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首页> 外文期刊>International Journal of Electrochemical Science >Effects of Stray AC Interference on Corrosion Behavior of X70 Pipeline Steel in a Simulated Marine Soil Solution
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Effects of Stray AC Interference on Corrosion Behavior of X70 Pipeline Steel in a Simulated Marine Soil Solution

机译：交流杂散对模拟海洋土壤溶液中X70管线钢腐蚀行为的影响

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摘要

The effects of stray alternating current (AC) on the corrosion behavior of X70 high strength pipeline steel in a marine soil simulated solution was investigated. For a comparison, the study was operated in 3.5% NaCl solution and with an application of 150 MPa tensile stress as well. The electrochemical measurements of open circuit potential (OCP) and potentiodynamic polarization were used to exam the electrochemical process on the X70 steel surface under AC interference. A digital camera and scanning electron microscope (SEM) were used to analysis the corrosion morphology. The results show that a 30 A/m2 AC interference slightly shifted the corrosion potential -0.03 V, while a 300 A/m2 AC signal changed the value as much as -0.2 V. It was well explained with a mathematic model of AC interference. The corrosion rate increased with the AC current density in all test conditions. A corrosion mechanism was proposed to describe the occurrence of AC corrosion on the X70 steel sample surface. A net anodic current, implying an anodic dissolution, was resulted from a complete cycle of AC interference. The corrosion morphology changed from uniform corrosion to pitting corrosion under the AC interference. Thus, stray AC promoted the localized corrosion.
机译：研究了杂散交流电对X70高强度管线钢在海洋土壤模拟溶液中的腐蚀行为的影响。为了进行比较，该研究在3.5％NaCl溶液中进行，并施加了150 MPa的拉应力。使用开路电势（OCP）和电位动力学极化的电化学测量来检查X70钢表面在交流干扰下的电化学过程。用数码相机和扫描电子显微镜（SEM）分析腐蚀形态。结果表明，交流干扰为30 A / m2时，腐蚀电位略微偏移了-0.03 V，而交流干扰为300 A / m2时，腐蚀电位值却最大变化了-0.2V。这可以用交流干扰的数学模型很好地解释。在所有测试条件下，腐蚀速率均随交流电流密度的增加而增加。提出了腐蚀机理来描述X70钢样品表面AC腐蚀的发生。交流干扰的整个周期会产生净阳极电流，这意味着阳极溶解。在交流干扰下，腐蚀形态从均匀腐蚀变为点蚀。因此，杂散交流电促进了局部腐蚀。

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