Patent ID: 8524323

Claim:
A surface treatment method for a zinc-based metallic material comprising a surface treatment process in which a surface of a zinc-based metallic material is: brought into contact with a surface treatment liquid comprising components: (A) at least one metallic element selected from the group consisting of Ti, Zr, and Hf; and (B) at least one compound selected from the group consisting of an imino compound, aminated polysaccharide, amino-modified phenol, and derivatives thereof, wherein the total concentration of the metallic elements of said component (A) is 500 to 2000 mg/L, and the total concentration of the compounds of said component (B) is 300 to 3000 mg/L; wherein: Component (A) comprises Zr; Component (B) comprises 1-propane imine; and the surface treatment liquid further comprises: (C) fluorine; (D) metallic elements Mg, Zn and Cu, wherein total concentration of the metallic elements of said component (D) is from 500 to 10000 mg/L.