Impressed current cathodic protection (ICCP) is a corrosion protection system consisting of long-lasting anodes which are connected to an external power source (known as a “rectifier”). The external power source, most often a DC power supply, induces a high potential difference between the surface to be protected and the anode.
In the absence of a DC power source, a transformer-rectifier unit connected to an AC power supply can be used. Alternative sources, including wind, solar or gas-powered thermoelectric generators, are also appropriate to be used to power the electrochemical cell.
Impressed current cathodic protection systems are typically used to protect relatively large structures (such as oil & gas pipelines and storage tanks), where passive cathodic protection methods are ineffective or impractical. The anodes employed are generally made of graphite, cast iron, titanium alloys, silicon iron or platinum-niobium clad metals. Jennings Anodes specialize in the manufacture of anodes for ICCP systems which are composed of silicon-iron alloys or MMO activated titanium.