采用剥落腐蚀实验、电化学阻抗测试、透射显微技术等方法,研究了不同冷轧变形量对Al-Zn-Mg-Cu合金组织和剥落腐蚀性能的影响。结果表明:随着冷轧变形量的增加,合金在EXCO溶液中剥落腐蚀增大。变形量主要通过改变晶粒形态及晶界析出相影响合金的剥落腐蚀性能。一方面冷变形导致合金晶粒纵横比增大,使得腐蚀裂纹尖端处产生的楔入应力增加,裂纹扩展速率提高;另一方面,较大冷变形合金时效时形成的连续晶界析出相易成为阳极腐蚀通道,也会加速剥落腐蚀进程。 The influence of different cold rolling deformation on the microstructure and exfoliation corrosion properties of Al-Zn-Mg-Cu alloy was studied by means of exfoliation corrosion test, electrochemical impedance test and transmission microscopy. The results show that with the increase of cold rolling deformation, the alloy exfoliation corrosion increases in EXCO solution. The amount of deformation affects the exfoliation corrosion properties of the alloy mainly by changing the grain morphology and grain boundary precipitation. On the one hand, the cold deformation leads to the increase of alloy grain aspect ratio, which leads to the increase of the wedging stress at the tip of the corrosion crack and the increase of the crack propagation rate. On the other hand, the precipitation of the continuous grain boundary formed during the aging of the larger cold- Anode corrosion channels, will also accelerate the process of peeling off corrosion.