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首页> 外文会议>Icorr/NACE corrosion odyssey 2001: a premier corrosion event in Edinburgh >Aesthetic Improvements can Cause Severe Corrosion Problems. Case History in Stainless Steel Piping with Organic Coated Victaulic Joints. Desalination Water Plant
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Aesthetic Improvements can Cause Severe Corrosion Problems. Case History in Stainless Steel Piping with Organic Coated Victaulic Joints. Desalination Water Plant

机译：美学上的改进会导致严重的腐蚀问题。具有有机涂层的唯特利接头的不锈钢管道的案例历史。海水淡化厂

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Case history is presented for 304L stainless steel piping system in a desalination water plant.rn304L SS elbows, transporting incoming sea water and out coming salted brines, are fittedrnwith Victaulic joints to a reverse osmosis membrane bodies. Morphology of this kind ofrnfittings, combined with working pressure, allow seawater and brines to be in contact with thernexternal surface of different SS pipes at their edges.rnExperience demonstrated that when Victaulic joints are uncoated they electrically bridge thernelbows, so same potentials can be observed in all parts of the metallic piping system. Underrnthis configuration no major corrosion appeared on SS piping for more than five years. In thisrncase corrosion only affected, not severely, the body of the joint made by carbon steel. Forrnaesthetic reasons, to avoid rusting appearance, this kind of fittings were organically coated inrnone of the reverse osmosis frame. This improvement causes electrical isolation of elbowsrnwith the rest of the piping system. Rubber gaskets inside the joint in contact with externalrnpart of the SS pipes also creates a little rim with lack of oxygen. In consequence, becausernseawater and brines can reach external part of the SS pipes, inside the Victaulic joint body,rncrevice corrosion appeared under rubber gaskets and accelerated rapidly. Major crevicerncorrosion of SS developed in no more than six months after the improvement at the externalrnpart of the SS pipe edges, causing potential breakdowns of the system. Meanwhile, otherrnframes with uncoated Victaulic joints rested without appreciable corrosion at the SS pipes.rnThe aim of this work is to describe the actions done to analyse the corrosion causes, tornpropose solutions, and also to warn engineers about how corrosion is always present, andrnmust keep in mind when designing or modifying an existing piping system. Aestheticrnperformance can always result in major expenditures and new undesired problems if they arerncorrosion related.
机译：介绍了海水淡化厂中304L不锈钢管道系统的使用案例。304L SS弯头用于输送进来的海水和出入的咸盐水，并装有唯特利接头与反渗透膜体。此类接头的形态与工作压力相结合，使海水和盐水在其边缘处与不同SS管的外部表面接触。经验表明，当唯特利接头未涂层时，它们电桥了r头，因此在金属管道系统的所有零件。在这种配置下，超过五年没有出现严重腐蚀。在这种情况下，腐蚀仅影响但不严重影响由碳钢制成的接头的主体。出于美学原因，为避免生锈，这种配件被有机涂覆了反渗透框架的内酯。这种改进导致弯头与管道系统的其余部分电气隔离。与SS管的外部接触的接头内部的橡胶垫圈也会形成一个缺氧的边缘。结果，由于海水和盐水可以到达SS管的外部，在唯特利接头体内，因此在橡胶垫圈下出现缝隙腐蚀并迅速加速。 SS管边缘外部改善后不超过六个月，SS就出现了严重的缝隙腐蚀，从而导致系统潜在的故障。同时，其他没有涂层的唯特利接头的框架在SS管道上没有明显腐蚀地搁置。这项工作的目的是描述为分析腐蚀原因，提出解决方案而采取的措施，并警告工程师如何始终存在腐蚀并且必须保持腐蚀。设计或修改现有管道系统时要牢记。如果美学表现与腐蚀有关，则总会导致大量支出和新的不良问题。

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