Stripping composition and process for selective removal of elect

Details Stripping composition and process for selective removal of elect Stripping composition and process for selective removal of elect

1985-10-30

1987-03-03

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

C25F 500

Patent

active

046473521

ABSTRACT:
A water-based composition for selective stripping of electroless applied nickel from ferrous, titanium and aluminum substrates is disclosed which includes a quantity of a chromic acid which functions as an oxidizing and electrolytic agent, an amount of globular sodium bisulfite which causes the chromium in the solution to substantially remain in a trivalent state, and a sufficient amount of phosphoric acid as a catalyst to enhance removal of electroless applied nickel by the oxidizing and electrolytic agent. Accelerated removal of electroless applied nickel is accomplished by confining the stripping composition in an enclosure, introducing a nickel-coated substrate into the stripping bath, providing a ferrous surface in the bath, connecting a DC source to the substrate serving as an anode while the ferrous surface functions as the cathode, maintaining the DC source at a voltage of about 6 volts, and heating the bath to a temperature of about 120.degree. F.

REFERENCES:
patent: 4356069 (1982-10-01), Cunningham

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