Cathodic Protection (CP) is an electrochemical method of corrosion prevention which can be applied to metals exposed to conductive environments i.e. buried or immersed. The technique utilises the circulation of a continuous current between an electrode (anode) placed in the environment and the metallic structure to be protected (cathode). This cathodic current lowers the potential of the metal and in turn reduces its corrosion rate.
Cathodic protection current is provided by one of two types of system (or a combination of both);
- Sacrificial / Galvanic
- Impressed Current (ICCP)