Corrosion Regulation of Medical Mg-Zn-Ca Alloys

Three kinds of degradable ternary Mg-Zn-Ca alloys with Ca contents of 0.5%, 1% and 2%, respectively, were fabricated by melting and casting. The mass-loss measurement and electrochemical testing technique were employed to study their corrosion behaviors in Hank’s simulated body fluid. The results show that the corrosion rate of Mg-Zn-0.5%Ca alloy was the lowest. Electrochemical test results show that the capacitive reactance, corrosion potential and polarization residtance of Mg-Zn-0.5%Ca alloy were the highest and the corrosion current density was the lowest. The ternary alloy with 0.5% Ca shows an enhanced corrosion resistance.