Polyethylene-Coated Anti-Corrosion Steel Pipe utilizes ordinary carbon steel pipe as its substrate; through a specialized surface treatment process, one or more layers of polyethylene anti-corrosion coating are applied to the surface, resulting in a composite anti-corrosion piping material. The polyethylene material provides resistance against corrosion caused by soil, groundwater, acidic media, and similar elements, thereby effectively extending the service life of the steel pipe and reducing future maintenance and replacement costs. The Polyethylene-Coated Anti-Corrosion Steel Pipe primarily consists of a three-layer structure, wherein each layer works in concert with the others to form a comprehensive anti-corrosion barrier. The detailed composition and function of each layer are as follows:
Fusion Bonded Epoxy (FBE) Powder Coating: This constitutes the first line of defense for the polyethylene-coated anti-corrosion steel pipe. With a controlled thickness of over 120 μm, it forms a tight bond with the steel pipe substrate, exhibiting excellent adhesion, chemical corrosion resistance, and electrical insulation properties;
Copolymer Adhesive Layer: Serving as the intermediate layer connecting the outer and inner coatings, this layer has a thickness ranging from 170 to 250 μm. It firmly bonds the two adjacent layers together, effectively preventing issues related to delamination. Furthermore, the copolymer adhesive layer possesses excellent thermal stability, corrosion resistance, and anti-aging properties; it is adaptable to a wide range of ambient temperatures and will not suffer from embrittlement or degradation during long-term service;
High-Density Polyethylene (HDPE) Coating: This serves as the outermost protective layer of the polyethylene-coated anti-corrosion steel pipe. Applied using high-density polyethylene (HDPE) material, the coating thickness can be flexibly adjusted to meet specific anti-corrosion grade requirements stipulated by the client. The HDPE material features a controlled density of 0.940–0.960 g/cm³ and a tensile strength of ≥22 MPa; its exceptional flexibility and impact resistance enable it to withstand unforeseen incidents-such as collisions or dragging-that may occur during transportation and construction;
Carbon Steel Pipe: This constitutes the substrate of the polyethylene-coated anti-corrosion steel pipe. High-quality carbon steel pipes-such as grades Q235B and Q355B-are selected for this purpose. With a nominal diameter range spanning DN20 to DN3600 mm and wall thicknesses ranging from 3 to 20 mm, these pipes are capable of meeting operational requirements across various pressure ratings.
The selection of raw materials directly determines the quality of Polyethylene-Coated Anti-Corrosion Steel Pipes. We have established a rigorous system for raw material procurement and inspection, subjecting every batch of materials to strict controls to ensure that their performance meets the requirements for both production and end-use. The detailed inspection procedures are as follows:
Base Material Procurement: We select high-quality raw materials; in addition to requiring detailed inspection reports from suppliers, we conduct comprehensive pre-acceptance testing-covering aspects such as material composition, dimensions, and mechanical properties-to ensure full compliance with production specifications;
Coating Material Procurement: We prioritize the inspection of critical parameters, such as the adhesion and cathodic disbondment resistance of epoxy powders, as well as the bonding strength and thermal stability of adhesives. Any raw materials that fail to meet these standards are strictly prohibited from entering the production process.
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