Two-dimensional pitting corrosion of aluminium thin layers

L. Balázs and J.-F. Gouyet

Physica A: Statistical Mechanics and its Applications, 1995, vol. 217, issue 3, 319-338

Abstract: The influence of Cl− and Fe3+ ions on the morphology of pits grown in aluminium thin films was investigated. Under open circuit conditions various morphologies ranging from percolation-cluster-like patterns to dense holes with smooth perimeters were observed. Temporal fluctuations in the free corrosion potential did not reflect significant differences in pit shapes. The growth of two-dimensional pits is likely to be influenced by two main factors: (a) local fluctuation in the electrolyte aggressiveness due to copious hydrogen bubbling at dissolution sites; (b) global restriction of pit growth imposed by the cathodic reactions occurring on the oxidised surface. A spreading percolation model with feed-back is able to reproduce all the morphologies observed and provides a possible explanation to the 1/f2 character of the potential noise.

Date: 1995
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:217:y:1995:i:3:p:319-338

DOI: 10.1016/0378-4371(95)00048-C

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