鉛蓄電池用負極集電体に用いるPb合金の充電状態における腐食挙動

抄録

The corrosion behavior of the exposed part of the Pb alloy negative electrode from the electrolyte was analyzed upon charging, i.e., under the reduced state. Dissolved oxygen in the electrolyte affected the generation rate and the grain size of the PbSO₄. From the potential measurements at the exposed part, it was found that the part not under reducing conditions and the generation reaction of PbSO₄ progressed by the Jocal cell reaction. Furthermore, when the dissolved oxygen concentration in the electrolyte film on the exposed part increased, the potential at the exposed part became noble and the PbSO₄ generation rate increased. On the other hand, the most anti-corrosive Pb alloy was the Pb-1.8% Sn-0.03% Se alloy. The reason was attributed to the dense corrosion layer formed on the surface, because the PbSO₄ grain size became small by the synergistic effect of Sn and Se.