镁合金微弧氧化中电源脉冲宽度的作用

Effect of Pulse Width in Micro-Arc Oxidation of Magnesium Alloy

为研究带放电回路的微弧氧化电源脉冲宽度对镁合金微弧氧化的影响,设计了频率为500 Hz条件下,占空比为20%、40%、80%时的镁合金微弧氧化实验。研究发现,随着脉冲宽度的增加,膜层表面孔洞数量减少且孔径尺寸略有增大;微弧氧化的成膜效率随着脉冲宽度的增加而增大;在占空比40%左右时成膜效率最高,且膜层质量较好。

In order to study the effects of pulse width, a pulse power supply with discharge loop is designed and an experiment on magnesium micro-arc oxidation （MAO） with a steady rate of voltage rise is conducted in this paper. The pulse frequency is constant at 500 Hz and the duty cycle is adjusted on 20% , 40% and 80%. The results show that the number of surface pores will decline while the pore size will increase slightly with the increase of pulse width; the treatment efficiency of MAO coating will improve with the increase of pulse width; and the best efficiency and higher quality of MAO coating can be ob- tained when the duty cycle is about 40%.