Al and aluminum alloys are widely used in the transportation industry and aerospace field owing to their low density. They are always utilized as the sheathing materials, whose corrosion resistances need special attention. In the study, the electrochemical impedance spectroscopy (EIS) measurements and potentiodynamic polarization tests are performed on pure Al, aluminum alloys 2A97, 6061, 7050 and 2024. The corrosion behaviors of the five materials are respectively characterized by the resultant indicators, such as the corrosion potential E _c , the corrosion current density I _c , the corroded surface morphology and the frequency characteristics. The materials sequences that determined respectively by these indicators are compared with each other. The conflicts among these sequences are found. Then potentiostatic polarization measurements are carried out on the five materials. The instantaneous characteristic of the corrosion potential and polarization current density of each material during its corrosion process is revealed. Because of the characteristic, it is concluded that the potentiostatic polarization measurement and resultant polarization current density are more suitable to characterize the corrosion behaviors of Al and aluminum alloys. The investigation could provide help in the exploitation of new aluminum alloys with the better corrosion property.

铝和铝合金由于其密度低而被广泛应用于交通运输业和航空航天领域。它们一直被用作护套材料，其耐腐蚀性需要特别注意。在研究中，对纯铝、铝合金 2A97、6061、7050 和 2024 进行了电化学阻抗谱 (EIS) 测量和动电位极化测试。这五种材料的腐蚀行为分别通过所得指标表征，如腐蚀电位E _c，腐蚀电流密度I _c ，腐蚀表面形态和频率特性。将这些指标分别确定的物料顺序进行比较。发现这些序列之间的冲突。然后对五种材料进行恒电位极化测量。揭示了每种材料在其腐蚀过程中的腐蚀电位和极化电流密度的瞬时特性。由于该特性，可以得出结论，恒电位极化测量和由此产生的极化电流密度更适合表征铝和铝合金的腐蚀行为。该研究可为开发具有更好腐蚀性能的新型铝合金提供帮助。