Electrochemical corrosion parameters of as-cast Al–Fe alloys in a NaCl solution

Abstract

The aim of this study is to evaluate the general electrochemical corrosion resistance of Al–Fe alloys in the range of hypoeutectic compositions, Al–0.5 wt.% Fe and Al–1.5 wt.% Fe alloy. EIS plots, potentiodynamic polarization curves and an equivalent circuit analysis were used to evaluate the electrochemical parameters in a 0.5 M NaCl solution at 25 °C. It is shown that for an Al–0.5 wt.% Fe alloy, coarse cells tend to improve the corrosion resistance mainly due to the reduction in cellular boundaries and for an Al–1.5 wt.% Fe alloy, an opposite trend has been detected.