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Al-Zn-In anodes show better performance due to the beneficial effects of Zn and In on prevention of aluminum passivity and producing a homogeneous structure for uniform corrosion of the anodes. However, there are different views about the optimum concentration of each element in the anode. In this study, the anodic behavior of Al-Zn-In alloy with different concentrations of zinc from 1 to 6 wt.% and indium from 0.01 to 0.05 wt.% are studied. The NACE efficiency test and polarization are used in 3 wt.% NaCl solution for corrosion characterization. The results showed that zinc and indium change the anode potential to more active potentials and improve the microstructure uniformity of anodes. The latter leads to more uniform corrosion. Optimum concentrations of zinc (5 wt.%) and indium (0.02 wt.%) were found in this respect.

Anodic behavior of Al–Zn–In sacrificial anodes at different concentration of zinc and indium