如何對鋼管內(nèi)防腐，有哪些方法？
How to prevent corrosion in steel pipes? What are the methods?
1.外壁防腐涂層
1. outer wall anticorrosive coating
管道外壁涂層資料種類和運(yùn)用條件。
Data types and application conditions of pipeline outer wall coating.
2.內(nèi)壁防腐涂層
2. inner wall anticorrosive coating
為了避免管內(nèi)腐蝕、降低摩擦阻力、進(jìn)步輸量而涂于管子內(nèi)壁的薄膜。常用的涂料有胺固化環(huán)氧樹脂和聚酰胺環(huán)氧樹脂，涂層厚度為 0.038～0.2毫米。為保證涂層與管壁粘結(jié)結(jié)實，有必要對管內(nèi)壁進(jìn)行外表處理。70年代以來趨向于管內(nèi)、外壁涂層選用相同的資料，以便管內(nèi)、外壁的涂敷一起進(jìn)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.防腐保溫涂層
3. anticorrosive thermal insulation coating
在中、小口徑的熱輸原油或燃料油的管道上，為了削減管道向土壤散熱，在管道外部加上保溫文防腐的復(fù)合層。常用的保溫資料是硬質(zhì)聚氨脂泡沫塑料，適用溫度為-185～95℃。這種資料質(zhì)地松軟，為進(jìn)步其強(qiáng)度，在隔熱層外面加敷一層高密度聚乙烯層，構(gòu)成復(fù)合資料結(jié)構(gòu)，以避免地下水進(jìn)入保溫層內(nèi)。
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.其他情況
4. other circumstances
如外護(hù)管是聚乙烯管，無需再做防腐。聚乙烯無臭，，手感似蠟，具有優(yōu)良的耐低溫功能（低運(yùn)用溫度可達(dá)-70～-100℃），化學(xué)安穩(wěn)性好，本領(lǐng)大多數(shù)酸堿的腐蝕（不耐具有氧化性質(zhì)的酸），常溫下不溶于一般溶劑，吸水性小，但由于其為線性分子可緩慢溶于某些有機(jī)溶劑，且不發(fā)作溶脹，電絕緣功能優(yōu)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.
市政給水管道中，鋼管除了進(jìn)行外防腐以外，還需進(jìn)行內(nèi)防腐處理?，F(xiàn)在運(yùn)用多的是水泥砂漿面料防腐，該辦法是在鋼管內(nèi)壁均勻地涂改一層水泥砂漿而使管道得到維護(hù)。水泥砂漿內(nèi)防腐層不但能避免管道內(nèi)壁腐蝕結(jié)垢，延伸管道的運(yùn)用壽命，并能維護(hù)水質(zhì)，堅持或進(jìn)步管道的輸水才能，具有明顯的經(jīng)濟(jì)效益和社會效益。常見的水泥砂漿防腐鋼管。
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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