Abstract
High purity aluminium is studied in aqueous sodium acetate solution of various pH values, using the potential step method. The current-time curves resulting from the steps are extrapolated to zero time. When these extrapolated values are plotted against the potential, Tafel lines are found both in anodic and cathodic directions. The intersection of the lines are displaced in cathodic direction, indicating that at least two cathodic reactions are taking place. The Tafel slopes were not constant, but changed with changing stabilization potential, pH and stabilization time. An explanation of the results is given, based on a change in the ionic and electronic behaviour of the oxide film formed on the aluminium surface.
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