Tang Hui, Tao Wei, Wang Chao, Yu Huilong
School of Materials and Energy, University of Electronic Science and Technology of China Chengdu 611731 China
Shanxi Key Laboratory of Advanced Magnesium-Based Materials, Taiyuan University of Technology Taiyuan 030024 P. R. China.
RSC Adv. 2018 Apr 3;8(22):12368-12375. doi: 10.1039/c7ra10951b. eCollection 2018 Mar 26.
Magnesium (Mg) alloys, can potentially be used as biodegradable orthopedic implants because of their biodegradability and good mechanical properties. However, a quick degradation rate and low bioactivity have prevented their clinical application. In order to enhance the corrosion resistance and the bioactivity of Mg alloys, protective composite coatings were prepared on AZ31 magnesium alloy followed by sol-gel sealing treatment under low-pressure conditions. The morphologies, crystalline structure and the composition of the samples were characterized by SEM, XRD, and XPS. Electrochemical corrosion test and the bioactivity were also studied. The results indicated that the composite coatings not only improved the corrosion resistance, but also enhanced the bioactivity of AZ31 Mg alloy. Therefore, Mg alloy treated with micro-arc oxidation and sol-gel offers a promising approach for biodegradable bone implants.
镁（Mg）合金因其生物可降解性和良好的机械性能，有潜力用作可生物降解的骨科植入物。然而，快速的降解速率和较低的生物活性阻碍了它们的临床应用。为了提高镁合金的耐腐蚀性和生物活性，在AZ31镁合金上制备了保护性复合涂层，然后在低压条件下进行溶胶 - 凝胶密封处理。通过扫描电子显微镜（SEM）、X射线衍射（XRD）和X射线光电子能谱（XPS）对样品的形貌、晶体结构和成分进行了表征。还研究了电化学腐蚀试验和生物活性。结果表明，复合涂层不仅提高了AZ31镁合金的耐腐蚀性，还增强了其生物活性。因此，经微弧氧化和溶胶 - 凝胶处理的镁合金为可生物降解骨植入物提供了一种有前景的方法。
