Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1984-11-05
1985-09-03
Tufariello, Thomas
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204228, C25F 500, C25F 700
Patent
active
045390878
ABSTRACT:
A method for electrolytic removal of a galvanic nickel, chromium or gold layer from a metal base of copper or copper alloy, which is carried out in a bath comprising sulphuric acid and phosphorous acid and/or an organic acid in a concentration, in which the potential of the outer layer is negative and that of the metal base is positive relative to the bath. With such conditions the outer layer will be electrolytically removed and the surface of the metal base gets passive. The removal is finished when the current through the bath decreases below a predetermined threshold value.
The apparatus for carrying out the method comprises a current sensor for detecting the current, and if the current decreases below the threshold value, the sensor turns on a current breaker for breaking the current through the bath.
REFERENCES:
patent: 3649489 (1972-03-01), Dillenberg
patent: 3788958 (1974-01-01), Dillenberg
patent: 3793172 (1974-02-01), Cadieux
patent: 3826724 (1974-07-01), Riggs, Jr.
patent: 3886055 (1975-05-01), Baboian
patent: 3900375 (1975-08-01), Baboian
patent: 3943043 (1976-03-01), Billington
Magyar Ferenc
Pojbics Jeno
Latszereszeti Eszkozok Gyara
Tufariello Thomas
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