Corrosion: (ASTM) deterioration of a material, usually a metal, that results from a chemical or electrochemical reaction with its environment.
Erosion: (ASTM) progressive loss of original material from a solid surface due to mechanical interaction between the surface and a fluid, a multicomponent fluid, or impinging liquid or soil particles .
Cavitation: (ASTM) formation and subsequent collapse within a liquid, of cavities or bubbles that contain vapour or a mixture of vapour and gas.
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