Coating anti-corrosion is usually the anti-corrosion method of anti-corrosion steel pipe. Let Shenlong Pipeline take you to understand the knowledge of anti-corrosion coating! Let's take a look!

Coating anti-corrosion refers to uniformly coating a layer of paint on the surface of rusty metal pipes to isolate them from various corrosive media. It is one of the most basic ways of steel pipe anti-corrosion. Composite materials or composite structures are increasingly used as anti-corrosion coatings on steel pipes. These materials and structures should have excellent dielectric properties, physical properties, stable chemical properties and wide temperature adaptability.

1. Outer wall anticorrosive coating

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The type and use conditions of the outer wall coating of the pipeline.

2.The inner wall anti-corrosion coating

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In order to better avoid corrosion in the pipeline, reduce frictional resistance and increase production, the film is coated on the inner wall of the pipeline. Common coatings are amine cured epoxy resin and polyamide epoxy resin with a thickness of 0.038~0.2mm. The inner wall of the pipe must be surface treated to ensure that the coating adheres firmly to the pipe wall. Since 1970, it has tended to use the same material for inner and outer wall coatings so that both inner and outer wall coatings can be applied.

3.Anti-corrosion insulation coating

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In order to better reduce the heat dissipation of the soil on the medium and small diameter heat-conducting crude oil or fuel oil pipelines, a heat-insulating and anti-corrosion composite layer is added to the outside of the pipeline. The common insulating material is rigid plastic polyurethane foam with soft texture and suitable temperature of -185~95℃. In order to better improve its strength, a layer of high-density polyethylene is added to the outside of the insulation layer to form a composite structure to prevent groundwater from penetrating into the insulation layer.

4.Other circumstances

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If the external protective pipe is a polyethylene pipe, there is no need for corrosion protection. Polyethylene is odorless, non-toxic, feels like wax, has excellent low temperature resistance (the lowest working temperature can reach -70 ~ -100 ℃), excellent chemical stability, and can withstand most acid and alkali corrosion (not Oxidation resistance), insoluble in common solvents at room temperature, and low water absorption, but since it is a linear molecule, it can be slowly dissolved in some organic solvents without swelling, and has excellent electrical insulation properties .

Shenlong Pipeline is an enterprise specializing in the production, processing and sales of various steel pipes and fittings. The annual output is about 150,000 tons of steel pipes and 40,000 tons of pipe fittings. Our main products include seamless steel pipes, straight seam steel pipes, spiral pipes, galvanized steel pipes, elbows, tees, reducers, flanges, etc. As a professional steel pipe manufacturer, we can provide first-class quality and professional technical services! Welcome to contact us!