摘要
作为一种新型可降解医用金属材料, Mg–Zn合金已被广泛应用于临床中。然而其在生物体液环境中较差的腐蚀性能严重制约了其推广和使用。本文将一种人体必需元素——Sn元素添加到Mg–Zn合金中, 制备了Mg–2Zn–3Sn三元系合金, 提高了镁合金的耐蚀性和力学性能。本文系统地研究了铸态Mg–2Zn和Mg–2Zn–3Sn合金的微观组织和腐蚀性能, 为将来应用于生物可降解植入物做准备。采用光学电镜(LM)、扫描电镜(SEM)、X射线衍射(XRD)和能谱(EDS)分析了铸态Mg–2Zn和Mg–2Zn– 3Sn合金的微观组织。同时, 对Mg–2Zn和Mg–2Zn– 3sn合金进行了电化学测试和Hank’s溶液(模拟人体体液)浸泡测试。结果表明:铸态Mg–2Zn–3Sn合金由α–Mg基体和Mg2Sn相组成。与Mg–2Zn合金相比, Mg–2Zn– 3Sn合金中第二相数量明显增加, 晶粒细化(100–130 μm 到 50–70 μm)。电化学试验和Hank’s溶液浸泡试验结果表明, 添加3 wt% Sn时Mg–2Zn合金的腐蚀电流降低了114.51 μA·cm−2, 腐蚀速率降低了54.3%。Sn的加入有效地提高了Mg–2Zn合金的耐蚀性。此外, 还探讨了Sn对Mg–2Zn合金腐蚀性能的改善机理。研究结果可为后续开发可降解的Mg–Zn–Sn合金提供理论和数据支持。
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (No. 51472133) and Shandong Natural Science Funds (No. ZR2020ME009)
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Gao, Y., Zhao, P., Cao, XQ. et al. Tin-induced microstructural changes and associated corrosion resistance of biodegradable Mg–Zn alloy. Rare Met. 41, 883–888 (2022). https://doi.org/10.1007/s12598-021-01823-z
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DOI: https://doi.org/10.1007/s12598-021-01823-z