Robert E. Fishter - Boca Raton FL Henry Lada - Lake Park FL Victoria M. Putnam - Jupiter FL
Assignee:
United Technologies Corporation - Hartford CT
International Classification:
C23F 102 B44C 122
US Classification:
156656
Abstract:
Disclosed is a method for stripping nickel aluminide coatings of up 10 weight percent aluminum from nickel base alloy substrates at room temperature. The preferred solution contains by volume percent 43-45 nitric acid, 7-12 hydrochloric acid, 0. 1-1. 5 sulfuric acid, balance water; it also contains 0. 008-0. 025 moles per liter of ferric chloride, at least 0. 016 moles per liter copper sulfate. The ratio between the sulfate and chloride is 2:1 or greater.