Method for removing aluminide coating from metal substrate and turbine engine part so treated
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United States of America Patent
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Sep 18, 2007
Grant Date -
Nov 3, 2005
app pub date -
Jun 30, 2005
filing date -
Jan 9, 2003
priority date (Note) -
Expired
status (Latency Note)
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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.degree. 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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