ON THE USE OF PLATINIZED AND ACTIVATED TITANIUM ANODES IN SOME ELECTRODEPOSITION PROCESSES

Substitution of classical lead anodes containing 6-8% of antimony, 4-6 % of tin or 0.75-1.00% of silver in the zinc electrowinning and hard c hromium plating bath with platinized and activated titanium anodes is discussed in this paper. Depending on the type of electrochemical proc esses, the main effects of this substitution are as follows: smaller e lectrical energy consumption, better current efficiency, increased cel l capacity, smaller electrode gap, higher purity of the deposit and sa vings in manpower and chemicals. Ti/Pt, Ti/Pt-IrO2, Ti/RuO2, Ti/Pt-IrO 2-MnO2, Ti/Pt-IrO2-PbO2, Ti/Pt-IrO2-RuO2, Ti/MnO2, Ti/RuO2-MnO2 and Ti /PbO2 coated titanium anodes have been tested in synthetic as well as in industrial electrolytes. At working current densities some activate d titanium anodes showed lower overpotential than the lead anode. Thes e electrodes have continued to perform in this way during a one-year t est in synthetic and industrial electrolytes so far. No signs of corro sion of the electrodes have been noticed during the test.