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Pitting corrosion is localized corrosion by which local cavities, pits, are formed on a seemingly initially smooth metal surface. A pit may be initiated due to small surface defects, such as inhomogeneities in composition or shape, or from mechanical abuse.

How and if the pit grows depends on its shape and type of metal together with on a number of electrolyte factors such as salinity, pH, and temperature. Understanding the pitting process is paramount for proper material selection in corrosive environments.

This tutorial investigates the fundamental mechanisms of pit propagation by simulating electrode kinetics, mass transfer, and the resulting geometry deformation in a common type of stainless steel.