How does cathodic protection prevent rusting?

Cathodic protection (CP) is a technique used to control the corrosion of a metal surface by making it the cathodic side of an electrochemical cell. The simplest method to apply CP is by connecting the metal to be protected with another more easily corroded metal to act as the anode of the electrochemical cell.

What is meant by cathodic protection?

Cathodic protection is a method for preventing corrosion on submerged and underground metallic structures. Cathodic protection is one of the most effective methods for preventing corrosion on a metal surface.

What is cathodic 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 are the types of cathodic protection?

There are two types of cathodic protection, galvanic protection and impressed current.

What can cathodic protection systems be used for?

Cathodic protection is one of the few methods of corrosion control that can be effectively used to control corrosion of existing buried or submerged metal surfaces. Cathodic protection systems are most commonly used to protect: Steel. Water or fuel pipelines. Storage tanks. Steel pier piles.

How does cathodic protection work in a galvanic cell?

Cathodic protection is an electrochemical means of corrosion control in which the oxidation reaction in a galvanic cell is concentrated at the anode and suppresses corrosion of the cathode in the same cell.

Is there any way to prevent cathodic corrosion?

This way, no corrosion will take place. There are two methods that can be used to prevent cathodic corrosion: Couple the structure with a more active metal. For example, when the structure is made from steel, you can couple it with magnesium or zinc.

How are sacrificial anodes used in cathodic protection?

The number of sacrificial anodes required to deliver enough current to provide adequate protection can either be unrealistic or impractical. To address this, an external power source is used to assist in driving the electrochemical reactions. This technique is known as impressed current cathodic protection (ICCP).