Cathodic protection is a technique used to prevent the corrosion of metal structures, such as pipelines, ships, and offshore platforms.

It works by using an electric current to create a protective coating on the metal surface, which prevents the formation of rust and other corrosion products. In cathodic protection systems, a direct current is applied to the metal surface using a cathode, which is typically made of zinc or aluminum.

The current flows through the metal and creates an electrical potential, which inhibits the formation of corrosion.

Cathodic protection is a common method for protecting metal structures from corrosion, and it is used in a variety of industries, including oil and gas, marine, and construction.