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In this study, effects of manganese and magnesium content on the electrochemical properties of Al-Zn-In sacrificial anode were studied in 0.5 mol/L NaCl solution (pH=5). The aluminum base alloy with different amounts of Mn and Mg were melted at 750℃, then casted at molds at 25℃. Corrosion experiments were mounted to determine the optimal eeeect of Mn and Mg on the effciencies of the aluminum alloy anodes. The corroded and unexposed sample surfaces were subjected to microstructure characterization by optical and scanning electron microscopy. Al-Zn-In alloy doped with 0%, 0.01%, 0.05%.0.2% and 0.3% by weights of Mn and 0%, 0.5%, 1.0%, 1.5%, 2.0%, 2.5% and 3.0% by weights of Mg were prepared to determine the effect of Mn and Mg on anode effciency in the environment. The different microstructures of the evolved Al- Zn-In-Mg-Mn alloy were correlated with the anode effciencies. The Al-5.0%Zn-2.0%Mg-0.15%Mn-0.02%In gave the best anode effciency (about 83%). The microstructures of the corroded surface of the optimized alloy revealed decreased distribution of the pockets of localized attacks which are characteristics of pitting (or crevice) corrosion.
The aluminum base alloy with different amounts of Mn and Mg were melted at 750 ° C, then casted at molds at 25 ° C Corrosion experiments were mounted to determine the optimal eeeect of Mn and Mg on the effciencies of the aluminum alloy anodes. The corroded and unexposed sample surfaces were subjected to microstructure characterization by optical and scanning electron Al-Zn-In alloy doped with 0%, 0.01%, 0.05% .0.2% and 0.3% by weights of Mn and 0%, 0.5%, 1.0%, 1.5%, 2.0%, 2.5% and 3.0% by weights of Mg were prepared to determine the effect of Mn and Mg on anode effciency in the environment. The different microstructures of the evolved Al-Zn-In-Mg-Mn alloy were correlated with the anode effciencies. The Al-5.0% Zn- 2.0% Mg-0.15% Mn-0.02% In gave the best anode effciency (about 83%). The microstructures of the corr oded surface of the optimized alloy revealed decreased distribution of the pockets of localized attacks which are characteristics of pitting (or crevice) corrosion.