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Forms of Corrosion

The most common type of localized corrosion is pitting, in which small volumes of metal are removed by corrosion from concentrated areas on the surface to produce craters or pits. Penetration rates from pitting may exceed 10 times the rates associated with uniform corrosion. Pitting corrosion may occur on a metal surface in a stagnant or slow-moving liquid. Pitting also may result from crevice corrosion, poultice corrosion, deposition corrosion, cavitation, impingement, and fretting corrosion