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

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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.

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Publisher

Journal of The Electrochemical Society

Notes

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

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http://hdl.handle.net/1961/auislandora:84369

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