为了研究激光冲击强化对镁合金耐腐蚀性的影响，采用电化学方法和钕玻璃脉冲激光（波长1064 nm，脉冲宽度20 ns）研究AZ31、AZ61和AZ91三种镁合金在3.5%(质量分数)NaCl溶液中的电化学腐蚀行为，并对合金表面形貌、微观组织、显微硬度、自腐蚀电位和电化学阻抗谱进行实验测试与分析。结果表明：激光冲击强化改善了镁合金的耐腐蚀性。随着激光功率密度的增加镁合金自腐蚀电位正向移动，腐蚀电流密度降低，阻抗弧变大。当功率密度为0.7 GW/cm2时电流密度开始增加，阻抗弧减小。讨论和分析了Al含量、固溶和时效处理对激光冲击镁合金自腐蚀电位和阻抗谱的影响。

In order to study the effect of laser shock processing (LSP) on the electrochemical corrosion resistance of magnesium alloys, the electrochemical corrosion behaviors in 3.5% (mass fraction) NaCl solution of AZ31, AZ61 and AZ91 magnesium alloys are investigated by electrochemical method and Ndglass laser with the wavelength of 1064 nm and pulse width of 20 ns. Its surface morphologies, microstructures, microhardness, self-corrosion potential and electrochemical impedance spectroscopy (EIS) are also examined and analyzed. The experimental results show that electrochemical corrosion resistance of magnesium alloys are improved after LSP. With the increasing of laser power density, the self-corrosion potential of magnesium alloy begins to move towards a positive direction, the corrosion current density decreases and the impedance arc becomes larger. When power density reaches to 0.7 GW/cm2, the current density increases and impedance arc becomes smaller. The effect of the Al content, solution and aging treatment on the corrosion potential and EIS of magnesium alloys by LSP are discussed and analyzed.