远青弧菌、硫酸盐还原菌及其混合菌种作用下 B10合金的海水腐蚀行为

doi:10.11900/0412.1961.2014.00204

金属学报

2014, Vol. 50

Issue (12): 1461-1470 DOI: 10.11900/0412.1961.2014.00204

本期目录 | 过刊浏览

远青弧菌、硫酸盐还原菌及其混合菌种作用下 B10合金的海水腐蚀行为

魏仁超^1,², 许凤玲², 蔺存国², 唐晓³, 李焰³(

)

1 中国石油大学(华东)化学工程学院, 青岛 266580
2 中国船舶重工集团公司第725研究所海洋腐蚀与防护国家级重点实验室, 青岛 266071
3 中国石油大学(华东)机电工程学院, 青岛 266580

CORROSION BEHAVIOR OF B10 ALLOY EXPOSED TO SEAWATER CONTAINING VIBRIO AZUREUS, SULFATE-REDUCING BACTERIA, AND THEIR MIXTURE

WEI Renchao^1,², XU Fengling², LIN Cunguo², TANG Xiao³, LI Yan³(

)

1 College of Chemical Engineering, China University of Petroleum, Qingdao 266580
2 State key Laboratory for Marine Corrosion and Protection of Luoyang Ship Material Research Institute, Qingdao 266071
3 College of Mechanical and Electrical Engineering, China University of Petroleum, Qingdao 266580

引用本文:

魏仁超, 许凤玲, 蔺存国, 唐晓, 李焰. 远青弧菌、硫酸盐还原菌及其混合菌种作用下 B10合金的海水腐蚀行为[J]. 金属学报, 2014, 50(12): 1461-1470.
Renchao WEI, Fengling XU, Cunguo LIN, Xiao TANG, Yan LI. CORROSION BEHAVIOR OF B10 ALLOY EXPOSED TO SEAWATER CONTAINING VIBRIO AZUREUS, SULFATE-REDUCING BACTERIA, AND THEIR MIXTURE[J]. Acta Metall Sin, 2014, 50(12): 1461-1470.

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摘要:

采用电化学实验及SEM和EDS分析技术, 研究了B10合金分别在无菌和接种了远青弧菌、硫酸盐还原菌(SRB)以及二者混合菌种的海水中的腐蚀行为. 结果表明, 不同海洋微生物条件下B10合金的腐蚀行为及机制有所不同. 远青弧菌通过阻滞氧去极化阴极过程在一定程度上抑制B10合金腐蚀; SRB则通过氢去极化使阳极溶解加速, 而生成的粗大颗粒状腐蚀产物Cu₂S对基体的保护性不佳, 促进了B10合金的腐蚀; 而在混合菌种条件下, B10合金腐蚀的阴极过程与仅接种SRB时相似, 但阳极溶解形成的腐蚀产物比后者细小且致密均匀, 使其阳极极化显著增大, 阻滞了试样的进一步腐蚀, 其腐蚀电流密度介于2种单一菌种之间. 因此在工程实践中, 根据实验室单一菌种条件下材料的腐蚀行为来估计和预测在实际微生物环境中材料的腐蚀行为时宜慎重.

关键词 ：硫酸盐还原菌, 远青弧菌, 电化学阻抗谱, B10合金

Abstract：

With increasing attention paid to the security issues of onshore engineering structure, corrosion researches of copper alloy were focused on the influence of single bacteria, especially the anaerobic sulfate-reducing bacteria (SRB). However, a part of documents indicated that comprehensive influence of natural bacteria on the copper alloy does exist, and whether the influence of single bacteria could represent the real impact of natural complex bacteria is remaining unclear. Under this consideration, electrochemical measurements, incorporated with surface morphology and composition analysis, were employed to investigate the corrosion behavior of B10 alloy in seawater which was inoculated into Vibrio azureus, SRB and their mixed strains, respectively, in this work. The results showed that these marine micro-organisms could affect the corrosion process of B10 alloy in relatively different ways. Compared with the sterile condition, Vibrio azureus could inhabit the corrosion of B10 alloy to some extent by blocking cathodic oxygen reducing process, while SRB could significantly promote its corrosion by accelerating anodic dissolution of B10 alloy via hydrogen depolarization and forming loose and bulky corrosion products without complete protection. In the mixed microbial medium, SRB multiply rapidly in the local anaerobic environment created by the biological membrane of Vibrio azureus, their interacting changed the corrosive micro-environment on the surface of B10 alloy. The smaller and complicated corrosion products formed in the seawater containing mixed strains obviously performed better than that produced in the medium containing SRB only, giving rise to a significant increase in anodic polarization; at the same time, similar cathodic process was still occurred in the mixed culture. As a result, the corrosion current density of B10 alloy fell in between those detected in two single microbial media. For the practice engineering applications, therefore, the conclusions drawn from single microbe medium should be cautiously and carefully adopted as the criterion to evaluate corrosion behavior of B10 alloy in actual microbial environment.

Key words： sulfate-reducing bacteria Vibrio azureus electrochemical impedance spectroscopy B10 alloy

ZTFLH:

TG178

基金资助:* 国家自然科学基金重点项目51131008和中国石油大学(华东)创新工程项目CX-1221资助

作者简介: null

魏仁超, 女, 1990年生, 博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2014.00204 或 https://www.ams.org.cn/CN/Y2014/V50/I12/1461

图1 B10合金在4种介质中的开路电位随时间的变化

图2 B10合金在灭菌海水中浸泡不同时间的Nyquist图及Bode图

图3 B10合金在接种远青弧菌的灭菌海水中浸泡不同时间的Nyquist图及Bode图

图4 B10合金在接种SRB的灭菌海水中浸泡不同时间的Nyquist图及Bode图

图5 在灭菌海水中接种混合菌种中B10合金的Nyquist图及Bode图

表1 B10合金在4种腐蚀介质中的EIS解析参数

图6 B10合金在4种不同介质中浸泡12 d的极化曲线

表2 B10合金在4种不同介质中的极化曲线拟合参数

图7 B10合金在腐蚀介质中浸泡12 d后的腐蚀形貌及选区EDS

表3 图7中B10合金表面选区EDS分析结果

图8 3种微生物介质条件下B10合金的腐蚀示意图

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