Dissolved Metal Species Mechanism for Initiation of Crevice Corrosion of Aluminum: I . Experimental Investigations in Chloride Solutions

1 May 1983

journal article
Published by The Electrochemical Society in Journal of the Electrochemical Society

Vol. 130 (5) , 1001-1007
https://doi.org/10.1149/1.2119874

Abstract

Experiments on initiation of crevice corrosion were carried out on Al specimens in dilute aqueous solutions at ambient temperature. Transient current distributions within crevices were measured by a sectioned electrode technique, and microsampling was used to monitor dissolved aluminum, pH, and [Cl⁻] composition changes within the crevice prior to breakdown. Auxiliary (noncrevice) experiments were carried out in solutions having various pH, [Cl⁻], and dissolved aluminum concentration. Initiation was found to occur upon exceeding a minimum concentration of dissolved aluminum inside the crevice. Mechanisms for initiation based on acidification within the crevice were excluded.

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