Abstract:

The anodic behaviors of Pb-0.07% Ca-1.2% Sn-0.05% Al-0.1% Ag-(0, 0.01%, 0.15%, 0.5%) mixed rareearth alloys in sulfuric acid solution were studied by means of electrochemical impedance spectroscopy(EIS), A.C. voltammetry, cyclic voltammetry and corrosion mass loss tests, respectively. The experimental results show that the mixed rare-earth in the Pb Ca-Sn-Al-Ag alloy can improve the corrosion resistance. Moreover, the oxygen overpotentials of the electrodes with mixed rare earth are higher than those of their counterparts. The results show that the addition of rare-earth can inhibit the growth of the anodic Pb(Ⅱ) oxides and can also improve the corrosion resistance. It was shown that rare earth element can compensate for the effect of premature capacity loss for the Pb-Ca-Sn-Al-Ag content. The La-Ce mixed rare earth with a content of 0.5% exhibited better comprehensive performances in all aspects.

Key words: Lanthanum-Cerium rare-earth, Anodic Pb (Ⅱ) film, Grid alloy, Lead–acid battery,