Mechanical Properties of Pb–0.7%Sn–0.08%Ca Positive Grid Alloy for Lead-Acid Batteries

The effects of casting procedure and ageing time on the tensile properties of Pb–0.7%Sn–0.08%Ca positive grid alloy for lead-acid batteries were investigated. As a preheating temperature of a mold during casting increases from 40°C to 170°C, ultimate tensile strength decreases, but elongation increases due to the changes in the grain structure of the alloy. Prolongation of ageing time up to 32 days causes the increase in strength and decrease in elongation, with higher ageing rate observed during first 15 days.