Common methods for 3PE coated pipe anti-corrosion

When it comes to protecting 3PE coated pipes from corrosion, it is crucial to employ reliable and effective methods. Corrosion can significantly impact the longevity and functionality of steel pipes, especially in demanding environments. Below are some common techniques used for 3PE coated pipe anti-corrosion.

Steel pipe anti-corrosion generally adopts two common main methods: external coating and cathodic protection. These methods are often used together to provide a comprehensive defense against corrosion.

Although most of the surface of the steel pipe is covered by the coating, a slight leak will cause an incredible corrosion rate, even perforation or cracking. Therefore, in steel pipe anti-corrosion, the combination of the coating system and cathodic protection is essential to achieve a 99.99% coverage rate, preventing future corrosion risks.

The cathodic protection used for steel pipe anti-corrosion is divided into dedicated cathodic protection and impressed current cathodic protection. These methods prevent corrosion by making the steel pipe the cathode of an electrochemical cell.

The purpose of the coating used for 3PE anti-corrosion steel pipes is to form a continuous covering layer of insulating material, which directly prevents the electrolyte from coming into contact with the metal, thus inhibiting the electrolytic reaction that causes corrosion.

The disconnected points in the coating laying process, called leaks, can occur during coating, transportation, or installation. These leaks may also result from coating aging, soil stress, pipeline movement, or third-party damage that goes unnoticed, making it crucial to address these issues promptly.