Because polyethylene coated anticorrosive steel pipe is an important anticorrosive material, it has excellent corrosion resistance and long service life, so it has been widely used in petroleum, chemical, electric power, construction and transportation and other fields. This article will introduce the manufacturing process, performance characteristics, application fields and manufacturers of three-layer polyethylene coated anticorrosive steel pipes to help readers better understand this anticorrosive steel pipe.
1. The manufacturing process of three-layer polyethylene coated anticorrosive steel pipe.
The manufacturing process of three-layer polyethylene coated anticorrosive steel pipe mainly includes the following steps: steel pipe pretreatment, epoxy powder coating, adhesive coating, polyethylene anticorrosive layer welding and testing and packaging.
1.Steel pipe pretreatment.
Before applying the anti-corrosion layer, the steel pipe needs to be pre-treated, including rust removal, dust removal and drying. Rust removal is a critical step, and impurities such as rust and oxide scale can be removed from the surface of the steel pipe by sandblasting, pickling or mechanical methods to ensure the adhesion and corrosion resistance of the coating.
2.Epoxy powder coating.
Epoxy powder is a coating with high adhesion and corrosion resistance, which can form a strong protective film on the surface of steel pipes. When coating epoxy powder, the steel pipe needs to be heated to the surface temperature of the powder melting, and then the powder is evenly coated on the surface of the steel pipe by electrostatic spraying or fluidized bed coating.
3.Adhesive application.
After the epoxy powder has been applied, the adhesive needs to be applied. The function of the adhesive is to firmly bond the epoxy powder anti-corrosion layer and the polyethylene anti-corrosion layer together to ensure the integrity and durability of the anti-corrosion layer. The adhesive is generally a mixture of thermoplastic resin and thermosetting resin, which needs to be heated and melted and evenly applied to the surface of the steel pipe.
4.Polyethylene anticorrosive layer welding.
Polyethylene anticorrosive layer is a polymer material, which has the characteristics of good insulation, corrosion resistance and wear resistance. After the adhesive has been applied, the polyethylene corrosion protection layer needs to be welded. During welding, high temperature and high pressure process conditions are required to evenly wrap the polyethylene material on the surface of the steel pipe after melting, forming a dense anti-corrosion layer.
5.Inspect the packaging.
The final step is quality inspection and packaging. Quality inspection mainly includes appearance inspection, thickness inspection and electrical performance testing. The appearance inspection mainly checks whether the anti-corrosion layer has bubbles, cracks and other defects;Thickness detection mainly detects whether the thickness of the anti-corrosion layer meets the requirements;The electrical performance test mainly tests the insulation resistance and voltage resistance of the anti-corrosion layer. After passing the test, it needs to be packed to facilitate transportation and storage.
Performance characteristics of two- and three-layer polyethylene-coated anti-corrosion steel pipes.
Three-layer polyethylene coated anticorrosive steel pipe has the following performance characteristics:
1.Strong corrosion resistance: Polyethylene coating has excellent corrosion resistance, can resist the corrosion of chemical media such as acids, alkalis, salts, etc., and can keep the pipeline intact under long-term use.
2.Good insulation: The polyethylene coating has good insulation, which can effectively prevent the occurrence of electrochemical corrosion and ensure the safe operation of the pipeline.
3.Good abrasion resistance: The polyethylene coating has a certain wear resistance, which can resist the friction and wear of the pipeline during use, and prolong the service life of the pipe.
4.Good anti-aging performance: Polyethylene coating is not easy to age in the natural environment, and can maintain its performance and appearance for a long time.
5.Easy installation: The installation of three-layer polyethylene coated anti-corrosion steel pipe is simple and easy, and can be connected by traditional welding or flange connection methods, which is convenient for construction and maintenance.
6.Environmental protection and safety: The polyethylene coating is non-toxic and tasteless, environmentally friendly, will not produce harmful substances, and is safe and reliable to use.