中文摘要：

用静态失重法、动电位极化曲线和电化学交流阻抗谱等方法研究了Mg-11Li-3Al-0.5RE合金在碱性NaCl溶液中的腐蚀行为,结果表明：在碱性NaCl溶液中,随着Cl^-浓度的升高,合金的平均腐蚀速率增大,腐蚀电流增大,体系中Rsol、Rt、Rf减小,腐蚀严重;当溶液的碱性增强时,合金的点蚀电位正移,表面膜钝化作用增强,Rf提高,同时Rt和Rsol增大,减缓了腐蚀的进行;在合金表面生成的腐蚀产物主要成分为Mg（OH）2、Al2O3和Li2O2;Mg-11Li-3Al-0.5RE合金的腐蚀以点蚀为主,逐渐向基体内部和四周扩大,形成较深的蚀坑.

英文摘要：

The dependence effects of corrosion behavior of Mg-11Li-3Al-0.5RE alloy on Cl^- concentration of alkaline NaCI solution were investigated by means of weight loss, potentiodynamic polarization and impedance spectroscopy. XRD and SEM technologies were used to analyze the corrosion products and appearance of the alloy surfaces. The results showed that increasing Cl^- concentration could result in an increase of average corrosion rate and corrosion current and a decrease of Rsol, Rt, Rf. This suggested that corrosion developed more seriously with the increase of Cl^- concentration. The increase of pH was observed to lead to an increase of pitting corrosion potential as well as Rf, Rt and Rsol, demonstrating an improvement of passivation film formed on the alloy surface so that the corrosion rate was slowed down. The corrosion products on alloys surface mainly consisted of Mg（[OH）2, Al2O3 and Li2O2. The main corrosion mode of the alloy was pitting corrosion, the deep corrosion pits were formed because the corrosion pits expanded towards the matrix inner and enlarged all around.