海水环境中组合电位极化对铁氧化菌腐蚀的影响

doi:10.11902/1005.4537.2021.106

中国腐蚀与防护学报

2022, Vol. 42

Issue (2): 211-217 DOI: 10.11902/1005.4537.2021.106

研究报告

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海水环境中组合电位极化对铁氧化菌腐蚀的影响

李振欣, 吕美英, 杜敏(

)

中国海洋大学化学化工学院海洋化学理论与工程技术教育部重点实验室青岛 266100

Effect of Combined Potential Polarization on Corrosion of X65 Steel in Seawater Inoculated with Iron Oxiding Bacteria

LI Zhenxin, LV Meiying, DU Min(

)

Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China

全文: PDF(9692 KB) HTML

摘要:

采用电化学测试、扫描电镜、激光共聚焦显微镜、Raman光谱等手段研究了-850 mV (vs. SCE，下同) 转-1050 mV和-1050 mV转-850 mV组合电位阴极极化对X65钢在含铁氧化菌 (IOB) 的海水中腐蚀的影响。结果表明：两种组合电位极化都对IOB腐蚀有一定抑制作用；极化与开路电位下X65钢腐蚀产物种类差别不大，含量有区别。-1050 mV极化可以抑制IOB附着但不能完全去除已形成的生物膜，这是-1050 mV转-850 mV极化保护效果优于-850 mV转-1050 mV极化的原因。

关键词 ：微生物腐蚀, 铁氧化菌, 组合电位阴极极化, 海水环境, 附着

Abstract：

The effect of stepwise cathodic polarizations with two potentials: either -850 mV (vs. SCE) then -1050 mV or -1050 mV then -850 mV on the corrosion behavior of X65 steel in the aged Qingdao seawater inoculated with iron oxidizing bacteria was studied by means of electrochemical techniques, scanning electron microscopy and confocal laser scanning microscopy and Raman spectroscopy. The results show that both of the two stepwise polarizations all can inhibit the IOB induced corrosion. There is little difference in the composition but variation in the content of each constituent of corrosion products formed on X65 steel in the aged Qingdao seawater inoculated with iron oxidizing bacteria by open circuit potential as well as by applying either of the two stepwise polarizations respectively. The polarization by -1050 mV can inhibit IOB adhesion, but cannot completely remove the formed biofilm, which may be the reason why the stepwise polarization by -1050 mV then -850 mV has better protection effect than that by -850 mV then -1050 mV.

Key words： microbiologically influenced corrosion iron-oxidizing bacteria combined potential cathodic polarization seawater environment adhering

收稿日期: 2021-05-12

ZTFLH:

Q939.98

基金资助:国家自然科学基金(51871204)

通讯作者: 杜敏 E-mail: ssdm99@ouc.edu.cn

Corresponding author: DU Min E-mail: ssdm99@ouc.edu.cn

作者简介: 李振欣，男，1995年生，硕士生

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引用本文:

李振欣, 吕美英, 杜敏. 海水环境中组合电位极化对铁氧化菌腐蚀的影响[J]. 中国腐蚀与防护学报, 2022, 42(2): 211-217.
Zhenxin LI, Meiying LV, Min DU. Effect of Combined Potential Polarization on Corrosion of X65 Steel in Seawater Inoculated with Iron Oxiding Bacteria. Journal of Chinese Society for Corrosion and protection, 2022, 42(2): 211-217.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.106 或 https://www.jcscp.org/CN/Y2022/V42/I2/211

图1 海水环境中铁氧化菌的生长曲线

图2 不同阴极电位下3 d时溶液中IOB数量

图3 不同组合电位下浸泡7 d后X65钢表面形貌图

图4 不同阴极电位下极化7 d后去除试样表面腐蚀产物后基底形貌

表1 X65钢在不同阴极电位下极化7 d后去除腐蚀产物的激光共聚焦显微镜测量数据

图5 不同阴极电位下极化7 d后X65钢表面Raman谱图

图6 不同阴极电位下极化不同时间后X65钢的电化学阻抗图

图7 电化学阻抗谱拟合等效电路图

图8 电化学阻抗谱拟合参数随时间变化曲线

图9 不同阴极电位下X65钢表面状态图

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