方波电流干扰下 X80 钢在模拟土壤溶液中的腐蚀行为

IF 1.1 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Pub Date : 2024-01-09 DOI:10.5006/4388

Liang Dong, Tiansiyu Gan, Qinfeng Song, Yan Qiu, Shaohua Zhang, Yongtao Zhao

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引用次数: 0

摘要

埋地管道受到以地铁为主要泄漏源的动态直流杂散电流干扰，存在加速腐蚀的安全隐患，导致管道失效，不仅造成经济损失，还威胁人身安全。因此，有必要研究管道钢在动态直流干扰下的腐蚀行为。因此，通过质量损失试验、交流阻抗、电路仿真、XRD 和 Pourbaix 图等方法研究了 X80 钢在动态直流干扰下的腐蚀行为。结合 Fe-H2O 体系的腐蚀效率和 Pourbaix 图，提出了法拉第过程中的可逆过程和还原过程机理。通过等效电路计算的电双层模型，分析了非法拉第过程中腐蚀效率减慢的原因。此外，基于上述腐蚀过程，提出了相应的腐蚀机理概念模型。实验结果表明，随着正负半周期干涉时间的不对称和电流密度的增加，X80 钢的腐蚀效率和电流腐蚀效率降低，局部腐蚀加剧。负半周干涉时间的长短会影响金属/溶液界面的电容充放电效应和腐蚀产物的还原反应过程，导致腐蚀减缓和腐蚀效率降低。这也是实验中观察到的腐蚀质量损失比稳态直流减少的重要原因。

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Corrosion behavior of X80 steel in a simulated soil solution under Square Wave Current Interference

The buried pipeline is disturbed by the dynamic DC stray current with the subway as the main leakage source, which has the safety risk of accelerating corrosion, resulting in pipeline failure, which not only causes economic losses but also threatens personal safety. Therefore, it is necessary to study the corrosion behavior of pipeline steel under dynamic DC interference. Therefore, the corrosion behavior of X80 steel under dynamic DC interference were studied by mass loss test, AC impedance, circuit simulation, XRD, and Pourbaix diagram. Combined with the corrosion efficiency and Pourbaix diagram of the Fe-H2O system, the reversible process and reduction process mechanism in the Faraday process are proposed. The reason why the corrosion efficiency slows down in the process of non-Faraday is analyzed by the electric double layer model of equivalent circuit calculation. In addition, based on the above corrosion process, the corresponding conceptual model of the corrosion mechanism is proposed. The experimental results show that with the asymmetry of positive and negative half cycle interference duration and the increase of current density, the corrosion efficiency and current corrosion efficiency of X80 steel decrease, and local corrosion intensifies. The length of negative half cycle interference affects the capacitive charge-discharge effect at the metal/solution interface and the reduction reaction process of corrosion products, resulting in corrosion slowing down and corrosion efficiency reduction. This is also an important reason for the reduction of corrosion mass loss observed in the experiment compared with steady-state DC.

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来源期刊

Corrosion MATERIALS SCIENCE, MULTIDISCIPLINARY-METALLURGY & METALLURGICAL ENGINEERING

CiteScore

2.80

自引率

12.50%

发文量

审稿时长

3 months

期刊介绍： CORROSION is the premier research journal featuring peer-reviewed technical articles from the world’s top researchers and provides a permanent record of progress in the science and technology of corrosion prevention and control. The scope of the journal includes the latest developments in areas of corrosion metallurgy, mechanisms, predictors, cracking (sulfide stress, stress corrosion, hydrogen-induced), passivation, and CO2 corrosion. 70+ years and over 7,100 peer-reviewed articles with advances in corrosion science and engineering have been published in CORROSION. The journal publishes seven article types – original articles, invited critical reviews, technical notes, corrosion communications fast-tracked for rapid publication, special research topic issues, research letters of yearly annual conference student poster sessions, and scientific investigations of field corrosion processes. CORROSION, the Journal of Science and Engineering, serves as an important communication platform for academics, researchers, technical libraries, and universities. Articles considered for CORROSION should have significant permanent value and should accomplish at least one of the following objectives: • Contribute awareness of corrosion phenomena, • Advance understanding of fundamental process, and/or • Further the knowledge of techniques and practices used to reduce corrosion.