What is the difference between oxidation and corrosion in metals?

What is the difference between oxidation and corrosion in metals?

• A. Oxidation is a chemical reaction with oxygen forming oxide; corrosion is the broader degradation of metal due to electrochemical or environmental processes, including oxidation, pitting, and galvanic effects.
• B. Oxidation is the removal of metal by acid; corrosion is only dissolution.
• C. Oxidation is electrochemical dissolution; corrosion is purely mechanical wear.
• D. Oxidation and corrosion are identical processes with different names.

Answer: (A)

Oxidation is the chemical reaction where metal atoms lose electrons and form oxides by reacting with oxygen. Corrosion is the broader degradation of a metal caused by electrochemical or environmental processes in a hostile environment, which often includes oxidation but also other forms of attack such as pitting, crevice corrosion, galvanic coupling, and dissolution in electrolytes. In other words, oxidation is a specific oxygen-related reaction, while corrosion is the overall deterioration mechanism that can involve oxidation as one of its pathways. For example, iron rusts because it oxidizes in the presence of water and oxygen, but corrosion as a process can also involve localized attacks and electrochemical cells that accelerate material loss beyond simple oxide formation.

Oxidation is the chemical reaction where metal atoms lose electrons and form oxides by reacting with oxygen. Corrosion is the broader degradation of a metal caused by electrochemical or environmental processes in a hostile environment, which often includes oxidation but also other forms of attack such as pitting, crevice corrosion, galvanic coupling, and dissolution in electrolytes. In other words, oxidation is a specific oxygen-related reaction, while corrosion is the overall deterioration mechanism that can involve oxidation as one of its pathways. For example, iron rusts because it oxidizes in the presence of water and oxygen, but corrosion as a process can also involve localized attacks and electrochemical cells that accelerate material loss beyond simple oxide formation.