FIELD: chemistry.
SUBSTANCE: aluminium or aluminium-containing anode and copper-plated steel cathode are immersed in an electrolytic bath and voltage of 250-340 V is applied across said electrodes with anode current density of 0.4-0.7 A/cm2 and temperature of the aqueous electrolyte solution of 60-90°C, wherein the electrolyte used is an aqueous solution containing, wt %: ammonium chloride 5-10, potassium chloride 2-6, oxalic acid 1-4 and water - the balance.
EFFECT: polishing the active electrode made of aluminium or aluminium-containing alloy to specular gloss with synchronous removal of the copper layer from the surface of the steel cathode.
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