Intensification of the rate of electropolishing and diffusion controlled electrochemical machining by workpiece oscillation

Chloride ion inhibition of electrochemical oscillations on the anode of an electrolytic manganese metal cell

In industrial electrolytic manganese metal process, the energy consumption closely related to the electrolysis of cathode and anode. The effect of Cl^- concentration on electrochemical oscillation at the anode of the electrolytic manganese metal cell was investigated. The results showed that the electrochemical oscillation at the anode was inhibited by Cl^-, and the amplitude and frequency of the electrochemical oscillation decreased as the increase of Cl^- concentration. When the concentration of Cl^- was 2.68 g/L, the cathode and anode electrodes could be effectively activated, and the manganese current efficiency reached its minimum, correspondingly, the power consumption reached its maximum. In addition, the presence of the chloride reduced the production of MnO₂ at the anode surface. ClO₄^- and free ions formed insoluble amorphous structures on the surface of the anode with the increase in reaction time and chloride ion concentration, and the insoluble amorphous structures prevented further generation of MnO₂. Thus, electrolytic manganese metal energy consumption decreased.