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利用自制多功能微弧氧化电源,在保持双极性电压脉冲幅度不变的条件下,研究了阴极电压脉冲占空比(dc)对钛合金微弧氧化膜特性的影响.结果表明:阴、阳极的峰值电流随处理时间的变化分为几个不同阶段,各阶段的开始和结束时间与dc密切相关.氧化膜主要由金红石和锐钛矿相TiO2组成,金红石相TiO2的相对含量在dc=50%附近随dc的增加而迅速增加.氧化膜的厚度、形貌及显微硬度也随dc的增加变化较大,当dc=50%时,制备的氧化膜显微硬度最低(4.96 GPa),而dc=70%制备的氧化膜显微硬度最高(6.1 GPa).综合来看,当65%≤dc≤80%时制备的钛合金MAO膜的成膜速率和品质较高.
The effect of the duty cycle of the cathode voltage pulse on the micro-arc oxidation film of titanium alloy was studied by using a self-made multi-functional micro-arc oxidation power supply under the condition of keeping the amplitude of the bipolar voltage pulse unchanged. The results showed that: The anodic peak current with the treatment time is divided into several different stages, the start and end time of each stage is closely related with dc oxide film is mainly composed of rutile and anatase phase TiO2, the relative content of rutile TiO2 = 50%, increases rapidly with the increase of dc.The thickness, morphology and microhardness of the oxide film also vary greatly with the increase of dc. When dc = 50%, the microhardness of the oxide film prepared is the lowest (4.96 GPa ), While dc = 70% had the highest microhardness (6.1 GPa) .Taken together, the film formation rate and quality of MAO films prepared with 65% ≤dc≤80% were high.