Method for selectively removing coatings from metal substrates

Details Method for selectively removing coatings from metal substrates Method for selectively removing coatings from metal substrates

C - Chemistry, Metallurgy

23

F

C23F 1/20 (2006.01) C23C 10/48 (2006.01) C23C 10/60 (2006.01) C25F 5/00 (2006.01)

Patent

CA 2611819

Disclosed is a method for selectively removing a coating from a substrate. Aluminum is diffused into the coating. The coating is contacted with an aqueous composition including at least one of an acid having the formula H x AF6, and precursors to the acid, A being selected from the group consisting of Si, Ge, Ti, Zr, Al, and Ga, and x being 1-6. The coating being removed is often an McrAl(X) material. The substrate is a metal, usually a superalloy.

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