STUDY ON THE CORROSION RESISTANCE OF HOMOGENEOUS Mg-1Bi-0.5x (x=Nd,Ce,La) ALLOYS

Mg alloys are widely used in the aerospace and automotive industries, as well as in electronic products due to their low density and high specific strength. However, the poor corrosion resistance of Mg alloys limits their applications. Rare earth elements have been shown to improve the corrosion resistance of alloys. In this study, Mg-1Bi-0.5x (x = Nd, Ce, La) alloys were prepared by alloying with Bi, Nd, Ce, and La. The microstructure and corrosion behavior of Mg-1Bi-0.5x (x = Nd, Ce, La) alloys were investigated using X-ray diffraction (XRD), optical microscopy (OM), scanning electron microscopy (SEM), hydrogen evolution tests, weight loss experiments, and electrochemical measurements. The results indicate that the Mg-1Bi-0.5Nd alloy exhibits higher corrosion potentials and lower corrosion current densities, indicating superior corrosion resistance. This improvement is attributed to the formation of a more stable and uniform film of corrosion products, which prevents further corrosion and enhances corrosion resistance.