Cathode

In plumbing, the term “cathode” is typically used in the context of cathodic protection systems, which are employed to prevent corrosion in metal pipes and tanks. The cathode is the negatively charged electrode where reduction reactions occur, making it less susceptible to oxidation and corrosion. In water heaters, the sacrificial anode rod (made of magnesium, aluminum, or zinc) sacrifices itself to protect the steel tank, which acts as the cathode, thereby reducing the likelihood of rust formation. Cathodic protection is also used in underground pipelines, water storage tanks, and other metal infrastructure to extend the lifespan and maintain the integrity of the system. Regular inspection and replacement of sacrificial anodes are essential to ensure continuous protection of the cathodic components.