Abstract
This work underlines the influence of alloying elements zinc and gallium on the electrochemical behaviour of aluminium alloys used as sacrificial anodes. Both the single and joint effects of these two elements on the free corrosion potential, the corrosion current density, and the development of the passive region were studied. Coupled potential and efficiency measurements were also carried out. It has been shown that the influence of gallium on the extent of the negative shift in corrosion potential of aluminium is greater than that of zinc. As regards the joint influence of the two elements, zinc was found to reduce the extent of the gallium induced negative shift in potential. Finally, for any composition the efficiencies were low, possibly because of partial segregation in these alloys.
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