AQUEOUS CHEMICAL CONVERSION TREATMENT SOLUTION FOR FORMING CHROMIUM FREE CHEMICAL CONVERSION FILM ON ZINC OR ZINC ALLOY PLATING, AND CHROMIUM FREE CONVERSION FILM OBTAINED THEREBY

摘要

PROBLEM TO BE SOLVED: To provide a film which does not contain chromium and has the corrosion resistance equivalent to or higher than that of the conventional hexavalent chromate or trivalent chromium chemical conversion treatment film.;SOLUTION: The aqueous chemical conversion treatment solution for forming the chromium free chemical conversion treatment film on the zinc or zinc alloy plating is characterized by containing a water-soluble aromatic compound having (A) a Ti metal base, (B) an oxidizing substance, (C) an oxygen acid salt of phosphorus, (D) a complex compound, and (E) a nitro group. Also, the chromium free chemical conversion treatment film is formed by bringing the aqueous chemical conversion treatment solution into contact with the zinc or zinc alloy plating on a substrate.;COPYRIGHT: (C)2010,JPO&INPIT