What are the reasons for defects on the surface of 3PE anti-corrosion steel pipes?
Release time:
2021-03-31
There are many reasons behind surface defects in 3PE-coated steel pipes. Today, let’s take a comprehensive look at them. The 3PE anti-corrosion coating for buried steel pipelines is a pipeline corrosion protection technology developed and successfully implemented in Europe—particularly in Germany—in the 1980s. It consists of three layers: an inner epoxy powder coating, an intermediate adhesive layer, and an outer polyethylene layer. The epoxy powder coating boasts excellent adhesion to metal surfaces and outstanding resistance to oxidation, while the polyethylene coating exhibits superior impact resistance and resistance to water penetration. By combining these two layers through the intermediate adhesive, the resulting coating fully leverages their respective advantages while effectively compensating for their shortcomings. Given this...
3PE anti-corrosion steel pipe There are many causes of surface defects. Today, let’s take a comprehensive look at them together. The 3PE anti-corrosion coating for buried steel pipelines is a pipeline corrosion protection technology developed and successfully implemented in Europe—particularly in Germany—in the 1980s. It consists of three layers: an inner epoxy powder coating, an intermediate adhesive layer, and an outer polyethylene layer. The epoxy powder coating boasts excellent adhesion to metal surfaces and outstanding resistance to oxidation, while the polyethylene coating exhibits superior impact resistance and impermeability to water. By combining these two layers with the intermediate adhesive, the 3PE coating fully leverages the strengths of each component while effectively addressing their respective weaknesses. Given the 3PE coating’s exceptional overall performance, it has gained widespread adoption worldwide. Consequently, in many large-scale pipeline projects, 3PE-coated steel pipes have become the standard choice for corrosion protection.
Quality control of the anti-corrosion coating for 3PE-coated steel pipes involves numerous processes and a relatively complex manufacturing procedure, with many factors influencing product quality. Any improper operation in any one of these processes can adversely affect the quality of the anti-corrosion steel pipe. According to the quality requirements specified in industry standard SY/T0413-2002, common quality issues with 3PE-coated steel pipes include surface pitting, coating bubbles, water impact marks on the surface, uneven coating thickness, surface wrinkles, and low adhesion strength at the coated end edges.
According to industry standards, the coating of 3PE anti-corrosion steel pipes—specifically, the polyethylene layer—should have a smooth surface free of pinholes, roughness, uneven coloration, and cracks. Therefore, during production, it is essential to prevent the formation of pinholes on the polyethylene surface. The main causes of pinhole formation include uneven plasticization of the polyethylene material, impurities in the polyethylene material, and the presence of volatile small-molecule components within the polyethylene material. To effectively control pinhole formation, measures should be taken to address these underlying causes: increasing the plasticization temperature, extending the plasticization time, and selecting high-quality polyethylene raw materials.
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