Abstract
This chapter describes a localized corrosion attack called pitting , which is typical of active -passive metals in oxidizing chloride-containing environments: the passive film breaks locally, then corrosion proceeds at the damaged spot, few millimetres wide or even less, creating a macrocell with the surrounding intact passive metal. The influence of metal composition and environmental parameters on corrosion , pitting and repassivation potential for stainless steel in chloride containing environments is shown. Empirical parameters such as Pitting Resistance Equivalent Number (PREN) are discussed and correlated to the likelihood of pitting occurrence. The use of Pedeferri’s diagram , a potential vs chloride content diagram, is also introduced, as a tool to assess corrosion conditions of an active passive metal in chloride-containing environments.
A thousand times better petting than pitting.
Peter Ironfoot
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Pedeferri (Deceased), P. (2018). Pitting Corrosion. In: Corrosion Science and Engineering. Engineering Materials. Springer, Cham. https://doi.org/10.1007/978-3-319-97625-9_11
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DOI: https://doi.org/10.1007/978-3-319-97625-9_11
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