cathodic protection

Cathodic protection is a method used to prevent the electrolytic corrosion of metallic structures, such as pipelines. It works by making the structure act as the cathode, rather than the anode, of an electrochemical cell. Corrosion occurs when a metal surface reacts chemically with its environment, often through oxidation, leading to the metal being converted into more stable forms like oxides or sulfides.12

In metallurgy, preventing corrosion is crucial for the longevity of metal products. Barrier protection, like coatings or plating, can isolate the metal from its environment. Cathodic protection offers another approach by imposing a cathodic polarity on the entire structure. This can be achieved by attaching sacrificial anodes made of a more active metal (like zinc or magnesium) that corrode preferentially, or by using an external electrical current to supply electrons and suppress oxidation. This technique is widely used in shipbuilding and other fields to enhance durability.324