Reduction (and Oxidation)

 

Reduction is a term commonly used when describing corrosion, such as what occurs in a corrosion cell. It refers to a chemical reaction where a substance gains electrons through an electrolyte from another substance. The substance that gains the electrons is said to be the cathode.

 

Oxidation refers to a chemical reaction where a substance loses electrons through an electrolyte from another substance. The substance that loses the electrons is said to be the anode.