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Corrosion is an electrochemical process by which metals return to their natural oxide state. Most metals used in cooling water systems will corrode to some extent, some more severely than others. The rate of general corrosion, or the rate at which metal is lost equally across the surface, is normally a function of the water chemistry. The rate of localized corrosion (pitting, under deposit, crevice type, etc.) is primarily a function of the localized environment created by deposits, microorganisms, or structure, in addition to the water chemistry. Localized corrosion is of most concern and is responsible for premature failure of equipment.