介绍了管道外腐蚀检测的内容及方法,针对多次发生腐蚀泄漏的输油管线,进行了详细的腐蚀状况检测及数据分析.结果表明:输油管道发生了孔蚀,最终导致腐蚀穿孔;输油管道腐蚀失效的主要原因是防腐层破损,土壤腐蚀性强及极化电位没有达到孔蚀保护电位.针对输油管线的腐蚀分析结果,提出了相对应的防腐措施.
The contents and methods of pipeline external corrosion detection were introduced.Corrosion condition detection and data analysis were conducted in detail for pipeline leakage which occurred many times.The results show that pitting corrosion happened and eventually leads to corrosion perforation.The main reasons of the pipe-line corrosion are anticorrosive coating damage,soil corrosion and polarization potential do not reach protection po-tential of pitting corrosion.According to the analysis,a series of anti corrosion suggestions are given.
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