Cathodic protection

Cathodic protection is an electrochemical method used to protect metal structures from corrosion. The principle of cathodic protection is to provide the protected metal structure (cathode) with a negative electrical potential, which prevents the ongoing corrosion reaction.

In cathodic protection, an external electric field is created using a voltage source. The anode is located near the protected cathode and is made of a metal with higher electrochemical reactivity. When a voltage source is connected, current flows from the anode to the cathode through the electrolytic medium, creating an electrical circuit.

In this electrical circuit, the cathode becomes the site where the reduction reaction takes place and a protective layer is formed on the surface of the metal. As a result, the metal structure (cathode) is protected from corrosion and degradation.

Cathodic protection is most often used to protect pipelines, tanks, ships, bridges, gas pipelines and other metal structures in aggressive environments such as seawater or soil with high humidity. This method is effective in protecting metal surfaces, even if they are damaged or have a porous structure.

The benefits of cathodic protection include its effectiveness in preventing corrosion, minimizing the need for regular maintenance and increasing the life of metal structures. Properly designed and implemented cathodic protection can significantly reduce the costs associated with repairs and restoration of damaged surfaces.