Corrosion Kinetics and Prediction Modeling of X70 Steel Under Dynamic DC Interference

IF 1.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials and Corrosion-werkstoffe Und Korrosion Pub Date : 2025-01-19 DOI:10.1002/maco.202414679

Xiang Li, Jun Wang, Wenbin Qian, Haohao Xu, Yanxia Du, Rujiao Duan, Jianguo Liu, Gan Cui

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Abstract

Through comprehensive electrochemical and corrosion rate testing, this study elucidates the dynamic changes in the impedance spectrum and corrosion rate of X70 steel subjected to dynamic direct current (DC) interference. An equivalent circuit model was developed to represent the system under dynamic DC conditions, and the current components within the electrode system were calculated using circuit theory. This analysis allowed for the determination of the non-Faraday process contribution, thus clarifying its impact mechanism and the overall corrosion mechanism under dynamic DC interference. The findings indicate that non-Faraday processes play a crucial role in dynamic DC interference scenarios, with non-Faraday current increasing proportionally to the amplitude of the interference potential while Faraday efficiency remains unchanged. Furthermore, as the frequency of the interference potential increases, non-Faraday current increases and Faraday efficiency decreases. Positive biasing of the interference potential maintains constant non-Faraday current but enhances Faraday efficiency.

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X70钢在动态直流干扰下的腐蚀动力学及预测模型

本研究通过综合电化学和腐蚀速率测试，阐明了X70钢在动态直流干扰下的阻抗谱和腐蚀速率的动态变化。建立了动态直流条件下的等效电路模型，利用电路理论计算了电极系统内的电流分量。该分析可以确定非法拉第过程的贡献，从而阐明其影响机制和动态直流干扰下的整体腐蚀机制。研究结果表明，非法拉第过程在动态直流干扰场景中起着至关重要的作用，非法拉第电流与干扰电位的幅度成比例地增加，而法拉第效率保持不变。此外，随着干扰电位频率的增加，非法拉第电流增大，法拉第效率降低。干涉电位的正偏置保持了恒定的非法拉第电流，但提高了法拉第效率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials and Corrosion-werkstoffe Und Korrosion 工程技术-材料科学：综合

CiteScore

3.70

自引率

11.10%

发文量

199

审稿时长

1.4 months

期刊介绍： Materials and Corrosion is the leading European journal in its field, providing rapid and comprehensive coverage of the subject and specifically highlighting the increasing importance of corrosion research and prevention. Several sections exclusive to Materials and Corrosion bring you closer to the current events in the field of corrosion research and add to the impact this journal can make on your work.