gradual destruction of materials by chemical reaction with its environment
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Corrosion is the breakdown of materials due to chemical reactions. It is usually oxidation with air molecules and often in the presence of water. Corrosion also occurs when an acidic/basic material touches another material. When a material corrodes, its physical properties change. Problems with corrosion are mostly with metal, though other materials can corrode. Corrosion is a form of erosion. Some materials, such as stainless steel, are highly resistant to corrosion. Metals that may corrode can be protected by plating, painting, and other means.

A corroded industrial structure outside UCSD's Powell Sructural Systems Laboratory.

One form of high temperature corrosion can lead to the formation of compacted oxide layer glazes, which under certain circumstances reduces wear.

Iron corrosion is called rusting.