以甲醇和水为混合溶剂, KOH、Na2SiO3为电解质, 恒电压方式对AZ31镁合金进行等离子体电解氧化(PEO)处理, 通过原子吸收分光光度计检测等离子体电解氧化处理后电解液中镁离子含量, 研究甲醇对镁合金等离子体电解氧化过程的影响。结果表明, 在等离子体电解氧化过程中, 甲醇的加入影响镁合金PEO过程放电特性; 随着甲醇浓度的增大, 镁离子溶出量逐渐减少, 耐点滴腐蚀、耐均匀腐蚀性能均有提高; 甲醇的加入能有效降低PEO过程能耗, 当溶剂中甲醇浓度为12%(体积分数)时, 能耗比未加甲醇时降低42.9%。

The effect of methanol on the discharge characteristic of plasma electrolytic oxidation(PEO) of magnesium alloy AZ31 was investigated by constant voltage mode in electrolyte containing KOH, Na2SiO3, methanol and water. The amount of dissolved magnesium ions in the electrolyte was measured by atomic absorption spectrophotometer. The results showed that methanol had remarkable effect on the discharge characteristic of PEO of magnesium alloy. As the concentration of methanol increased, the amount of dissolved magnesium ions decreased, and the dropping corrosion resistance and uniform corrosion resistance could be enhanced considerably. Methanol reduced the energy consumption of PEO process effectively. When the concentration of methanol in the solvent was 12%, the energy consumption reduced by 42.9% than that of free of methanol.