Abstract
The effect of some anions on the growth of the oxide film on aluminium was studied in acid and neutral media, as well as the effect of pH in presence of the same anion. In all the cases studied an inner barrier layer is formed adjacent to the metal and is covered on top with a porous layer. This latter outer layer differentiates into two regions, the one adjacent to the solution being characterized by a more open structure and a higher degree of anion incorporation as compared to the region embedded between it and the inner barrier layer. The rate of dissolution of the barrier layer is not affected by pH or anion type prevailing in the formation medium, since this layer is formed of pure alumina. The dissolution of the outer porous layer, on the other hand, is affected by both pH and anion type.
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Mazhar, A.A., Ei-Taib Heakal, F. & Awad, K.M. Medium effect on electrochemical behaviour of anodized aluminium. J Mater Sci 26, 3707–3711 (1991). https://doi.org/10.1007/BF01184960
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DOI: https://doi.org/10.1007/BF01184960