Ding Ziyu, Yuan Qianhong, Wang Hao, Tang Yinghong, Tan Yimin, He Quanguo
School of Packaging and Materials Engineering, Hunan University of Technology Zhuzhou 412007 China
School of Mechanical Engineering, Hunan University of Technology Zhuzhou 412007 China.
RSC Adv. 2022 Oct 7;12(43):28196-28206. doi: 10.1039/d2ra04907d. eCollection 2022 Sep 28.
Magnesium alloys are attracting increasing attention for the fabrication of temporary implants because of their superior biodegradability and biocompatibility. However, their high degradation rate under physiological conditions limits their clinical applications. In this work, a NbO/NbO-Mg/Mg multilayer coating was prepared on the surface of AZ31 magnesium alloy by magnetron sputtering in order to improve its corrosion resistance. The microstructure and performance of the layers were studied by SEM, AFM, EDS, and XPS, and a scratch tester, nanoindenter, friction tester, and electrochemical workstation, using NbO monolayer coating as a control. The results show that these two coatings significantly improved the mechanical, tribological, and anticorrosion performance of AZ31 magnesium alloy. Compared with a NbO monolayer coating, the multilayer coating exhibits an increased adhesion by about 10.6 times, and a decreased wear rate and corrosion current density by one order of magnitude, meaning higher damage resistance. This study provides a feasible strategy for enhancing the properties of ceramic layers on magnesium alloys for medical applications.
镁合金因其优异的生物降解性和生物相容性，在临时植入物制造方面正吸引着越来越多的关注。然而，它们在生理条件下的高降解速率限制了其临床应用。在这项工作中，通过磁控溅射在AZ31镁合金表面制备了NbO/NbO-Mg/Mg多层涂层，以提高其耐腐蚀性。以NbO单层涂层作为对照，利用扫描电子显微镜（SEM）、原子力显微镜（AFM）、能谱仪（EDS）和X射线光电子能谱仪（XPS）以及划痕测试仪、纳米压痕仪、摩擦测试仪和电化学工作站对各层的微观结构和性能进行了研究。结果表明，这两种涂层显著改善了AZ31镁合金的力学、摩擦学和耐腐蚀性能。与NbO单层涂层相比，多层涂层的附着力提高了约10.6倍，磨损率和腐蚀电流密度降低了一个数量级，意味着具有更高的抗损伤能力。本研究为增强用于医疗应用的镁合金陶瓷层性能提供了一种可行的策略。
