ZINC SUBSTITUTION METHOD FOR ALUMINUM OR ALUMINUM ALLOY SURFACE, SUBSTITUTION SOLUTION THEREFOR AND ALUMINUM OR ALUMINUM ALLOY HAVING ZINC SUBSTITUTION FILM

摘要

PROBLEM TO BE SOLVED: To prepare a zinc substitution film, or the like, giving a dense zinc substitution film having adhesion without exerting undesirable influence on an aluminum stock as the object to be treated instead of the conventional zincate treating soln. ;SOLUTION: An aq.soln. for subjecting the surface of an aluminum stock to zinc substitution in an acidic region is prepared, the soln. contains a zinc compd. by 1 to 50 g/L expressed in terms of metallic zinc and a fluorine compd. by 0.1 to 20 g/L expressed in terms of fluorine ions in the soln., and the pH of the solution is 1 to 5. As to the method for substituting the surface of an aluminum stock with zinc, the soln. is utilized. The aluminum stock is the one forming the zinc substitution film obtd. in this way.;COPYRIGHT: (C)2000,JPO