The anti-corrosion method of anti-corrosion steel pipe is usually to use coating to prevent corrosion. Let us understand the knowledge about coating anti-corrosion. Coating anti-corrosion is to coat the surface of the anti-rust-treated metal pipeline with paint uniformly and tightly to block it from various corrosive media. It is one of the most basic ways of anti-corrosion of steel pipes. Steel pipe anti-corrosion coatings are increasingly using composite materials or composite structures. These raw materials and structures must have good dielectric properties, physical properties, stable chemical properties and a wide range of temperature adaptation.

1. Anti-corrosion coating on the outer wall

Inner wall anti-corrosion coating: In order to avoid corrosion in the pipe, reduce frictional resistance, and increase the throughput, the film is applied to the inner wall of the pipe. Common coatings include amine curing epoxy resin and polyamide epoxy resin, and the coating thickness is 0.038 to 0.2 mm. In order to ensure that the coating is firmly bonded to the pipe wall, the inner wall of the pipe must be surface treated. Since the 1970s, it has tended to use the same raw material for the inner and outer walls of the tube so that the inner and outer walls of the tube can be coated at the same time.

Anti-corrosion and thermal insulation coating: In order to reduce the heat dissipation of the pipeline to the soil, a composite layer of thermal insulation and anti-corrosion is added to the outside of the pipeline on medium and small diameter pipelines that transport petroleum or fuel oil. The common thermal insulation material is rigid polyurethane foam, the applicable temperature is -185～95℃. This raw material has a soft texture. In order to increase its strength, a high-density polyethylene layer is added on the outside of the insulation layer to form a composite structure to prevent groundwater from penetrating into the insulation layer.

2. If the outer protective pipe is a polyethylene pipe, there is no need to do anti-corrosion

Polyethylene is odorless, non-toxic, feels like wax, has good low temperature resistance (at least the use temperature can reach -70～-100℃), has good chemical stability, and can resist most acid and alkali corrosion (not resistant to oxidation) Nature acid), insoluble in common solvents at room temperature, low water absorption, but because it is a linear molecule, it can slowly dissolve in some organic solvents without swelling, and has good electrical insulation properties.

Cangzhou Shenlong Pipe is an enterprise specializing in the production, processing and sales of various steel pipes and pipe fittings. Mainly produce seamless steel pipes, straight seam steel pipes, spiral pipes, galvanized steel pipes, elbows, tees, reducers, flanges, etc. The production process is fully carried out in accordance with the ISO9001 system, and the 5-year pass rate is 100%.
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