通过对腐蚀析氢行为、开路电位、动电位极化曲线、交流阻抗谱和恒流放电性能等的测试与分析，研究了AZ31镁合金在不同浓度Al（NO₃）₃溶液中的电化学行为和放电性能。结果表明：随着Al（NO₃）₃溶液浓度的增大，AZ31镁合金的开路电位和自腐蚀电位负移，交流阻抗值减小，放电活性增强；与镁盐电解液相比，AZ31镁合金在0.6 mol·L^-1 Al（NO₃）₃溶液中的恒流放电电压较高、放电曲线平稳、放电效率高、放电容量大；放电过程中AZ31镁合金电极表面生成2Mg（OH）₂·Al（OH）₃，促进Mg（OH）₂从电极表面脱落，有利于电解液与电极表面充分接触，使AZ31镁合金电极具有较高的放电活性与放电稳定性。

The electrochemical behavior and discharge performance of AZ31 magnesium alloy in different concentration of Al(NO₃)₃ solution were investigated by the testing and analysis of hydrogen evolution, open circuit potential, potentiodynamic polarization curve, alternating current impedance and constant-current discharge performance. The results indicate that with the increase of concentration of Al(NO₃)₃ solution, the open circuit potential and the free corrosion potential shifted negatively, the alternating current impedance decreased and the electrochemical activity enhanced. Compared with magnesium salt solutions, AZ31 magnesium alloy had higher constant current discharge voltage, more stable discharge curve, higher discharge efficiency and larger discharge capacity in 0.6 mol·L^-1 Al(NO₃)₃ solution. 2Mg(OH)₂·Al(OH)₃ was generated on the surface of the AZ31 magnesium alloy electrode in the progress of discharge which promoted the Mg(OH)₂ to fall off from electrode surface easily and helped the electrolyte contact with the electrode surface. The AZ31 magnesium alloy electrode had high discharge activity and discharge stability.