What is localised corrosion?

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 –

• Pitting on a boldly exposed surface
• Corrosion in a creviced region shielded from the bulk environment
• Intergranular corrosion of an alloy with a susceptible grain boundary region
• Exfoliation corrosion, which is a form of intergranular corrosion which involves prying apart of elongated grains by a voluminous grain boundary corrosion product.

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