Marine environment is a complex corrosive environment. Seawater is an electrolyte solution containing a variety of salts. The corrosion of metals by seawater is the effect of a variety of integrated factors, including chemical, physical and biological factors. Marine corrosion is the corrosion of metal components in the marine environment.

External current cathodic protection system is a kind of electrochemical protection technology, its principle is by applying a kind of cathodic current on the protected structure, so that the anodic corrosion rate as well as the dissolution rate of the protected structure is greatly reduced, or even the corrosion rate or dissolution rate can be reduced to a minimum to avoid or weaken the occurrence of corrosion.

There are two main types of anti-sea life devices most commonly used: electrolytic seawater devices and anti-fouling devices, which are used to kill sea life and electrolytic copper, aluminum and iron electrode ways by generating hypochlorous acid. Cathodic protection rectifier in the electrolysis of seawater as a conductor through the way of applied current electrolysis of metal ions, and then generate anti-sea life ions and anti-corrosion type ions of electrolyte, so that the metal ions in seawater to a certain concentration, and then pumped out by the seawater pump, distributed to the entire seawater cooling pipe system, so as to effectively kill the sea life in the pipe system to ensure the smooth flow of seawater pipeline, as well as to prevent corrosion of the pipe system It is suitable for ocean-going and offshore vessels. It is suitable for the seawater cooling circulation system of ocean-going and offshore vessels, offshore oil drilling platforms and coastal power plants.