高脉冲能量下ZL109铝合金微弧氧化陶瓷膜特性

Properties of micro-arc oxidation ceramic coating on ZL109 aluminum alloy surface under high pulsed energy

在硅酸钠电解液体系中对ZL109铸造铝合金进行微弧氧化试验,研究了恒压高脉冲能量条件下制得微弧氧化陶瓷膜的特性。结果表明:在使用50%占空比脉冲能量对铝合金进行微弧氧化试验时,制得的陶瓷膜厚度达200μm以上,陶瓷膜的主要成分为Al2O3,随着微弧氧化时间的延长,膜层的生长速率变慢。硅酸钠浓度为10 g/L时,膜层硬度最高,达1748 HV0.1。硅酸钠浓度为6 g/L时,得到的膜层致密性最好。

The experiment of micro-arc oxidation（ MAO） on ZL109 cast aluminum alloy was carried out in the sodium silicate electrolyte system,and the properties of ceramic coating prepared by micro-arc oxidation under constant voltage and high pulse energy were studied. The results show that using 50% duty ratio cycle pulse energy,the thickness of the ceramic coating can reach more than 200 μm,and the main component of the ceramic coating is Al2O3. With the prolonging of MAO time,the growth rate of the coating becomes slower. When the concentration of sodium silicate is 10 g/L,the hardness of the coating becomes the highest,reaching 1748 HV0. 1. When the concentration of sodium silicate is 6 g/L,the density of the coating is the best.