Patent ID: 7578921
Filing Date: 2009-08-25
Classification: C25D,Y10T

Abstract:
1. A method of forming a protective coating on a surface of an aluminum, aluminum alloy, titanium or titanium alloy article, said method comprising: A) providing an anodizing solution comprised of water, a phosphorus containing acid and/or salt, and one or more additional components selected from the group consisting of: of elements selected from the group consisting of Ti, Zr, Hf, Sn, Al, Ge and B and mixtures thereof; B) providing a cathode in contact with said anodizing solution; C) placing an aluminum, aluminum alloy, titanium or titanium alloy article as an anode in said anodizing solution; and D) passing a pulsed direct current between the anode and cathode through said anodizing solution for a time effective to form a protective coating on at least one surface of the article.