How to prevent corrosion in steel pipes? What are the methods?
1. outer wall anticorrosive coating
Data types and application conditions of pipeline outer wall coating.
2. inner wall anticorrosive coating
In order to avoid corrosion, reduce frictional resistance and improve the flow rate, the film is coated on the inner wall of the pipe. The common coatings are amine cured epoxy resin and polyamide epoxy resin. The thickness of coatings is 0.038-0.2mm. In order to ensure the bonding between the coating and the pipe wall, it is necessary to treat the inner surface of the pipe. Since the 1970s, it has tended to use the same data for coating both inside and outside the tube, so that the coating of both inside and outside the tube can be carried out together.
3. anticorrosive thermal insulation coating
In order to reduce the heat dissipation from pipeline to soil, a composite layer of insulation and anticorrosion is added to the outside of the pipeline for medium or small caliber heat-transporting crude oil or fuel oil. The commonly used heat preservation material is rigid polyurethane foam, and the applicable temperature is - 185 - 95 C. In order to improve its strength, a layer of high density polyethylene (HDPE) is added outside the insulation layer to form a composite data structure to avoid groundwater entering the insulation layer.
4. other circumstances
If the outer guard pipe is polyethylene pipe, there is no need to do anti-corrosion. Polyethylene is odorless, non-toxic, waxy-like, has excellent low temperature resistance (the lowest operating temperature can reach - 70 ~100 C), good chemical stability, ability of corrosion of most acids and bases (not resistant to oxidizing acids), insoluble in general solvents at room temperature, water absorption is small, but because it is a linear molecule can be slowly soluble in. Some organic solvents do not swell and have excellent electrical insulation function.
In municipal water supply pipelines, steel pipes need to be treated for internal corrosion besides external corrosion protection. Now the most widely used is the anti-corrosion of cement mortar material. This method is to uniformly coat the inner wall of steel pipe with a layer of cement mortar to make the pipeline maintained. The cement mortar inner anticorrosive coating can not only avoid the corrosion and scaling of the inner wall of the pipeline, extend the service life of the pipeline, but also maintain the water quality, adhere to or improve the pipeline's ability to transport water. It has obvious economic and social benefits. Common cement mortar anticorrosive steel pipe.
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