Abstract
It has been generally considered that major substances suspended in zinc electrolyte are lead compounds such as PbO2, PbO, PbSO4, Pb and manganese dioxide particles. The experiments, were -made on various properties of these particles in the solution, i. e., the variations of coagulation, electrophoresis, settling rate of suspension, pH value etc. From theabove experiments, it was considered that lead peroxide particles, which aremost harmful in zinc deposit, are positively charged by absorbing hydrogen ion in zinc electrolyte, and deposited on the cathode with zinc by the electrophoresis, but this hydrogenion is exchanged by the presence of manganese dioxide particle and the deposition of lead peroxide on the cathode is prevented.Next, the preventive phenomenon to deposit of lead peroxide particle on the cathode was compared with regard to manganese dioxide and ion exchange resins. From this experimental results, it was considered that the properties of manganese dioxide particle has a, selective ion exchange to hydrogen ion on lead peroxide particle.
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