Molybdenum-induced Microstructural Changes and Associated Corrosion Resistance of Biodegradable Mg-Zn Alloy
In this paper,a trace amount of Mo element was added to the Mg-Zn alloy,and the Mg-2Zn-0.3Mo alloy was prepared by the metal mold casting method.The microstruc-ture and corrosion behavior of as-cast Mg-2Zn and Mg-2Zn-0.3Mo alloys were investigated systematically.The microstructures of the as-cast Mg-2Zn and Mg-2Zn-0.3Mo alloys were analyzed by optical microscopy(OM),scanning electron microscopy(SEM),X-ray diffrac-tion analysis(XRD),and energy-dispersive spectrum(EDS).The corrosion resistance was studied by electrochemical test and immersion test in Hank's solution(simulated human body fluids).The results showed that the as-cast Mg-2Zn-0.3Mo alloys consisted of an α-Mg matrix and a small amount of MgZn phase and MoZn22 phase.Compared with the Mg-2Zn al-loy,the grains were refined(100-130 μm to 60-80 μm).The corrosion current of the Mg-2Zn alloy decreased by 89.23 μA·cm-2,and the corrosion rate decreased by 37.93％with 0.3％Mo addition,respectively.The addition of Mo effectively improves the corrosion re-sistance of the Mg-Zn alloy.Therefore,the results can provide theoretical and data support for the subsequent development of Mg-Zn-Mo alloys for biodegradable implants.
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