A simple theory for the concentration and potential variation in a crevice is compared with experimental results from a model crevice. A consequence of the theory, confirmed by experiments, is that a small potential difference in a crevice can cause a large concentration change and a corresponding large increase in corrosion current at a given applied potential. The theory gives a simple way to estimate concentrations in crevices in real corrosion situations.
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Vermilyea et al. (1970) studied this question.