通过“变形+热处理”的方法改变Al-Zn-Sn-Ga合金的晶粒度,利用电流效率、极化曲线、电化学阻抗谱和微观分析手段,研究了晶粒度对其电化学性能的影响.结果显示,经“不同变形量+相同热处理”的合金试样,阳极电流效率随晶粒尺寸增加先升高后降低,晶粒尺寸约为38μm时电流效率最高;而经“相同变形量+不同热处理”的试样,晶粒尺寸越小,阳极的电流效率越高.晶粒大小对阳极表面溶解状态没有明显的影响. The grain size of Al-Zn-Sn-Ga alloy was changed by the method of “deformation + heat treatment”. The effects of grain size on the electrochemical properties of Al-Zn-Sn-Ga alloy were studied by means of current efficiency, polarization curve, electrochemical impedance spectroscopy and micro- The results show that the anode current efficiency increases first and then decreases with the increase of grain size, and the current efficiency is the highest when the grain size is about 38μm. Sample with the same deformation + different heat treatment, the smaller the grain size, the higher the current efficiency of the anode.The grain size has no obvious effect on the dissolution state of the anode surface.