目的 在钛合金表面制备高硬度、高耐磨的微弧氧化膜，并研究其摩擦磨损性能。方法 采用较高浓度的铝酸盐电解液在钛合金表面制备了微弧氧化膜，通过扫描电子显微镜（SEM）、X射线能量色散谱仪（EDS）和X射线衍射仪（XRD），对膜层的微观形貌和组成进行表征。采用辉光放电光谱仪（GDOES）分析膜层厚度方向的元素变化情况。利用显微硬度计测试膜层硬度，利用摩擦试验机测试膜层的摩擦磨损性能，并通过三维轮廓仪分析磨痕轮廓。结果 膜层主要由Al2TiO5和γ-Al2O3相构成，有少量的金红石型TiO2相；随着铝酸盐浓度的增大，微弧氧化膜的表面形貌和元素分布更均匀、一致，内部的孔隙和微裂纹更少。膜层硬度较Ti6Al4V基材有大幅提升，且随铝酸盐浓度的增大而升高，最高可达1140HV。膜层在稳定摩擦阶段的摩擦系数介于0.55~0.65之间，随着铝酸盐浓度的升高，磨痕深度减小且磨损率降低。结论 高浓度铝酸盐电解液中制备的微弧氧化膜具有较高的硬度，在滑动干摩擦条件下表现出优异的耐磨性。

The work aims to fabricate MAO coatings with high hardness and wear resistance on Ti alloy and study the friction and wear properties. MAO coatings were prepared on Ti alloy with aluminate electrolyte in higher concentration. The mi-crostructure and composition of the coatings were characterized by Scanning Electron Microscope (SEM), X-ray Energy Dis-persive Spectrometer (EDS) and X-ray Diffraction Spectrometer (XRD). The cross-sectional elements distribution was investigated via Glow Discharge Spectrometer (GDOES). The micro-hardness and wear resistance were measured with Vicker shardness tester and friction tester, respectively. The wear scars were analyzed with 3D surface profiler. The coatings were mainly composed of Al2TiO5 and γ-Al2O3 phases, with a little of rutile TiO2. As the aluminate concentration increased, the coatings exhibited more uniform surface morphologies and elements distribution, and less internal pores and micro-cracks. The hardness of the coatings was increased with the increase of the aluminate concentration, and the maximum hardness was up to ~1140HV, which was significantly higher than that of the Ti6Al4V substrate. The friction coefficients of the coatings were between 0.55 and 0.65 in stable friction stage. As the aluminate concentration increased, the wear scar depth reduced and the wear rate decreased. MAO coatings prepared in relative higher concentrated aluminate electrolyte has higher hardness and shows excellent wear resistance under the dry sliding condition.