Glass-forming ability and corrosion performance of Mn-doped Mg–Zn–Ca amorphous alloys for biomedical applications
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In the present work, ribbon and 2-mm rod samples of Mg–Zn–Ca–Mn alloys were prepared by melt-spinning and copper mold injection methods, respectively. Effects of Mn doping on glass-forming ability and corrosion performance in simulated body fluid of Mg65Zn30Ca5 alloy were studied through X-ray diffraction, scanning electron microscopy, differential scanning calorimeter, and electrochemical and immersion tests. Results show that with the Mn addition increasing, all the ribbon samples are completely in amorphous state. However, the microstructure of 2-mm rod samples transfers from fully amorphous for the Mn-free alloy to almost polycrystalline state with precipitated Mg, Mn, and MgZn phases. Glass-forming ability of Mg65Zn30Ca5 alloy is decreased by Mn addition. Results of electrochemical and immersion tests demonstrate that the Mn-doped samples exhibit more negative corrosion potential and larger corrosion current density, suggesting that the corrosion resistance decreases with doping amount of Mn element increasing.
KeywordsMg–Zn–Ca amorphous alloys Mn doping Glass-forming ability Corrosion performance
This study was financially supported by the National Natural Science Foundation of China (Nos. 51201120 and 51401155), the Science & Technology Coordination & Innovation Project of Shaanxi Province (No. 2016KTZDGY-04-01) and the Key Laboratory Program Funded by Shaanxi Provincial Education Department (No. 17JS053).
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