Effects of alternating current interference on corrosion of X60 pipeline steel
Effects of alternating current interference on corrosion of X60 pipeline steel
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DOI：
10.1007/s12182-015-0022-0
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发表时间：
2015-06-01
影响因子：
5.6
通讯作者：
Liu, Shu-Hai
中科院分区：
文献类型：
--
作者：
Guo, Yan-Bao;Liu, Cheng;Liu, Shu-Hai
随着中国经济的快速发展，对能源和交通的需求越来越大。由于地形、交通等因素的限制，大量地埋油气管道与高压输电线路、电气化铁路长距离平行。在这种情况下，管道的交流腐蚀是非常严重的。在这项工作中，实验室实验采用电化学方法在模拟土壤溶液中进行，交流电流密度从0到200 a /m(2)，交流频率从10到200 Hz。实验结果表明，随着交流电流密度的增大，X60钢电极的腐蚀电位负向移动，阳极电流密度显著增大，腐蚀速率加快。此外，随着交流频率的增加，X60电极的腐蚀电位正向移动，阳极电流密度减小，导致腐蚀速率降低。此外，X60电极的形貌表明，在低交流电流密度下发生均匀腐蚀；在高交流电流密度下，X60电极表面出现腐蚀坑，深腐蚀坑严重损坏管道，可能导致泄漏。
With rapid economic development in China, demand for energy and transportation is growing. Due to the limitations of factors such as terrain and traffic, a large number of buried oil and gas pipelines are parallel to high-voltage transmission lines and electrified railways over long distances. Alternating current (AC) corrosion of pipelines is very serious in such cases. In this work, laboratory experiments were carried out with an electro-chemical method in a simulated soil solution at various AC current densities from 0 to 200 A/m(2) and AC frequencies from 10 to 200 Hz. Experimental results indicated that with an increase in the AC current density, the corrosion potential of an X60 steel electrode shifted negatively, the anodic current density increased significantly, and the corrosion rate increased. Moreover, with an increase in the AC frequency, the corrosion potential of the X60 electrode shifted positively and the anodic current density decreased, which led to a decrease in the corrosion rate. Furthermore, the morphology of X60 electrodes indicated that uniform corrosion occurred at a low AC current density; while corrosion pits were found on the X60 electrode surface at a high AC current density, and deep corrosion pits seriously damaged the pipelines and might lead to leakage.