COATING TYPE SURFACE TREATMENT AGENT OF ALUMINUM OR ALUMINUM ALLOY AND SURFACE TREATMENT METHOD

摘要

PROBLEM TO BE SOLVED: To provide a coating type surface treatment agent capable of forming a coated film to aluminum (alloy) excellent in corrosion resistance, chrome elution resistance and adhesion to a top coated film.;SOLUTION: An agent contains 1-100 g/L total chrome ion (sexivalent chrome ion + trivalent chrome ion), phosphate ion and zirconium fluoric ion, a weight ratio of trivalent chrome ion/total chrome ion is 0.4-0.8 and further, a weight ratio expressed in terms of metal is phosphor/chrome = 0.13 to 1.00 and zirconium/chrome = 0.4 to 2.5.;COPYRIGHT: (C)2000,JPO