US Patent Application 20080202552 - Method for selectively removing coatings from metal substrates
InventorsUS Classes134/2, For metallic, siliceous, or calcareous basework, including chemical bleaching, oxidation or reduction134/3, Including acidic agent134/26, Using sequentially applied treating agents134/28, One an acid or an acid salt134/30, Including steam, gaseous agent or temperature feature134/42, Miscellaneous134/41Metal base work, acid treatingAttorney, Agent or FirmInternational ClassesC23G 1/00C23G 1/02 B08B 3/00 B08B 7/00 Abstract textDisclosed 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 HxAF6, 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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