Etching a substrate: processes – Nongaseous phase etching of substrate – Etching inorganic substrate
Reexamination Certificate
2007-09-18
2007-09-18
Culbert, Roberts (Department: 1763)
Etching a substrate: processes
Nongaseous phase etching of substrate
Etching inorganic substrate
C029S889100, C134S041000
Reexamination Certificate
active
11171686
ABSTRACT:
A method for selectively removing an aluminide coating from at least one surface of a metal-based substrate by: (a) contacting the surface of the substrate with at least one stripping composition comprising nitric acid at a temperature less than about 20° C. to degrade the coating without damaging the substrate; and (b) removing the degraded coating without damaging the substrate. Also disclosed is a method for replacing a worn or damaged aluminide coating on at least one surface of a metal-based substrate by selectively removing the coating using the above steps, and then applying a new aluminide coating to the surface of the substrate. Turbine engine parts, such as high-pressure turbine blades, treated using the above methods are also disclosed.
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Brooks William Clarke
Pilsner Brian H.
Risbeck James Douglas
Rosenzweig Mark Alan
Worthing, Jr. Richard Roy
Culbert Roberts
General Electric Company
Hasse Donald E.
Hasse & Nesbitt LLC
Nesbitt Daniel F.
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