C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
149/23
C09K 13/06 (2006.01) C09K 13/08 (2006.01) C23F 1/44 (2006.01) C23G 1/10 (2006.01)
Patent
CA 1185152
SELECTIVE CHEMICAL REMOVAL OF HARD SURFACE COATINGS FROM SUPPERALLOY SUBSTRATES ABSTRACT This invention consists of a chemical stripping composi- tion comprising an aqueous solution of H2SO4, a nitro-substituted aromatic compound, a fluoride ion producing species, and a surfac- tant, together with an accompanying method wherein the composition can selectively remove hard surface layers deposited through flame, plasma spray, and detonation gun techniques on superalloy substr- ates by contacting the above stripping solution in a heated bath wherein the bath is continuously agitated by an ultrasonic agitation means. BACKGROUND OF THE INVENTION This invention is related to the removal of ceramic, cermet and metallic coatings from high strength, high temperature re- sistant metal substrates and more particularly, to the removal of these hard surface coatings from superalloys, particularly nickel- base substrates by use of an aqueous acidic stripper bath equipped with a high energy density agitation means. One of the most difficult requirements in the chemical stripping art has been to develop a composition which will chemi- cally remove the "hard surface" coatings, that is, molten particle coatings which are applied by detonation gun, plasma, and flame spray methods onto metal surfaces, such as the nickel-base jet engine combustion chambers. Such coatings, which are usually applied in thin layers to provide protection against high temper- ature oxidative gas streams, include heat resistant ceramics, cermets, and nickel-base mixtures. -1-
415360
Bleeks Thomas W.
Brindisi Frank Jr.
Burns Debra A.
Sullivan Thomas E.
Enthone Incorporated
Ridout & Maybee Llp
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