中文摘要：

分别以恒电压和恒电流两种方式进行TC4钛合金的微弧氧化，研究两种方式下占空比对钛合金微弧氧化膜的影响。结果表明：占空比对电流密度和电压的不同作用决定了占空比对氧化膜厚度和粗糙度的影响，恒电压方式下，增加占空比，氧化膜的生长速率增大，表面变得粗糙，而且占空比的作用比在恒电流方式下更显著，因此，在恒电压方式下通过改变占空比控制氧化膜的形成更有效。

英文摘要：

Microarc oxidation of TC4 alloy are carried out in constant voltage and current control modes respectively, and the effects of duty cycle on the formation of the microarc oxidation films on titanium alloy are investigated. The results show that different affections of duty cycle on current density and voltage determine the effects of duty cycle on the thickness and roughness of the oxide films. Under constant voltage condition, the growth rate will increase and the surface will become rougher with the increasing of duty cycle, that is more remarkable than under constant current condition. So it is more effective to control the formation of microrc oxidation films by changing duty cycle under constant voltage than under constant current conditon.