直流电场对X80钢在硫酸盐还原菌体系中腐蚀行为的影响

doi:10.11896/cldb.24070129

材料导报

2025, Vol. 39

Issue (15): 24070129-9 https://doi.org/10.11896/cldb.24070129

金属与金属基复合材料

直流电场对X80钢在硫酸盐还原菌体系中腐蚀行为的影响

张雅妮^1,*, 段博文¹, 宋伟¹, 张成鑫¹, 樊冰², 王思敏³

1 西安石油大学材料科学与工程学院,西安 710065
2 中国石油集团工程材料研究院有限公司,西安 710077
3 首钢集团长治钢铁有限公司,山西长治 046031

Effect of DC Electric Field on the Corrosion Behavior of X80 Steel in Sulfate-reducing Bacteria System

ZHANG Yani^1,*, DUAN Bowen¹, SONG Wei¹, ZHANG Chengxin¹, FAN Bing², WANG Simin³

1 School of Materials Science and Engineering, University of Xi'an Shiyou, Xi'an 710065, China
2 China National Petroleum Engineering Materials Research Institute Co., Ltd., Xi'an 710077, China
3 Shougang Group Changzhi Iron and Steel Co., Ltd., Changzhi 046031, Shanxi, China

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摘要随着高压输电线路、轨道交通、油气管道共用公共交通走廊,电场环境必然会对硫酸盐还原菌(SRB)腐蚀行为产生影响。本工作通过生物培养技术、浸泡实验、电化学等实验方法,结合Na₂S₂O₃滴定技术、扫描电镜(SEM)、X射线光电子能谱(XPS)、激光共聚焦等分析手段,研究了直流电场对硫酸盐还原菌环境中X80管线钢腐蚀行为的影响,包含SRB数量的变化、硫离子含量和价态的变化、表面生物膜的特征、腐蚀速率及电化学过程特征。结果表明:弱电场促进了SRB的生长,延长了SRB的生命周期,有利于基体表层致密膜层的形成,阻碍了腐蚀性离子的侵蚀;强电场抑制了SRB的生长,缩短了SRB的生命周期,并且在强电场的作用下膜层疏松多孔。同时外加电场改变了膜层中S元素的赋存方式,强电场环境削弱了S元素由氧化态(S⁶⁺)向还原态(S^2-)的转变。在0～1 200 V/m的测试范围内,电场强度为500 V/m时S^2-的含量最高,产物膜最完整致密,腐蚀速率最小;在电场强度为1 200 V/m时,S^2-含量最低。强电场作用加速了腐蚀性离子和电子的定向迁移,导致X80钢具有最大的失重速率和点蚀速率。

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	张雅妮
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	王思敏

关键词: 硫酸盐还原菌电场 X80 生物膜 S离子价态点蚀

Abstract: As high-voltage transmission lines, rail transit, and oil and gas pipelines share public transportation corridor, the produced electric field envi-ronment has an inevitable influence on the corrosion behavior of sulfate-reducing bacteria (SRB). In this work, the effect of DC electric field on the corrosion behavior of X80 pipeline steel in the sulfate-reducing bacteria environment was investigated. The SRB quantity, the concentration and valence state of sulfide ions, the characteristics of surface biofilm, corrosion rate and electrochemical process, were analyzed by biological culture technology, immersion experiment, electrochemistry and other experimental methods, combined with Na₂S₂O₃ titration technology, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), laser confocal and other analytical methods. The findings show that low voltage applied DC field promotes the growth of SRB, prolongs the life cycle of SRB, facilitates the formation of dense film layer on the surface of the matrix, and further hinders the attack of corrosive ions. While the high voltage applied DC field inhibits the growth of SRB, shortens the life cycle of SRB, and results in the film layer loose and porous. Meanwhile, the applied DC electric field changed the valency state of S element in film, high voltage applied DC field inhibits the S transformation from oxidation state (S⁶⁺) to reduction state (S^2-). The dense film with the hig-hest S^2- content and the lowest substrate corrosion rate can be obtained by applying a voltage of 500 V/m in the tested DC electric field voltage range within 0 —1 200 V/m. When the applied DC field voltage is 1 200 V/m, the content of S^2- is the lowest in the dense film. The directional migration of corrosive ions and electrons is accelerated strongly by higher field strength, and the X80 steel has the highest uniform corrosion rate and pitting corrosion rate.

Key words: sulfate-reducing bacteria electric field X80 biofilm S-ion valence pitting

出版日期: 2025-08-10 发布日期: 2025-08-13

ZTFLH:

TG172

基金资助: 国家自然科学基金(52401111);陕西省自然科学基础研究计划项目(2024JC-YBQN-0457);西安市科技计划项目(24GXFW0075)

通讯作者: 张雅妮,博士,西安石油大学材料科学与工程学院副教授、硕士研究生导师。目前主要从事金属材料的腐蚀与防护、石油器件的失效分析等研究工作。zhangyn@xsyu.edu.cn

引用本文:

张雅妮, 段博文, 宋伟, 张成鑫, 樊冰, 王思敏. 直流电场对X80钢在硫酸盐还原菌体系中腐蚀行为的影响[J]. 材料导报, 2025, 39(15): 24070129-9.
ZHANG Yani, DUAN Bowen, SONG Wei, ZHANG Chengxin, FAN Bing, WANG Simin. Effect of DC Electric Field on the Corrosion Behavior of X80 Steel in Sulfate-reducing Bacteria System. Materials Reports, 2025, 39(15): 24070129-9.

链接本文:

https://www.mater-rep.com/CN/10.11896/cldb.24070129 或 https://www.mater-rep.com/CN/Y2025/V39/I15/24070129

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