镁合金表面水热一步法制备生物膜层及其表征

摘要

Magnesium alloy is potentially a desirable metallic material for degradable orthopedic implants if its corrosion rate can be reduced by surface modification. To achieve this aim, a protective and biocompatible coat- ing was directly prepared on AZ91D magnesium alloy surface by the low-cost and simple one-step hydrothermal （HT） strategy in composition-simple sodium carbonate（SC）solution in this paper for the first time. Phase structures, surface morphologies and corrosion resistant properties of the coating were identified by X-ray dif- fraction （XRD）, scanning electron microscopy （SEM）, electrochemical measuring and long-term immersion pH test in c-SBF, respectively. This paper provides references on a new surface modification method of magnesium alloy implants.%针对镁合金作为生物体植入材料，因其活性高易腐蚀问题，对其做表面改性研究。提出了一种相对简易、低成本的方法——水热一步法，在低成本的Na2CO3处理液中，直接在AZ91D镁合金上制备了具有相应保护性能及生物相容性膜层。采用XRD、SEM表征膜层的结构及微观形貌，结合电化学手段及腐蚀浸泡实验测试膜层在模拟体液中的耐蚀性能。研究结果将为镁合金应用于生物体植入材料的表面改性提供一条新途径。