Influence of Indium on the Corrosion-electrochemical Properties of Aluminum Alloy AlFe5Si10

It is known that industrial aluminum with a high content of iron, silicon and other impurities cannot be used in industry due to its low performance characteristics. Hence, the development of new alloy compositions based on such a metal is a very urgent task. According to the diagram of the state of the Al-Fe-Si system, according to recent data, two triple phases Fe₂SiAl₈ (α) and FeSiAl₅ (β) are in equilibrium with an aluminum solid solution in this system. The third phase FeSi₂Al₄ (γ) is present in silicon-rich alloys and the fourth phase FeSiAl₃ (δ) crystallizes in alloys, rich in iron and silicon. With a higher content of iron and silicon, many other triple phases crystallize. An alloy of the composition AlFe5Si10 was adopted by us as a model alloy and was alloyed with indium.

The article uses the potentiostatic method in the potentiodynamic mode at a potential sweep rate of 2 mV/s to study the electrochemical properties of an aluminum alloy, AlFe5Si10, with indium, in a NaCl electrolyte. It has been found that indium doping is up to 3.0 %_wt. AlFe5Si10 aluminum alloy increases its anodic stability by 50% in the environment of NaCl electrolyte. At the same time, with an increase in the concentration of the alloying component, a change in the positive direction of the ordinate axis of the potentials of free corrosion, pitting, and repassivation of alloys is noted. With an increase in the concentration of chloride ion in the electrolyte, the potentials of free corrosion, pitting formation and repassivation of alloys decrease, and the corrosion rate increases.

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