Research on Dynamic Corrosion Behavior and the Microstructure of Biomedical Mg–Y–Zn–Zr–Sr in Simulated Body Fluid Solution after Processing by Solution Treatment

Abstract

Herein, as‐cast Mg–2Y–Zn–0.4Zr–0.3Sr alloy's solution treatment at 500 °C in the range of 10–35 h, and then cooled in 80° warm water, is used to investigate its dynamic corrosion behavior and surface morphology using a dynamic stimulating human environment device. Based on the result of corrosion behavior and microstructure, the alloy is mainly composed of α‐Mg and W‐phase (Mg3Zn3Y2) in Mg–2Y–Zn–0.4Zr–0.3Sr alloy. With the increase in solution time, the corrosion resistance is prompted due to the uniform microstructure and second phase dissolved into the matrix. The corrosion resistance of Mg–2Y–Zn–0.4Zr–0.3Sr alloy is increased by enhancing solution time before 25 h due to the uniformly distributed second phases and microstructure, which can alleviate the galvanic corrosion. However, increasing solution time exceeding 25 h reduces the corrosion resistance of the alloy due to coarse grains. Furthermore, twinning, which appears in grains interior after solution treatment, has a positive influence on corrosion resistance. Therefore, the good corrosion resistance of solution‐treated Mg–2Y–Zn–0.4Zr–0.3Sr alloy makes it excellent for biomaterial applications.