目的 改善AZ31镁合金的耐腐蚀性能及生物活性。方法 使用微弧氧化技术，分别在以六偏磷酸钠为主盐的电解液和以六偏磷酸钠为主盐、以纳米羟基磷灰石（HA）为添加剂的电解液中，在AZ31镁合金表面制备了微弧氧化涂层。通过扫描电子显微镜（SEM）、能谱仪（EDS）和X射线衍射仪（XRD）表征了涂层的微观形貌、元素特征和相组成。通过电化学方法和浸泡实验考察了涂层的耐蚀性。通过细胞实验评价了两种涂层的细胞相容性。结果 电解液中的HA可以进入到微弧氧化涂层中，含HA的微弧氧化涂层较不含HA的更致密，且有封孔现象。电化学方法及浸泡实验结果表明，含HA的微弧氧化涂层的耐腐蚀性能更好。细胞表面粘附实验和细胞增殖实验也表明，经表面纳米HA微弧氧化处理后的AZ31镁合金生物相容性更好，且对MC3T3-E1细胞的增殖有促进作用。结论 六偏磷酸钠电解液中添加纳米HA，可以在AZ31镁合金表面制备出含HA的微弧氧化涂层，且其耐腐蚀性能和生物活性均优于不含HA的微弧氧化膜。

The work aims to improve corrosion resistance and bioactivity of AZ31 magnesium alloy. Micro-arc oxidation films were prepared on the surface of AZ31 magnesium alloy in one piece of electrolyte taking sodium hexametaphosphate as main salt, and the other taking sodium hexametaphosphate as main salt and nano-hydroxyapatite (HA) as additive. Microstructure, element characteristics and phase composition of the coatings were characterized with scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and X-ray diffractometer (XRD). Corrosion resistance of the coatings was investigated in electrochemical method and by performing immersion experiment. Cell compatibility of the two coatings was evaluated by cell experiment. HA in the electrolyte could enter into the micro-arc oxidation film. Compared with the HA-free micro-arc oxidation film, the micro-arc oxidation film containing HA was more compact and was subject to hole sealing. Electrochemical method and soak test showed that HA-MAO exhibited better corrosion resistance. Cell surface adhesion experiment and cell proliferation experiment showed that AZ31 magnesium alloy receiving HA micro-arc oxidation not only had better biocompatibility, but also promoted proliferation of MC3T3-E1 cells. Addition of nano-HA in the sodium hexametaphosphate solution can produce HA-containing micro-arc oxidation coating on the surface of AZ31 magnesium alloy, and its corrosion resistance and bioactivity are superior to those of HA-free micro-arc oxidation coating.