POST-TREATMENT COMPOSITION FOR ZINC PHOSPHATE-BASED TREATMENT MATERIAL HAVING EXCELLENT CORROSION RESISTANCE AND TOP COATING SUITABILITY, POST-TREATMENT METHOD, AND POST-TREATED ZINC PHOSPHATE-BASED TREATMENT MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a post-treatment composition for a zinc phosphate-based treatment material capable of giving performance, particularly, corrosion resistance and coating suitability equal to or above that of a material obtained by subjecting a zinc phosphate-based treatment material to post-treatment with the conventional chromate liquid without using hexavalent chromium.;SOLUTION: The post-treatment composition for a zinc phosphate-based treatment material contains: (A) a fluorine-containing compound; (B) a water soluble and/or water dispersible resin compound having a cationic or nonionic properties; phosphoric acid and/or a phosphoric compound; and water, and has a pH of 1 to 6, and the mass ratio of the fluorine-containing compound (A) to the resin compound (B) is 0.020 to 100.;COPYRIGHT: (C)2005,JPO&NCIPI