通过干湿周浸加速实验方法、扫描电镜观察和电化学阻抗谱测试技术,研究了2A12铝合金的初期腐蚀规律与电化学行为.实验结果表明,干湿周浸48h后,所有Cl-溶液中试样都发生了明显的点蚀.提高Cl-含量可以促进点蚀的形成和发展,同时腐蚀产物增多.当Cl-含量低时,腐蚀过程主要受电荷转移电阻控制;随Cl-含量增加,其电化学特征转变为受电荷转移电阻和Warburg阻抗扩散混合控制. The initial corrosion and electrochemical behavior of 2A12 aluminum alloy were studied by means of wet-dry immersion accelerated test, scanning electron microscopy and electrochemical impedance spectroscopy (EIS). The experimental results showed that after 48h wet-wet immersion, The obvious pitting corrosion occurred in the samples.The increase of Cl- content could promote the formation and development of pitting corrosion and the increase of corrosion products.When the Cl- content was low, the corrosion process was mainly controlled by the charge transfer resistance.With the increase of Cl- content, Its electrochemical characterization is controlled by charge-transfer resistance and Warburg impedance diffusion mixing.