Abstract
This work deals with the evaluation and characterization of aluminium (99.61%) and some of its alloys namely, Al—Ga—In, Al—Zn, Al—In, Al—Mn and Al—Mg, as anodes in alkaline battery electrolyte. The self-corrosion rate, hydrogen evolution rate and electrochemical properties, such as open circuit potentials, polarization characteristics and anode efficiencies were examined in 4 M KOH solutions. Among the tested alloys, Al—Ga—In alloy is found to be the most promising since it exhibits high open circuit potential, minimum anodic polarization, good anode efficiency and minimum corrosion rate. On the other hand, Al—In and Al—Mn alloys show higher corrosion rate compared with the other alloys. It can be shown that, a stoichiometric correlation exists between the corrosion rate obtained by weight loss and the hydrogen evolution rate.
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