3PE anti-corrosion steel pipe, as the name suggests, is a steel pipe with three layers of PE for corrosion protection. 3PE anti-corrosion steel pipe is a widely used type of steel pipe with good corrosion resistance. What anti-corrosion materials make up the structure of 3PE anti-corrosion steel pipe? What are the principles behind the corrosion prevention of 3PE anti-corrosion steel pipe?
1. Pipeline corrosion protection typically employs two main methods: external coating and cathodic protection.
2. Although most of the pipe surface is covered by a coating, even a small leak can lead to an unimaginable corrosion rate, or even perforation or cracking. Therefore, pipeline corrosion protection usually combines coating systems with cathodic protection to achieve 100% coverage and prevent unforeseen consequences.
3. Cathodic protection used in pipeline corrosion protection is divided into sacrificial cathodic protection and impressed current cathodic protection.
4.3PE anti-corrosion steel pipes use a coating to form a continuous insulating layer, directly insulating the metal from the electrolyte in direct contact, thus preventing proper electrolytic reactions.
5. Discontinuities in the coating application process are called leaks. These leaks mainly occur during coating, transportation, or installation, and may also be caused by coating aging, soil stress, or pipe movement in the soil, resulting from failure to detect third-party damage in a timely manner.
6. Impressed current cathodic protection principle: By applying an amplitude current to the protective metal, cathodic polarization occurs until the potential of all cathode points reaches the open-circuit potential of the most active anode point, at which point corrosion on the structure stops.
7. Components of impressed current cathodic protection: rectifier and potentiostat.
8. Rectifier: Converts alternating current (AC) to direct current (DC).
9. 3PE anti-corrosion steel pipe a> Potentiostat: An electronic instrument that automatically controls the pipeline potential to a constant value.
Post time: Dec-25-2025