如何对钢管内防腐，有哪些方法？
How to prevent corrosion in steel pipes? What are the methods?
1.外壁防腐涂层
1. outer wall anticorrosive coating
管道外壁涂层资料种类和运用条件。
Data types and application conditions of pipeline outer wall coating.
2.内壁防腐涂层
2. inner wall anticorrosive coating
为了避免管内腐蚀、降低摩擦阻力、进步输量而涂于管子内壁的薄膜。常用的涂料有胺固化环氧树脂和聚酰胺环氧树脂，涂层厚度为 0.038～0.2毫米。为保证涂层与管壁粘结结实，有必要对管内壁进行外表处理。70年代以来趋向于管内、外壁涂层选用相同的资料，以便管内、外壁的涂敷一起进行。
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.防腐保温涂层
3. anticorrosive thermal insulation coating
在中、小口径的热输原油或燃料油的管道上，为了削减管道向土壤散热，在管道外部加上保温文防腐的复合层。常用的保温资料是硬质聚氨脂泡沫塑料，适用温度为-185～95℃。这种资料质地松软，为进步其强度，在隔热层外面加敷一层高密度聚乙烯层，构成复合资料结构，以避免地下水进入保温层内。
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.其他情况
4. other circumstances
如外护管是聚乙烯管，无需再做防腐。聚乙烯无臭，，手感似蜡，具有优良的耐低温功能（低运用温度可达-70～-100℃），化学安稳性好，本领大多数酸碱的腐蚀（不耐具有氧化性质的酸），常温下不溶于一般溶剂，吸水性小，但由于其为线性分子可缓慢溶于某些有机溶剂，且不发作溶胀，电绝缘功能优良。
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.
市政给水管道中，钢管除了进行外防腐以外，还需进行内防腐处理。现在运用多的是水泥砂浆面料防腐，该办法是在钢管内壁均匀地涂改一层水泥砂浆而使管道得到维护。水泥砂浆内防腐层不但能避免管道内壁腐蚀结垢，延伸管道的运用寿命，并能维护水质，坚持或进步管道的输水才能，具有明显的经济效益和社会效益。常见的水泥砂浆防腐钢管。
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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