What phenomenon describes the electrolytic chemical reaction between dissimilar metals?

The phenomenon that describes the electrolytic chemical reaction between dissimilar metals is galvanic action. This occurs when two different types of metals are in electrical contact with each other in a corrosive environment, such as in the presence of moisture. When this happens, one metal will corrode faster than the other due to a difference in their electrochemical potential, creating a galvanic cell.

In a galvanic couple, the more noble metal (which is less likely to corrode) serves as the cathode, while the less noble metal (which is more susceptible to corrosion) acts as the anode. The anode will lose electrons and corrode, while the cathode enjoys protection as it gains those electrons. This process is a significant concern in plumbing and construction, as it can lead to accelerated wear of pipes, fixtures, and fittings made of less noble metals.

Corrosion is a broader term that encompasses various processes of material degradation, not limited to the specific electrolytic reaction seen in galvanic action. Oxidation refers to the loss of electrons during a chemical reaction, which can occur in many contexts but doesn't specifically describe the interaction between dissimilar metals. Electrolysis involves the process of breaking down compounds with an electric current, which is not