Epoxy coating: With good adhesion, chemical corrosion resistance and mechanical strength, it can effectively isolate the contact between the pipe and the soil, and prevent the erosion of the pipe by moisture, oxygen and corrosive ions in the soil.
Polyethylene coating: With excellent corrosion resistance, wear resistance and insulation properties, it can form a tough protective film on the surface of the pipe to extend the service life of the pipe.
Polyurethane coating: With good flexibility, wear resistance and weather resistance, it is suitable for complex soil environments and can adapt to the deformation and stress changes of the pipe in the soil.
Ensure the quality of the coating: Before applying the anti-corrosion coating, the surface of the pipe should be thoroughly pretreated, such as rust removal, oil removal, surface roughening, etc., to improve the adhesion of the coating to the pipe surface. At the same time, strictly control the thickness and uniformity of the coating to avoid coating defects such as pinholes, bubbles, etc., which will cause local corrosion and reduce the durability of the pipe.
Cathodic protection measures
Sacrificial anode protection method: some metals that are more active than the pipeline metal, such as magnesium, zinc, etc., are buried near the pipeline as sacrificial anodes. These sacrificial anodes will corrode preferentially in the soil, thereby providing cathodic protection current for the pipeline, making the pipeline in a cathodic polarization state, and inhibiting the corrosion reaction of the pipeline. This method is simple and easy to implement, and is suitable for short-distance and small-scale pipeline systems.
Impressed current cathodic protection method: By applying an external DC power supply to the pipeline and connecting the pipeline to the negative pole of the power supply, the pipeline surface is cathodic polarized, thereby preventing corrosion from occurring. This method can provide a larger protection current and is suitable for long-distance and large-diameter pipelines, but it requires professional equipment and technicians for maintenance and management.
