The process by which metal ions with excess electrons seek other ions to accept electrons, leading to material degradation, is called?

• A. Oxidation
• B. Reduction
• C. General corrosion
• D. Corrosion process

Answer: (D)

The concept being tested is the overall electrochemical degradation of a metal, known as corrosion. Corrosion describes the full sequence of redox reactions between the metal and its environment that lead to material loss and damage. In corrosion, the metal tends to lose electrons (oxidation) and environmental species such as oxygen or water accept those electrons (reduction); the pair of half-reactions together cause the metal to dissolve or form oxides, resulting in degradation. Oxidation and reduction are individual half-reactions within this larger process, not the complete phenomenon. General corrosion is a type of corrosion, but the question points to the broad process itself, which is best described as the corrosion process.