The impressed current cathodic protection system (ICCP) is used to protect the underwater parts of offshore steel structures from seawater corrosion. Its working principle is to provide DC current through the potentiostat. The positive pole of the power supply is connected to the auxiliary anode, and the negative pole is connected to the steel structure. The circuit is formed by seawater to conduct cathodic polarization of the steel structure. The reference electrode is used for monitoring and detection, so that the protected steel structures are always maintained at the best protection potential and protected from seawater corrosion.
As the offshore steel structure pipeline is immersed in seawater for a long time, a large number of sea creatures such as barnacles will attach to the surface of the steel structure and the inner wall of the pipeline, causing biological corrosion on the surface and blockage of the pipeline, causing great trouble to users.
It is mainly to use the cavitation effect, activation effect, shear effect and inhibition effect of ultrasound in the liquid, and use strong sound field to treat the fluid, so that the physical morphology and chemical properties of marine organisms and scaling substances in the fluid will undergo a series of changes under the action of ultrasound, so that they will be dispersed, crushed, loose and loose, and will not easily attach to the pipe wall to form scale, so that the protected substances will not be corroded and harassed by marine organisms.
It mainly generates sodium hypochlorite solution by electrolysis of seawater containing a certain concentration of chloride ions, and adds sodium hypochlorite to the circulating water to inhibit the growth and reproduction of microorganisms, so as to protect the normal operation of the circulating water system.
At present, sacrificial anode cathodic protection and anti-corrosion coating of magnesium, aluminum, zinc and other metals are mostly used to protect offshore steel structures from corrosion. However, because the steel structures are in the sea water far away from the coastline, it is difficult for users to understand their corrosion conditions clearly, and the manual detection is also affected by the climate, sea conditions, etc., so the detection is very difficult, and the accuracy is not high, and the data is unstable.