Abstract
This paper describes the results of a study concerning the influence of cold working upon the corrosion behaviour of an AISI 304L in HCl 0.1 M at room temperature. Potentiostatic tests, with test times of ≥ 150 h, followed by SEM observations, revealed that even though cold working lowers the critical pitting potential, it does not impair the susceptibility to localized corrosion. Evidence is provided for (1) pitting activity below the primary passivation potential, and (2) preferential attack on either the austenitic matrix or the martensitic phase, depending upon the corrosion potential below the protection field. It can be hypothesized that the above-mentioned behaviour is a consequence of the formation of corrosion products favoured by the presence of two metallic phases. Such products have inhibiting properties which determine pitting corrosion below the primary passivation potential and, in addition, they hinder the formation of passivity films and facilitate their local destruction.
Published Version
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