Selective removal of nickel-based alloys from ferrous-based meta

Details Selective removal of nickel-based alloys from ferrous-based meta Selective removal of nickel-based alloys from ferrous-based meta

1979-11-13

1981-04-14

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204140, C25F 500, C25F 300

Patent

active

042618045

ABSTRACT:
Nickel-based alloys can be removed from ferrous-based metals without damaging the ferrous-based metal by a process comprising immersing the nickel-based alloy/ferrous-based metal composite into an electrolyte solution which will not attack the ferrous-based metal at a specified voltage condition. This voltage condition is imposed across the composite and potentiostatically controlled to produce a nickel-alloy/ferrous-metal current density ratio in the composite which results in etching of the nickel-based alloy with no damage to the ferrous-based metal. The process has particular utility for removing nickel-based alloy brazed vanes from stainless steel shrouds in gas turbine engine stators.

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Metal Industry, Feb. 16, 1945, p. 102.

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