目的 在可降解镁合金表面制备缓蚀剂覆载的微弧氧化/聚乳酸-羟基乙酸(PLGA)复合涂层，提高其耐蚀性。方法 首先利用微弧氧化技术在镁合金表面制备出适合复合缓蚀剂涂层的微弧氧化(Micro-Arc Oxidation，MAO)涂层，之后在微弧氧化多孔涂层上浸涂PLGA-缓蚀剂涂层，得到复合涂层，缓蚀剂选择天然植物提取物姜黄素(Curcumin，Cur)。利用SEM&EDS、FTIR和AFM等实验对涂层形貌、成分及结构进行分析，通过电化学测试、体外浸泡实验评价涂层的耐蚀性能。结果 FTIR结果表明Cur可成功覆载在涂层中，且不与PLGA发生反应。电化学测试和体外浸泡实验表明MAO/PLGA-Cur涂层能有效提高镁合金的耐蚀性。动电位极化曲线显示MAO/PLGA-Cur涂覆样品的腐蚀电流密度比基体下降了3个数量级，浸泡14 d的质量损失比基体下降62.04%，比未覆载的样品减少26.63%。结论MAO时间为10 min为最合适复合缓蚀剂涂层的参数。Cur作为缓蚀剂的最佳添加量为0.12%，PLGA的最佳添加量为12%，最佳浸涂角度为0°。

This work aims to control the degradation rate of biodegradable Mg by preparing corrosion inhibitor-loaded micro-arc oxidation/PLGA composite coating. The composite coating was prepared by means of micro-arc oxidation and dipping coating. Natural plant extract curcumin (Cur) was selected as the corrosion inhibitor. First, the MAO coating suitable for the composite corrosion inhibitor coating was prepared by the micro-arc oxidation technology, and then the PLGA-corrosion inhibitor coating was prepared on the micro-arc oxidation layer by the dipping coating to obtain the composite coating. SEM&EDS, AFM, and FTIR experiments were employed to analyze the microstructure and compositions of the coating. The corrosion resistance of the coating was evaluated through electrochemical tests and immersion tests in vitro. FTIR results showed that Cur was successfully loaded in the coating and did not react with PLGA. Electrochemical and immersion experiments in vitro showed the coatings effectively improve the corrosion resistance of magnesium alloy substrate. The results of potentiodynamic polarization tests turned out that the corrosion current density of MAO/PLGA-Cur coating was three orders of magnitude lower than that of the Mg substrate. The results of the immersion experiments in vitro indicated that the weight loss of the MAO/PLGA-Cur coating was reduced 62.04% and 26.63% when compared with the substrate and coating without Cur after 14 days of immersion respectively. The optimized parameter of micro-arc oxidation time was 10 min. The coating showed the best performance when the concentration of Cur was 0.12wt.%, the concentration of PLGA was 12wt.%, and the dipping coating process was 0 degrees.