(北京化工大学 材料科学与工程学院，北京 100029)
摘 要: 用电化学方法和扫描电子显微镜研究氧化时间、硫酸浓度、氧化电流密度等氧化工艺参数对ZL201铝合金阳极氧化膜受热开裂行为的影响，并分析讨论氧化膜中内应力的产生机理。结果表明：氧化膜封闭后存在少量缺陷，加热时会沿缺陷形成开裂并产生新裂纹。随氧化时间延长，氧化膜受热后裂纹数量增多；随硫酸浓度增大，氧化膜受热后裂纹密度增大；而随着氧化电流密度的增大，氧化膜受热后裂纹密度减小。
关键字: 阳极氧化膜；耐热性；裂纹；内应力
（School of Materials of Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China）
Abstract: The effects of oxidation time, sulfuric acid concentration and current density on heat-resistance of anodic film formed on ZL201 aluminium alloy were studied by scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS). The generation of residual stress was also discussed. The results show that there exists a few cracks in sealed anodic oxidation films. When the films are heated, the initial cracks become larger and some new cracks occur. The longer the anodic oxidation is, the more the cracks in the films after heating. The higher density of cracks in anodic films, which are anodized in higher concentration of sulfuric acid solutions, can also be found after heating. On the contrary, with the increase of oxidation current density, the density of cracks in anodic films after heating decreases.
Key words: anodic oxide film; heat-resistance; crack; internal stress
