What is the role of an anode in cathodic protection?

In the context of cathodic protection, the anode plays a critical role by both attracting electrons and serving as a current source. When a metal structure is protected through cathodic protection, it is typically connected to an external anode, which is made from a material that is more easily corroded than the metal being protected.

By attracting electrons, the anode facilitates the flow of current. This flow of electrons occurs because electrical current is directed from the anode to the cathode (the metal structure). The electrochemical reaction that takes place leads to the anode corroding instead of the protected metal. This process reduces the overall corrosion rate of the metal structure, effectively preventing damage over time.

Both the attraction of electrons and the anode’s function as a current source work together to ensure that the metal surface remains protected from corrosion, thus contributing to the longevity and integrity of the structure being safeguarded.