A system used to protect pipelines from corrosion is known as what?

The correct answer is cathodic protection, which is a technique specifically designed to prevent or mitigate corrosion on metal structures, particularly pipelines and tanks, that come into contact with soil or water. This method operates by making the protected metal surface the cathode of an electrochemical cell, which hinders the oxidation process that leads to corrosion.

In cathodic protection systems, a more easily oxidized metal (usually referred to as the anode) is deliberately connected to the pipeline. This sacrificial anode will corrode instead of the pipeline, thereby protecting it. Another variant is impressed current cathodic protection, which uses an external power source to impose a current onto the structure.

Understanding cathodic protection is crucial for anyone involved in corrosion management, as it plays a vital role in extending the life of pipelines and ensuring the safety of infrastructure.