Method for removing a protective coating from a turbine blade airfoil in a repair process

A method for a repair process includes the steps of subjecting a substrate coated with at least one protective metallic coating to a nitric acid solution (12) and then subjecting the substrate with the at least one protective metallic coating to a hydrochloric acid solution (14) to remove the at lea...

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Bibliographische Detailangaben
Hauptverfasser:	EVERETT, CLYDE R, DRAGHI, PETER J, VALEZ, RAMON M
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BLASTING CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL COMBINED OPERATIONS DIFFUSION TREATMENT OF METALLIC MATERIAL ENGINE PLANTS IN GENERAL HEATING INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LIGHTING MACHINE TOOLS MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25 NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES OTHER WORKING OF METAL PERFORMING OPERATIONS STEAM ENGINES TRANSPORTING UNIVERSAL MACHINE TOOLS WEAPONS
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Beschreibung
Zusammenfassung:	A method for a repair process includes the steps of subjecting a substrate coated with at least one protective metallic coating to a nitric acid solution (12) and then subjecting the substrate with the at least one protective metallic coating to a hydrochloric acid solution (14) to remove the at least one protective metallic coating from the substrate. The substrate includes about 5 wt% - 15wt% chromium, about 2 wt% - 8wt% cobalt, about 2 wt% - 6wt% tungsten, about 0.5 wt% - 2.5wt% titanium, about 8 wt% - 16wt% tantalum, about 2 wt% - 8wt% aluminum, hafnium in an amount no greater than 1wt%, and a remainder of nickel.