Abstract
The aim of this article is focused on a comparative experimental study of the electrochemical feature of as-cast Pb–2.2wt.% Sb alloy with cellular/dendritic transition for applications in the manufacturing of lead-acid battery parts. A water-cooled unidirectional solidification system is used to obtain the alloy samples. Electrochemical impedance spectroscopy (EIS) plots, potentiodynamic polarization curves and equivalent circuit analysis are used to evaluate corrosion resistance in a 0.5M H2SO4 solution at 25°C. The cellular Pb–2.2wt.% Sb alloy is found to have a current density which is of about 3 times lower than that of the dendritic Pb–2.2wt.% Sb alloy. The Pb–2.2wt.% Sb alloy has lower current density than both the Pb–1wt.% Sb and the Pb–6.6wt.% Sb alloys evidencing its potential for application as positive grid material in lead-acid batteries. It is also verified that a conventional casting with low cooling rate of about 0.6°Cs−1 produces coarser cellular spacings which is more appropriate for the manufacturing of the Pb–2.2wt.% Sb alloys grids due to its corresponding electrochemical behavior.
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