In vitro corrosion behavior and mechanical properties of biodegradable medical Zn-3Al-1Mg alloy
The tubular Zn-3Al-1Mg alloy was prepared by hot extrusion.The microstructure and mechanical properties of as-cast and extruded tubular Zn-3Al-1Mg alloy were studied.The corrosion behavior of extruded tubular Zn-3Al Mg alloy in simulated body fluid(SBF)was studied by immersion test,electrochemical test,and X-ray photoelectron spectroscopy(XPS).The results showed that both as-cast and extruded alloys were composed of three phases:η-Zn,α-Al,and Mg2 Zn11.The microstructure of extruded alloy was significantly refined,and the mechanical properties were much better than that of as-cast alloy.The corrosion rate of extruded alloy in simulated body fluid was 0.15～0.28 mm/a.The analysis of corrosion morphology revealed the mechanism of microgalvanic corrosion between different phases.The corrosion products included Zn/Al/Mg oxides,hydroxides,as well as phosphates and carbonates produced by the combination of Ca,P and Zn/Al/Mg.Finally,the corrosion process and mechanism of the extruded alloy were discussed based on the electrochemical test results.
Zn alloybiomaterialsmechanical propertiessimulated body fluiddegradation behavior
万方数据
维普
