Derui Cathodic Protection Co., Ltd.

The principle of electrochemical corrosion: when a steel-made ship body comes into contact with seawater, an electrical potential is generated, leading to the occurrence of electrochemical corrosion. Therefore, in order to minimize the contact between the ship body and seawater, an anti-rust paint is used to isolate the ship body and seawater. However, the propeller, rudder, or part of the ship body that comes into contact with seawater due to damage to the ship body cannot be completely avoided. Therefore, part of the ship body that comes into contact with seawater will undergo electrochemical corrosion, and the degree of corrosion varies depending on the electrolysis conditions.

An offshore oil drilling platform is a marine metal structure mainly used for drilling wells in the ocean. It is equipped with drilling, power, production, communication and navigation equipment, as well as safety and life-saving facilities for personnel. The reliability and safety of offshore platforms are of great importance. As the depth of the sea where the platform is located becomes deeper, the platform becomes larger, the structure becomes more complex, and the investment also increases. In order to effectively develop offshore oil, provide safety guarantees for production, it is necessary to control corrosion on the platform. Cathodic protection is an important method to prevent marine structures from being corroded by seawater. It can effectively extend the life of offshore drilling platforms in seawater, and the protective effect of cathodic protection on offshore drilling platforms has been confirmed by many practices.

The petrochemical plant area and oilfield buried metal structures mainly include buried metal pipelines, the copper-clad steel grounding grid of the oil storage tanks above ground, etc.

A tank is a large container used to store crude oil or other liquids, consisting of tank walls, tank roof, tank bottom, and accessories. The tank's cathodic protection includes internal cathodic protection and external cathodic protection. Internal cathodic protection can usually be used in tanks, and external cathodic protection can also be used for tanks with longer protection life requirements. The bottom of the tank is usually protected by external cathodic protection due to the difficulty of replacing sacrificial anodes and the requirement for a longer service life.