Abstract
The corrosion rate of AZ31 magnesium alloy during the discharge of anode-limited magnesium/silver chloride cells in different concentrations of sodium chloride is investigated by the gasometric technique. Corrosion rates are measured at different temperatures. From the data obtained, the cell capacity realised and the capacity loss due to local galvanic action of magnesium alloy are calculated. The variation of the rate of gas evolution and the total volume of gas collected at the end of discharge is explained on the basis of negative difference (i.e., increase of wasteful corrosion with increase in current density) and chunk effects (i.e., breakdown of hydroxide film along with magnesium particles at high current density).
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