Method and composition for removing nickel aluminide coatings fr

Details Method and composition for removing nickel aluminide coatings fr Method and composition for removing nickel aluminide coatings fr

1982-03-18

1984-01-10

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

134 3, 156664, 156665, 252 792, C23F 102, B44C 122

Patent

active

044251858

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.

REFERENCES:
patent: 4032359 (1977-06-01), Fisher et al.
patent: 4274908 (1981-06-01), Fishter et al.
patent: 4302246 (1981-11-01), Brindisi, Jr. et al.
patent: 4325756 (1982-04-01), Brown et al.
patent: 4339282 (1982-07-01), Lada et al.
patent: 4353780 (1982-10-01), Fishter et al.

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