黄岛原油码头管道腐蚀的原因分析

ANALYSIS OF THE SEWAGE PIPE CORROSION IN HUANGDAO OIL TERMINAL

本文对青岛黄岛原油码头污水管道造成严重腐蚀的原因,从水质分析、管道材料的金相分析、污水中硫酸盐还原菌检查,以及动电位极化曲线测试等方面进行了试验研究,认为污水中所含硫化物和充足的氧共同加速了管道的均匀腐蚀,而管道中沉积的泥沙和原油造成了“闭塞电池”的局部腐蚀,致使管道局部腐蚀穿孔。文中提出了管内衬水泥是解决管道腐蚀既经济又有效的办法。

Polluted seawater by the petroleum has a violent corrosivity on sewage tube (thickness 8mm) welded by mild steel. The steel sewage tube lasted only six years as a result of the corrosion perforation.Spot investigation, water quality analysis, culture of bacteria, metallographic test and electrochemical measurement etc. show that cause for corrosion is the higher sulphur content of the oil, which becomes a depolarizer, thus accelerates corrosion. Meanwhile the mud, sand, or oil sediments form a 'occluded zone', which also promotes localized corrosion in steel pipes.