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总结哪些因素会造成列管冷凝器的腐蚀现象?

人气:1 评论:0 日期:2019-09-04 15:54:46

冷凝器的材料一般以碳钢、不锈钢和铜为主,其中碳钢材质的管板在作为冷却器使用时,其管板与列管的焊缝经常出现腐蚀泄漏,泄漏物进入冷却水系统会造成污染环境及物料的浪费。冷凝器在制作时,管板与列管的焊接一般采用手工电弧焊,焊缝形状存在不同程度的缺陷,如凹陷、气孔、夹渣等,焊缝应力的分布也不均匀。使用时管板部分与工业冷却水接触,而工业冷却水中的杂质、盐类、气体、微生物都会构成对管板和焊缝的腐蚀。研究表明,工业水无论是淡水还是海水,都会有各种离子和溶解的氧气,其中氯离子和氧的浓度变化,对金属的腐蚀形状起重要作用。

The main materials of condenser are carbon steel, stainless steel and copper. When carbon steel tube sheet is used as cooler, corrosion leakage often occurs in the welds between tube sheet and tube. Leakage into cooling water system will cause environmental pollution and waste of materials. During the manufacture of condenser, manual arc welding is usually used for the welding of tube sheet and tube. There are some defects in the weld shape, such as depression, pore, slag inclusion, etc., and the stress distribution of the weld is not uniform. When used, the tubesheet part contacts with the industrial cooling water, and the impurities, salts, gases and microorganisms in the industrial cooling water will constitute the corrosion of the tubesheet and the weld. The results show that industrial water, whether fresh water or seawater, will have various ions and dissolved oxygen, in which chloride ion and oxygen concentration changes play an important role in the corrosion shape of metals.

另外,金属结构的复杂程度也会影响腐蚀形态。因此,管板与列管焊缝的腐蚀以孔蚀和缝隙腐蚀为主。从外观看,管板表面会有许多腐蚀产物和积沉物,分布着大小不等泡。以海水为介质时,还会产生电偶腐蚀。双金属腐蚀也是管板腐蚀的一种常见现象。

In addition, the complexity of metal structure also affects the corrosion morphology. Therefore, pitting corrosion and crevice corrosion are the main corrosion types in the welds of tube sheets and tubes. From the appearance, there will be a lot of corrosion products and deposits on the surface of tubesheet, and there will be bubbles of different sizes. When seawater is used as medium, galvanic corrosion will also occur. Bimetallic corrosion is also a common phenomenon of tubesheet corrosion.

针对冷凝器防腐问题,西方多采用高分子复合材料的方法进行保护。其具有优异的粘着性能及抗温、抗化学腐蚀性能,在封闭的环境里可以安全使用而不会收缩,特别是良好的隔离双金属腐蚀和耐冲刷性能,从根本上杜绝了修复部位的腐蚀渗漏,为冷凝器提供一个长久的保护涂层。

In view of the anti-corrosion problem of condenser, polymer composite materials are mostly used to protect condenser in Western countries. It has excellent adhesion, temperature resistance and chemical corrosion resistance. It can be safely used in closed environment without shrinkage. Especially, it has good anti-corrosion and anti-erosion properties of bimetal, which fundamentally prevents corrosion leakage in repaired parts and provides a long-term protective coating for condensers. 

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