As the name suggests, localised corrosion occurs in specific locations rather than across the entire exposed surface. This could be due to more aggressive conditions existing in a specific location (crevice corrosion) or where there are defects or damage to the protective passive film layer. These forms of localised corrosion can combine, for instance pits forming within a crevice which then lead to an acceleration of the corrosion mechanism.
Common forms of localised corrosion include –
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