Patent ID: 6494960
Filing Date: 2002-12-17
Classification: C23F

Abstract:
A method for removing an aluminide coating from a surface of a substrate, comprising the steps of:contacting the surface of the substrate with at least one stripping composition, said stripping composition comprising an aliphatic or aromatic sulfonic acid, and at least one inorganic additive, said at least one inorganic additive selected from a group consisting of a. secondary acids selected from a group consisting of nitric acid, hydrochloric acid, phosphoric acid, perchloric acid, triflic acid, trifluoroacetic acid, sulfuric, boric, hypophosphorous, and combinations thereof, b. complexing agents selected from a group consisting of halides, oxyhalides, sulfates, phosphates, and nitrates, c. oxidizing agents selected from a group consisting of nitrate and nitrous salts; chloride salts; hydride and fluoride salts; sulfate, sulfite, and sulfide salts; phosphate and phosphite salts; borate salts; fluoro- and chloro-aluminate salts; oxyhalide salts; peroxides; and manganate salts, and d. reducing agents; and removing the coating.