katoodkaitset

Katoodkaitset, also known as cathodic protection, is a technique used to prevent corrosion of a metal surface by making it the cathode of an electrochemical cell. This is achieved by supplying a direct current to the metal structure. The current can be supplied by a sacrificial anode, which is a more reactive metal that corrodes instead of the protected structure, or by an impressed current system that uses an external DC power source.

The principle behind cathodic protection is to shift the electrochemical potential of the metal to a more negative value. This negative potential prevents the metal from oxidizing, which is the process of corrosion. In a typical corrosion cell, a metal acts as an anode, losing electrons and forming metal ions. In a cathodic protection system, the protected metal becomes the cathode, where reduction reactions occur, such as the reduction of oxygen or water.

Cathodic protection is widely used to protect a variety of metal structures, including pipelines, storage tanks, bridges, offshore platforms, and ship hulls. It is an effective and long-lasting method for extending the service life of these critical assets and preventing costly failures. The effectiveness of a cathodic protection system depends on factors such as the electrolyte (e.g., soil, water), the nature of the metal being protected, and the presence of other metals. Regular monitoring and maintenance are essential to ensure the system continues to provide adequate protection.