The deterioration of a metal resulting from electrochemical reactions with the environment is referred to as which?

• A. Erosion
• B. Corrosion
• C. Wear
• D. Fatigue

Answer: (B)

Corrosion is the deterioration of a metal caused by electrochemical reactions with its surrounding environment. This process often involves oxidation, where the metal forms oxides or salts as electrons are transferred to molecules in the environment, such as oxygen in air or water. A familiar example is iron rust forming when iron is exposed to moisture and oxygen. This electrical-chemical nature of corrosion distinguishes it from other mechanisms. Erosion is the physical removal of material by moving particles or fluid flow, wear is material loss due to friction between surfaces, and fatigue is cracking from repeated cyclic stresses. Therefore, the deterioration described is corrosion because it specifically results from electrochemical reactions with the environment.