A method for partially stripping a coating from the surface of a substrate, and related apparatus and compositions

An electrochemical process for selectively stripping at least one coating from the surface of a substrate is disclosed. The substrate (6) (often a turbine engine component) is immersed in a composition (3) through which electrical current flows. The composition (3) includes a halide salt, such as so...

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Bibliographische Detailangaben
Hauptverfasser:	GROSSKLAUS, WARREN DAVIS, WEI, BIN, LAGRAFF, JOHN ROBERT, FERRIGNO, STEPHEN JOSEPH, SHAW, MICHAEL JOSEPH, MACDONALD, LEO SPITZ, COLAIZZI, TRIS
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	APPARATUS THEREFOR CHEMISTRY ELECTROLYTIC OR ELECTROPHORETIC PROCESSES METALLURGY PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROMOBJECTS
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Beschreibung
Zusammenfassung:	An electrochemical process for selectively stripping at least one coating from the surface of a substrate is disclosed. The substrate (6) (often a turbine engine component) is immersed in a composition (3) through which electrical current flows. The composition (3) includes a halide salt, such as sodium chloride, ammonium chloride, and potassium chloride. In preferred embodiments, the electrical current is direct current (dc). The process is especially useful for selectively removing portions of diffusion aluminide coatings. For example, the additive layer can efficiently be removed, without substantially affecting the underlying diffusion layer or substrate. Related stripping compositions and apparatuses are also described.