黄亮亮, 孟惠民, 黄晓林, 陈建民, 胡景克, 王育青. X60管线钢在盐碱性土壤中的腐蚀行为与机理[J]. 油气储运, 2013, 32(3): 257-262. DOI: 10.6047/j.issn.1000-8241.2013.03.006
引用本文: 黄亮亮, 孟惠民, 黄晓林, 陈建民, 胡景克, 王育青. X60管线钢在盐碱性土壤中的腐蚀行为与机理[J]. 油气储运, 2013, 32(3): 257-262. DOI: 10.6047/j.issn.1000-8241.2013.03.006
Huang Liangliang, Meng Huimin, Huang Xiaolin, Chen Jianmin, Hu Jingke, Wang Yuqing. Corrosion behaviors and mechanism of X60 pipe steel in saline and alkali soil[J]. Oil & Gas Storage and Transportation, 2013, 32(3): 257-262. DOI: 10.6047/j.issn.1000-8241.2013.03.006
Citation: Huang Liangliang, Meng Huimin, Huang Xiaolin, Chen Jianmin, Hu Jingke, Wang Yuqing. Corrosion behaviors and mechanism of X60 pipe steel in saline and alkali soil[J]. Oil & Gas Storage and Transportation, 2013, 32(3): 257-262. DOI: 10.6047/j.issn.1000-8241.2013.03.006

X60管线钢在盐碱性土壤中的腐蚀行为与机理

Corrosion behaviors and mechanism of X60 pipe steel in saline and alkali soil

  • 摘要: 基于土壤性质检测,室内模拟实验,实际管道防腐层绝缘性测试、杂散电流测试,爆管处腐蚀形貌比较,管道埋地实际状况分析,研究了X60管线钢在黄河下游冲击平原土壤中的腐蚀行为。结果表明:黄河下游冲击平原土壤具有强碱、高含盐(主要为高NaCl)、高腐蚀性质;X60管线钢均匀腐蚀轻微,但会发生严重的坑腐蚀,腐蚀过程是:X60管线钢在水含量高甚至饱和的高含NaCl土壤中发生Fe氧化腐蚀反应,钢表面先形成含水FeOOH内腐蚀产物膜,腐蚀产物膜虽对基体具有一定的保护作用,但因Cl-渗入内腐蚀产物膜产生局部破坏,导致严重的坑腐蚀,并可能发展为爆管破坏。

     

    Abstract: In this paper, the corrosion behavior of X60 pipe steel is studied in the soil of alluvial plain downstream of the Yellow River based on soil property test, indoor simulation experiment, actual pipeline coating insulation test, stray current test and comparison of corrosion morphology at pipe bursting location, and actual buried situation of pipeline. Results show that the soil of alluvial plain downstream of the Yellow River is strong basic, high salt content (mainly including NaCl) and highly corrosive soil. For X60 pipe steel, uniform corrosion is slight but pit corrosion is serious, the corrosion process is that X60 pipe steel undergoes iron oxidation reaction in the soil with high water content even saturated water content and high NaCl content, an FeOOH inner corrosion product film containing water will firstly form on the steel surface and have certain protective functions against base material, but local damage may occur for inner corrosion product film due to Cl- penetration, and thus resulting in serious pit corrosion, which may develop into pipe bursting damage.

     

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