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| Corrosion is a term used to group the several processes that cause the environmental degradation of materials. These processes include chemical reactions, oxidation or sulphidization, and electrochemical reactions. Corrosion is a major cost component of maintaining an infrastructure and protection against it involves the use of surface coatings, alloying materials to be corrosion resistant, and using cheap sacrificial materials that corrode rather than the structure being protected. | |||||||