电参数对7075铝合金微弧氧化膜层粗糙度的影响

Effect of Electrical Parameters on Roughness of Micro-Arc Oxidation Film of 7075 Aluminum Alloy

摘要: 本文在微小极间距条件下对7075铝合金进行了微弧氧化实验。比较了正向电压、占空比和脉冲频率等电参数对铝合金微弧氧化膜层粗糙度的影响。通过正交试验，总结出单一电参数水平因素下膜层粗糙度的变化规律，正向电压的增大，反向占空比减小，脉冲频率减小，都会促使膜层粗糙度增大。通过相对极差分析发现，反向占空比对微弧氧化膜粗糙度影响程度最大，其次是极间正向电压，脉冲频率影响最小。针对7075铝合金微弧氧化处理造成的粗糙度增大的问题，应重点考虑增大电源的反向占空比。

Abstract: In this paper, the micro arc oxidation experiment of 7075 aluminum alloy was carried out under the condition of micro electrode spacing. The effects of forward voltage, duty cycle and pulse frequency on the roughness of aluminum alloy micro arc oxidation film were compared. Through orthogonal test, the variation law of film roughness under single electrical parameter level factor is summarized. The increase of forward voltage, the decrease of reverse duty cycle and pulse frequency will increase the roughness of the film. Through the relative range analysis, it is found that the reverse duty cycle has the greatest influence on the roughness of micro arc oxide film, followed by the forward voltage between electrodes, and the pulse frequency has the least influence. In view of the increase of roughness caused by micro arc oxidation of 7075 aluminum alloy, we should focus on increasing the reverse duty cycle of the power supply.