3PE anticorrosion steel pipes are a corrosion protection technology introduced from abroad in recent years. Full name: Fusion Bonded Epoxy/Extruded Polyethylene Structural Coating, consisting of three layers: the base layer is fusion bonded epoxy (≥80μm); the middle layer is adhesive (170-250μm); and the surface layer is extruded polyethylene (about 2mm). The total thickness of the protective layer is approximately 1.8-3.7mm. In the three-layer structure, the primary function of the fusion bonded epoxy powder coating is to form a continuous film that directly bonds to the steel pipe surface, offering excellent chemical resistance and cathodic disbondment resistance; it reacts with the active groups of the adhesive in the middle layer to form a chemical bond, ensuring good adhesion of the overall protective layer at higher temperatures. The middle layer is typically a copolymer adhesive, primarily composed of polyolefins, currently using vinyl copolymer adhesive. The polar functional groups of the copolymer adhesive can react with the epoxy groups of the fusion bonded epoxy powder coating to form hydrogen bonds or chemical bonds, resulting in good adhesion between the middle and base layers; the non-polar ethylene portion has good affinity with the surface polyethylene, thus ensuring good adhesion between the middle and surface layers as well. The primary role of the polyethylene surface layer is to provide mechanical protection and corrosion resistance, similar to the traditional two-layer structure polyethylene anticorrosion coating.
Standard Grade 3PE Anti-Corrosion Pipe Structure: One layer of epoxy powder (FBE > 100um), two layers of adhesive (copolymer adhesive) 170-250um, and three layers of polyethylene (PE) 2.5-3.7mm. These three materials are tightly integrated and firmly bonded to the steel pipe, forming an excellent anti-corrosion layer.
Advantages of Standard Grade 3PE Coated Steel Pipe:
1. The 3PE anti-corrosion steel pipe offers sealing properties, which can significantly save energy, reduce costs, and protect the environment during long-term operation.
2. Excellent corrosion resistance, quick installation, with a service life up to 30-50 years.
3. Excellent corrosion and impact resistance at low temperatures, with a low water absorption rate of PE (less than 0.01%).
4. Boasts high epoxy strength, low PE water absorption, and excellent softness of hot melt adhesive, offering high anti-corrosion reliability.
Disadvantages of 3PE anti-corrosion steel pipe:
Compared to the cost of other lining materials, the cost is higher. Corrosion-resistant steel pipes can be divided into two categories: internally lined corrosion-resistant steel pipes and externally coated corrosion-resistant steel pipes.
Inner lining corrosion prevention primarily uses cement mortar lined anti-corrosion steel pipes, which are cost-effective. The cement mortar lining serves as a corrosion-resistant layer for the pipes.
3PE coated steel pipes are widely used for exterior anti-corrosion. Anti-corrosion technology involves applying a protective coating to the exterior or interior of steel pipes to safeguard the pipeline. This process can be applied to various types of pipes, including straight seam pipes and spiral pipes.
