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 local 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.
|Number of pages||6|
|Publication status||Published - 1 Feb 2005|
- Lead-acid Battery
- Negative Electrode upon Charging
- Pb Alloy