Cleaning and liquid contact with solids – Processes – For metallic – siliceous – or calcareous basework – including...
Patent
1998-02-02
1999-08-31
El-Arini, Zeinab
Cleaning and liquid contact with solids
Processes
For metallic, siliceous, or calcareous basework, including...
134 28, 134 38, 134 41, 252 792, B08B 308, C09K 1304, C23G 102
Patent
active
059449098
ABSTRACT:
A method of removing metallic compositions, such as abradable rub coatings, environmental coatings, bond coats and braze alloys, from the surface of a cobalt-base substrate, such as turbine shrouds and vanes of gas turbine engines. The method is particularly suited for the removal of nickel-base braze alloys and aluminum-containing coatings, the latter of which includes abradable MCrAlY coatings and environmentally-protective diffusion aluminide coatings. The process generally entails contacting such metallic compositions with an aqueous solution containing hydrochloric acid and nitric acid and at a solution temperature of about 130.degree. F. to about 180.degree. F. The solution completely removes nickel-base alloys and aluminum-containing compositions from a cobalt-base substrate without removal or damage to the underlying substrate.
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Charles Patricia A.
Farr Howard J.
Grossklaus, Jr. Warren D.
Hemsath Eric C.
Hobbs Randall L.
El-Arini Zeinab
General Electric Company
Gressel Gerry S.
Hess Andrew C.
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