Inhibition Effect of Rare Earth on Magnesium Alloy in NaCl Solution

The effect of CeCl3 on the corrosion behaviors of AZ31 Mg alloy in 3.5% NaCl solution was investigated by means of electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curves. The morphology and chemical composition of the corrosion products were analyzed by SEM and EDS. The results showed that the corrosion rate of AZ31 Mg alloy was reduced by adding CeCl3 with concentrations of 50~200 mg/L, and the lowest corrosion rate was at the concentration of 100 mg/L. Uniformity and density of corrosion product was good, and there were no micro-cracks. The corrosion inhibition effect was confirmed by immersion experiment.