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首页> 外文会议>ASME international pipeline conference 2008 >STRESS CORROSION CRACK INITIATION IN X-65 PIPELINE STEEL UNDER DISBONDED COATING WITH CATHODIC PROTECTION
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STRESS CORROSION CRACK INITIATION IN X-65 PIPELINE STEEL UNDER DISBONDED COATING WITH CATHODIC PROTECTION

机译：X-65管线经阴极保护脱层后应力腐蚀裂纹的产生

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摘要

A novel testing setup has been used in this study to simulate crack initiation in X65 pipeline steel exposed to near-neutral pH soil environment. This test setup was designed to simulate synergistic interactions of cathodic current with soil environments underneath the disbonded coating on the pipe surface. It was found from the simulations that the local environment underneath the disbonded coating can be very acidic or alkaline, instead of near-neutral pH as commonly believed, depending on seasonal fluctuation in CO_2 level and cathodic current. There exists a wide range of corrosion conditions on the steel surface up the gradient of cathodic current underneath the disbonded coating. General corrosion was found to increase as CP current diminishes. Pitting corrosion in terms of number of pits and size of pits was found to be the most severe at locations where cathodic protection was nearly diminished. These locations had also developed some crack like-defects, which were usually elongated in a direction perpendicular to the loading axis and appeared to be formed from a linkage of neighboring pits and by enhanced corrosion at stress raisers.
机译：在这项研究中使用了一种新颖的测试装置来模拟暴露在接近中性pH值土壤环境的X65管线钢中的裂纹萌生。该测试设置旨在模拟阴极电流与管道表面脱粘涂层下方土壤环境的协同相互作用。从模拟中发现，根据CO_2水平和阴极电流的季节性波动，被剥离涂层下面的局部环境可能是非常酸性或碱性的，而不是通常认为的接近中性的pH。在钢表面上，沿剥离涂层下方的阴极电流梯度，存在广泛的腐蚀条件。发现随着CP电流减小，一般腐蚀会增加。发现在点蚀数量和点蚀尺寸方面的点蚀在阴极保护几乎减弱的位置最严重。这些位置还出现了一些裂纹状缺陷，通常在垂直于加载轴的方向上拉长，并且似乎是由相邻凹坑的连接处以及应力产生器处的增强腐蚀所形成的。

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  • 会议地点 Calgary(CA);Calgary(CA);Calgary(CA)
  • 作者

    Bingyan Fang; Abdoulmajid Eslami; Richard Kania; Robert Worthingham; Jenny Been; Weixing Chen;

  • 作者单位

    Department of Chemical and Materials Engineering University of Alberta;

    Department of Chemical and Materials Engineering University of Alberta;

    TransCanada Pipeline Limited Calgary, Alberta, Canada;

    TransCanada Pipeline Limited Calgary, Alberta, Canada;

    Alberta Research Council Edmonton, Alberta, Canada;

    Department of Chemical and Materials Engineering University of Alberta;

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