中东地区铜管腐蚀泄漏原因分析

Analysis on Corrosion Leakage of Copper Tube in Middle East

中东地区的铜管发生腐蚀泄漏。为了探究铜管泄漏的根本原因,对铜管的腐蚀形貌及腐蚀产物进行分析,同时对当地的空气成分进行检测。结果表明:铜管表面发生全面腐蚀,泄漏位置位于焊缝,泄漏处的腐蚀产物中存在S元素。铜管泄漏的主要原因是下水道腐殖物发酵生成的SO_(2)和H2S污染性气体,加速铜管尤其是焊缝位置腐蚀,其焊缝腐蚀产物的脱落协同铜管的表面腐蚀导致铜管焊缝处漏穿。通过隔离腐蚀性气体以及对铜管进行环氧树脂防腐涂层防护,可以降低泄漏率,提高钢管使用寿命。

Corrosion leakage of copper tube occurred in Middle East.To clarify the failure causes,the corrosion appearance of the copper tubes and the corrosion products on the leakage point were analyzed.Furthermore,the local air composition in Middle East was detected.The results showed that the surface of the copper tube was generally corroded,with S element detected on the leakage position and in the corrosion products at the leakage site.The main cause of the copper tube leakage is that the polluting gases SO_(2) and H2S generated by the humus fermentation,which accelerated the corrosion of the copper tube,especially the weld joint.It is the corrosion of the weld joint along with the corrosion in the outer surface of the copper,leads to the leakage of copper tube.There are two main ways to reduce the leakage rate,isolating corrosive gas and protecting copper tubes by epoxy coating,which prolongs the operation life of copper tube.