EP 0318886 B1 19920722 - PROCESS FOR THE ELECTROLYTIC STRIPPING OF A PROTECTIVE COATING, HAVING A HIGH CONTENT OF CHROMIUM AND NICKEL AND/OR COBALT, FROM THE SUBSTRATE OF AN OBJECT MADE OF A SUPERALLOY
Title (en)
PROCESS FOR THE ELECTROLYTIC STRIPPING OF A PROTECTIVE COATING, HAVING A HIGH CONTENT OF CHROMIUM AND NICKEL AND/OR COBALT, FROM THE SUBSTRATE OF AN OBJECT MADE OF A SUPERALLOY
Publication
Application
Priority
CH 467387 A 19871201
Abstract (en)
[origin: US4894130A] Process for electrolytically detaching a high chromium and nickel and/or cobalt containing protective coating (7) from a base metal (4) that is made of a nickel-based or cobalt-based superalloy by means of activation in NaOH and HCl and subsequent submersion as the anode into an electrolyte (2), which contains oxidizing components that release oxygen. In the electrolytic process the chromium-depleted and nickel-enriched diffusion zone (9) of the protective coating (7) is preferably attacked and detached; said zone developing electro-negatively with respect to the surrounding regions.
IPC 1-7
IPC 8 full level
CPC (source: EP US)
Designated contracting state (EPC)
CH DE LI NL
DOCDB simple family (publication)
EP 0318886 A1 19890607; EP 0318886 B1 19920722; DE 3873038 D1 19920827; US 4894130 A 19900116
DOCDB simple family (application)
EP 88119777 A 19881128; DE 3873038 T 19881128; US 27846788 A 19881201