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The chemical nature of Aluminum corrosion : V. Energy transfer in Aluminum dissolution

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journal contribution
posted on 2023-08-05, 12:00 authored by R.T. Foley, T.H. Nguyen

The transfer of energy during the dissolution of aluminum is represented by a potential energy surface. In chloride solution, the high energy aluminum metal ionizes rapidly to the Al+++ ion which also hydrolyzes rapidly. At the start of the reaction, in the microsecond range, there are two species available for reaction, Al+++ and . The reaction follows two alternative paths; the energy levels of the alternative species, and have been measured. These two species react further to form a reasonable stable basic aluminum chloride that is transformed slowly to and finally to . The energy levels of these species have been measured. Reaction in sulfate solution differs because the intermediate species, and occupy low energy levels, and the basic aluminum sulfate has a lower energy than . In most practical cases of aluminum corrosion, the reaction proceeds in the reverse direction. The reactants are the oxide‐covered aluminum surface and the anion combining to form the basic aluminum salt.



Journal of The Electrochemical Society


Published in: J. Electrochem. Soc., Vol. 129, No.3, pp.464-467.


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