition is applied to a surface-treated metal substrate. A metal surface treatment solution for cationic electrodeposition coating having a pH of 1.5 to 6.5 containing zirconium ions and tin ions, wherein the concentration of the zirconium ions is 10 to 10,000 ppm, and the zirconium ions The metal surface treatment liquid for cationic electrodeposition coating has a tin ion content of 0.005 to 1 in terms of mass, and may further contain a polyamine compound, copper ion, fluorine ion, or chelate compound. [Selection] Figure 1 |