How does cathodic protection work on pipelines?

Commonly used to protect numerous structures such as pipelines, ships, tanks and offshore oil platforms, cathodic protection works by allowing a more reactive, sacrificial metal to corrode instead of the protected metal. During this process, the anode experiences corrosion, while the cathode remains unaffected.

Why is it necessary to provide cathodic protection of a pipeline?

Cathodic protection is the most common electrochemical technique used to prevent corrosion on buried metallic pipelines where the applied coating has failed or been damaged exposing bare pipeline metal to the soil.

What is the principle involved in cathodic protection explain the protection of buried pipelines from corrosion diagrammatically by impressed current method?

Cathodic Protection Principles Corrosion is an electrochemical process, normally occurring at the anode but not the cathode. The principle of cathodic protection is to connect an external anode to the metal to be protected and to pass a DC current between them so that the metal becomes cathodic and does not corrode.

How can corrosion in metals be prevented by cathodic protection?

Cathodic protection protects by electrochemical means. To prevent corrosion, the active sites on the metal surface are converted to passive sites by providing electrons from another source, typically with galvanic anodes attached on or near the surface. Metals used for anodes include aluminum, magnesium, or zinc.

What are the advantages of cathodic protection?

Cathodic protection offers an optimum of safety and efficiency because with a cathodic protection system, pipelines can be reliably operated even in critical soils. Cathodic protection should be considered wherever the system is exposed to an aggressive surrounding.

How does cathodic protection system work?

How does cathodic protection work? Cathodic protection works by placing an anode or anodes (external devices) in an electrolyte to create a circuit. Current flows from the anode through the electrolyte to the surface of the structure. Corrosion moves to the anode to stop further corrosion of the structure.

What is cathodic protection explain impressed current cathodic protection?

Impressed current cathodic protection (ICCP) is a corrosion protection system consisting of sacrificial anodes connected to an external power source. The external power source, often a DC power supply, provides the current necessary to drive the electrochemical reaction required for cathodic protection to occur.