Research on Mechanical and Corrosion Properties of Medical Degradable Zn-Sn-Cu Alloys
Biodegradable zinc(Zn)and its alloys have great potential to be used for biomedical materials due to their suitable degradation rate and good biocompatibility.However,the lack of mechanical properties of pure zinc,such as low strength and poor plasticity,limits its clinical application.Here,a new ternary Zn-3Sn-xCu(x=0,1,2,3wt%)alloy was prepared by gravity casting in order to obtain better corrosion resistance and biocompatibility and improve the mechanical properties by microalloying with copper(Cu).The microstructure,mechanical properties and corrosion resistance were analyzed by metallographic analysis,tensile test,microhardness test,electrochemical and immersion test.The results show that the addition of Cu makes the alloy have higher strength and hardness.The in vitro degradation test shows that the degradation rate of Zn-3Sn-xCu(x=0,1,2,3wt%)alloy is significantly higher than that of Zn-3Sn alloy,which can meet the standard of degradable medical materials,and is expected to become a new degradable medical material.
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