目的 提高钛合金植入体的生物活性。方法 采用Ti6Al4V合金在0.18 mol/L的Ca(CH3COO)2?H2O- NH4H2PO4电解液体系中进行微弧氧化处理，并同时采用40 kHz和70 kHz的超声波分别对电解液进行超声振动处理。采用SEM、EDS、XRD技术分析超声辅助微弧氧化涂层的Ca/P比、相组成、表面形态和抗腐蚀性能。结果 超声处理可降低微弧氧化起弧电压，处理时间＜5 min时降低了涂层的生长速度，而处理时间＞5 min时促进了涂层的生长。超声处理促进了阳极氧化速度，增加了等离子放电通道，降低了放电微孔直径，从而提高了疏松层的密度，促使疏松层和致密层界面处产生大量孔穴，涂层发生震碎和裂纹，并且增加了微弧氧化涂层的Ca/P比，促进了金红石相的生成，但对提高涂层耐蚀性效果不明显。结论 超声处理改变了涂层成分、相含量及表面结构，且保持了涂层较好的耐蚀性，有利于提高涂层的生物活性。

The work aims to improve biological activity of titanium alloy implants. Bioactive coatings were prepared on Ti6Al4V alloy surfaces by microarc oxidation technique in electrolyte system of 0.18 mol/L Ca(CH3COO)2?H2O-NH4H2PO4, and supersonic vibration treatment was applied to the electrolyte with 40 kHz and 70 kHz ultrasound. Ca/P ratio, phase composition, surface morphology and corrosion resistance of the ultrasonic assisted microarc oxidation coatings were analyzed with SEM, EDS and XRD techniques. Striking voltage of microarc oxidation, inhibited growth rate of the coatings in the first 5 min, and accelerated the growth rate after 5 min. The ultrasonic treatment accelerated anodic oxidation rate, increased plasma discharging channels, decreased micropore diameter, and thus enhanced density of loose layer, and generated a great deal of cavities on in the interface between compact layer and loose layer, and shatters and cracks on the coatings. So, increased the Ca/P ratio. Moreover, the ultrasonic treatment promoted formation of rutile phase, and had no significant effect on enhancing corrosion resistance. Ultrasonic treatment during microarc oxidation can change microstructure, phase content and surface structure of the coatings, maintain good corrosion resistance, and makes for higher biological activity of coatings.