Localized Corrosion on Slip Steps of Aluminum Straining

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Abstract
The initial steps of localized corrosion of aluminum strained in aggressive solutions were studied by electron microscopy of oxide replicas. Aluminum samples were strained at a constant potential in the following deaerated solutions: ; ; and . No pitting was found on the aluminum strained in those solutions below the pitting potential; the slip bands showed the same substructure as that found on aluminum strained in air. At, and above, the pitting potential, pitting was found on the surface of the strained aluminum. Pitting nucleated on the whole surface in neutral solutions. In solution (pH 11) and in solution pitting nucleated preferentially on the slip bands, leading to semicylindrical pits. It was also concluded that mechanical film breakdown is not a sufficient condition for pit initiation. Another process, such as localized acidification, must be assumed to explain pit initiation at pitting potential.

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