在含硅酸钠10g/L、六偏磷酸钠2g/L、柠檬酸钠2g/L和添加剂4 g/L的电解液中,以微弧氧化技术在Ti75钛合金的表面成功制备了微弧氧化膜.采用涡流测厚仪、扫描电镜、X射线衍射仪、显微硬度计等手段研究了微弧氧化电压和时间对钛合金微弧氧化膜厚度的影响,分析了氧化膜层的表面形貌、组成、硬度、耐蚀性能及高温性能.结果表明,微弧氧化膜层主要由金红石型和锐钛矿型二氧化钛组成.氧化电压升高,膜层厚度增加；氧化时间延长,初期膜层厚度增加明显,20 min后膜厚增加减缓.经微弧氧化处理后,钛合金的硬度、耐蚀性能和高温抗氧化性能均得到了明显改善.
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