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制备了Mg-14Li-1Al(LA141),LA141-0.3Y,LA141-0.3Sr和LA141-0.3Y-0.3Sr合金,采用动电势极化曲线,恒电势电流-时间曲线,交流阻抗技术以及扫描电子显微镜等手段测试了这些合金在0.7 mol/L氯化钠溶液中的电化学性能。研究了氧化镓作为电解液添加剂对镁合金恒电势放电性能的影响。结果表明:在有与无氧化镓的情况下,合金的电化学活性和利用效率都按照以下顺序递增:LA141LA14-0.3Sr>LA141-0.3Y>LA141-0.3Y-0.3Sr。扫描电子显微镜观察发现,镁中添加Y和Sr可以阻止合金表面浓密氧化物的生成并且可以加快其在电解液中的脱落。在提高镁合金电化学性能方面,Y的作用比Sr的作用强,当Y和Sr同时添加进镁合金中,效果都将比单独添加Y和Sr的任何一种更好。LA141-0.3Y-0.3Sr表现出了最好的电化学活性和利用效率,而且合金表面的放电产物也最疏松。
Mg-14Li-1Al (LA141), LA141-0.3Y, LA141-0.3Sr and LA141-0.3Y-0.3Sr alloys were prepared by using potentiodynamic polarization curve, potentiostatic current-time curve, AC impedance technique and scanning electron Microscopy and other means to test the electrochemical performance of these alloys in 0.7 mol / L sodium chloride solution. The effects of gallium oxide as electrolyte additive on the discharge performance of magnesium alloy at constant potential were studied. The results showed that the electrochemical activity and the utilization efficiency of the alloys were increased in the following order with and without gallium oxide: LA141 LA14-0.3Sr> LA141-0.3Y> LA141-0.3Y-0.3Sr. Scanning electron microscopy showed that the addition of Y and Sr to magnesium prevented the formation of dense oxides on the surface of the alloy and accelerated the detachment in the electrolyte. Y is more effective than Sr in improving the electrochemical performance of magnesium alloys. When both Y and Sr are added to the magnesium alloy, the effect will be better than either of Y and Sr alone. LA141-0.3Y-0.3Sr showed the best electrochemical activity and utilization efficiency, and the discharge of the alloy surface is also the most loose.