Method for removing a protective coating from a turbine blade airfoil in a repair process

摘要

A method for a repair process includes the steps of subjecting a substrate coated with at least one protective metallic coating to a nitric acid solution (12) and then subjecting the substrate with the at least one protective metallic coating to a hydrochloric acid solution (14) to remove the at least one protective metallic coating from the substrate. The substrate includes about 5 wt% - 15wt% chromium, about 2 wt% - 8wt% cobalt, about 2 wt% - 6wt% tungsten, about 0.5 wt% - 2.5wt% titanium, about 8 wt% - 16wt% tantalum, about 2 wt% - 8wt% aluminum, hafnium in an amount no greater than 1wt%, and a remainder of nickel.