Process for electrolytically detaching a protective coating from

Details Process for electrolytically detaching a protective coating from Process for electrolytically detaching a protective coating from

1988-12-01

1990-01-16

Valentine, Donald R.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204146, 20412975, 20412995, C25F 500

Patent

active

048941301

ABSTRACT:
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.

REFERENCES:
patent: 2588734 (1952-03-01), Kolodney
patent: 3015630 (1962-01-01), Thompson et al.
patent: 3819494 (1974-06-01), Fountain
patent: 4234397 (1980-11-01), Torrey
patent: 4324626 (1982-04-01), McGivern, Jr.

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