Chemical or electrochemical degradation of a material through interaction with its environment. Protective surface films can reduce the rate, while film breakdown can localize attack.
Cracking promoted by the combination of tensile stress, a susceptible material and a relevant chemical environment. Neither a corrosion rate alone nor an unexposed tensile test fully characterizes susceptibility.

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Corrosion is a natural process that involves the deterioration of materials, typically metals, as a result of chemical reactions with their environment. This process often leads to the formation of oxides, hydroxides, or other compounds, which can weaken a material's structure and integrity. Corrosion can be caused by factors such as moisture, oxygen, acids, salts, and other environmental agents.