ABSTRACT

In this study, the behaviour of the micrometric particles of the AA2198-T8 alloy during anodising at various voltages and the effect of anodising voltage on the anodised surface morphology have been investigated in a tartaric-sulfuric acid anodising solution. The results were compared with that of the AA2024-T3 alloy. For the AA2198-T8 alloy, partial dissolution of these particles occurred at 0, 3 and 4 V. Besides, for potentials above 5 V, there is a preferential dissolution of the intermetallic particles. For the AA2024-T3 alloy, the results indicated a total dissolution of the micrometric particles at 0 V and a partial dissolution at 3 V, whereas above 4 V total dissolution occurred. Between 1 and 2 V, no dissolution was observed for both alloys. The preferential dissolution of the micrometric particles resulted in defects in the anodic film and cavities on the anodised surfaces.

摘要

在这项研究中，在酒石酸-硫酸阳极氧化溶液中，研究了 AA2198-T8 合金在不同电压下阳极氧化过程中的微米颗粒行为以及阳极氧化电压对阳极氧化表面形貌的影响。结果与AA2024-T3合金的结果进行了比较。对于 AA2198-T8 合金，这些颗粒的部分溶解发生在 0、3 和 4 V。此外，对于高于 5 V 的电位，金属间化合物颗粒优先溶解。对于 AA2024-T3 合金，结果表明微米颗粒在 0 V 时完全溶解，在 3 V 时部分溶解，而在 4 V 以上发生完全溶解。在 1 和 2 V 之间，两种合金均未观察到溶解。