Patent ID: 6863738
Filing Date: 2005-03-08
Classification: C23C,C23G

Abstract:
1. A method for removing at least one of: (1) an oxidized product of a substrate from a surface of the substrate, wherein the substrate is a turbine component formed of an alloy selected from the group consisting of a nickel based alloy, a cobalt based alloy, and an iron based alloy, or (2) an oxidized product of a metallic coating disposed on the substrate from a surface of the metallic coating, wherein the substrate is the turbine component formed of the alloy, the method comprising the step of contacting the oxidized product of the substrate or the oxidized product of the metallic coating with an aqueous composition to remove a predetermined amount of the oxidized product of the substrate or a predetermined amount of the oxidized product of the metallic coating, wherein the aqueous composition consists essentially of an acid having the formula H x AF 6 and water, wherein A is selected from the group consisting of Si, Ge, Ti, and Ga; and x is 1-6.