AZ31镁合金表面钼酸盐化学转化膜耐腐蚀性能

Corrosion Resistance of Molybdate Chemical Conversion Coating on AZ31 Magnesium Alloy

以AZ31镁合金作为基体,钼酸钠、氟化钠作为主要转化液体系,研究不同的钼酸钠浓度、反应的温度、时间等工艺参数对于转化膜性能的影响。试验表明AZ31镁合金钼酸盐化学转化膜的最佳工艺参数:Na_(2)MoO_(4)·2H_(2)O为10g·L^(-1),反应时间20min,反应温度50℃;钼酸盐转化膜的耐腐蚀性能大于基体的耐腐蚀性能,且耐腐蚀性能有很大的提升。

Using AZ31 magnesium alloy as the matrix and sodium molybdate and sodium fluoride as the main conversion liquid system,the effects of different sodium molybdate concentration,reaction temperature,time and other process parameters on the performance of the conversion film were studied.Experiments show that the optimal process parameters of the molybdate chemical conversion coating on AZ31 magnesium alloy are:Na_(2)MoO_(4)·2H_(2)O is 10g·L^(-1),the reaction time is 20min,and the reaction temperature is 50℃;the corrosion resistance of the molybdate conversion coating is greater than that of the substrate.performance,and corrosion resistance has been greatly improved.