초록 ▼

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.

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.

대표청구항 ▼

The method of removing a nickel aluminide coating from a wrought non-hardenable nickel base alloy characterized by contacting the article with an acid solution consisting essentially by volume percent of 43-45 concentrated nitric acid, 7-12 concentrated hydrochloric acid, 0.1-1.5 concentrated sulfur

The method of removing a nickel aluminide coating from a wrought non-hardenable nickel base alloy characterized by contacting the article with an acid solution consisting essentially by volume percent of 43-45 concentrated nitric acid, 7-12 concentrated hydrochloric acid, 0.1-1.5 concentrated sulfuric acid, balance water; the solution also containing metal chloride and metal sulfate ions.