| abstract |
A zinc galvanized steel material coated with a mixed film, which is excellent in corrosion resistance, lack of susceptibility to blackening, coating adhesion, and alkali resistance unlike galvanized steel materials treated by conventional chromate substituted techniques. The zinc galvanized steel material coated with a mixed film has a mixed coating film formed by applying a treatment liquid comprising a basic zirconium compound, a vanadyl-containing compound (VO2 +) onto the surface of a galvanized steel material. , a phosphoric acid compound, a cobalt compound, an organic acid and water having a pH of 7-14 and drying the liquid. It is characterized in that this mixed coating film contains 10-45% mass V, 5-100% mass P, 0.1-20% mass Co and 10-90% masses of the organic acid based on Zr. |