EFFECT OF TIN ADDITION ON THE DEGRADABILITY AND CORROSION PROPERTIES OF A NEW Zn-1.0 WT.% Mg ALLOY

摘要

In this study, to investigate effects of tin addition on the microstructures and corrosion properties, Zn-1Mg-xSn (x = 1.0, 2.0 and 5.0 wt.%) ternary zinc alloys were prepared. The experimental results indicated that the Zn-1Mg-2.0 wt.% Sn alloy has the bet-ter mechanical properties compared with pure zinc and Zn-1Mg alloy. The tensile strength of the alloy material is 173.2 +/- 3.7 MPa, the yield strength is 120.7 +/- 2.4 MPa, the elongation is 5.64 +/- 0.08% and the hardness is 76.9 +/- 0.8 HV. The average degradation rate of the alloys immersion in SBF solution for 60 days is 0.16 +/- 0.03 mm/year, and the Zn-1Mg-2.0 wt.% Sn alloy hemolysis rate is only 0.81 +/- 0.02%. It is confirmed that the addition of tin is effective to improve the mechanical properties and degradation of Zn-1Mg alloy. It may be a candidate of the clinical application requirements of the degradable implant materials in orthopedics.

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