磁场对纯Cu微生物腐蚀行为的影响

doi:10.11902/1005.4537.2018.164

中国腐蚀与防护学报

2019, Vol. 39

Issue (6): 484-494 DOI: 10.11902/1005.4537.2018.164

研究报告

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磁场对纯Cu微生物腐蚀行为的影响

卫晓阳^1,²,杨丽景²,吕战鹏¹,郑必长²,宋振纶²(

)

1. 上海大学材料科学与工程学院上海 200072
2. 中国科学院宁波材料技术与工程研究所浙江省海洋材料与防护技术重点实验室;中国科学院海洋新材料与应用技术重点实验室宁波 315201

Influence of Magnetic Field on Corrosion of Pure Cu in Artificial Seawater with Multispecies Aerobic Bacteria

WEI Xiaoyang^1,²,MORADI Masoumeh²,YANG Lijing²,LV Zhanpeng¹,ZHENG Bizhang²,SONG Zhenlun²(

)

1. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
2. Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

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摘要:

从位于中国东海的舟山海域海底沉积物中分离提取得到4种细菌，分别为弧菌、威尼斯不动杆菌、河流弧菌及咸海鲜芽孢杆菌。采用电化学测量和表面分析技术研究了外加磁场下纯Cu在4种混合细菌溶液中的腐蚀行为。结果表明，磁场对细菌生长无明显影响，但影响Cu表面生物膜的结构与成分，加快生物膜形成与剥落的速率，且磁场越大，附着速度越快。随着磁场增大，生物膜中脂质含量减少，生物膜组成由脂质、蛋白质、碳水化合物转变成蛋白质和碳水化合物，且蛋白质含量降低，碳水化合物含量增多。施加磁场，样品在溶液中的R_ct值明显提高，腐蚀电流密度减小，同时表面的点蚀程度减弱，表明磁场可以抑制Cu的微生物腐蚀进程，且磁场强度为60 mT时比28 mT时更能明显抑制Cu的腐蚀。

关键词 ：混合海洋细菌, 磁场, 微生物腐蚀

Abstract：

The effect of static permanent magnetic fields of 28 and 60 mT on the growth rate of marine aerobic bacteria isolated from the East China Sea is studied. The corrosion behavior of pure Cu was also investigated in the artificial seawater with marine aerobic isolated bacteria in the presence of magnetic field by means of electrochemical measurement techniques and surface analysis methods. The formation of biofilm on Cu surface was observed by confocal laser scanning microscopy (CLSM). CLSM images showed that the formation and falling off of the biofilm were accelerated in the presence of magnetic field，while the effect of 60 mT magnetic field was stronger than that of 28 mT. FTIR analysis confirmed that the biofilm structures were changed when magnetic field was introduced to the system, the composition of biofilm changed from lipids, proteins, and carbohydrates to proteins and carbohydrates, while, the amount of protein decreased, but that of the carbohydrate increased. Besides, with the increase of magnetic field intensity, the lipid content decreased. The results of XPS analysis further confirmed that magnetic field affected the nature of corrosion products. The pitting was observed on the Cu surface after removing the formed biofilm using FE-SEM, nevertheless the number and size of pits on the Cu were markedly decreased in the presence of magnetic field. EIS results showed the impedance of pure Cu was significantly increased in the presence of magnetic field. It is concluded that magnetic field could accelerated the formation and falling off of the biofilm by affecting its composition and structure, therewith, inhibit the microbial corrosion process of pure Cu.

Key words： multispecies marine bacteria magnetic field microbiologically-influenced corrosion

收稿日期: 2018-11-07

ZTFLH:

TG172.9

基金资助:宁波市自然科学基金(2018A610211);宁波市十三五海洋经济创新发展示范项目(NBHY-2017-Z2)

通讯作者: 宋振纶 E-mail: songzhenlun@nimte.ac.cn

Corresponding author: Zhenlun SONG E-mail: songzhenlun@nimte.ac.cn

作者简介: 卫晓阳，女，1994年生，硕士生

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引用本文:

卫晓阳,杨丽景,吕战鹏,郑必长,宋振纶. 磁场对纯Cu微生物腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2019, 39(6): 484-494.
Xiaoyang WEI, Masoumeh MORADI, Lijing YANG, Zhanpeng LV, Bizhang ZHENG, Zhenlun SONG. Influence of Magnetic Field on Corrosion of Pure Cu in Artificial Seawater with Multispecies Aerobic Bacteria. Journal of Chinese Society for Corrosion and protection, 2019, 39(6): 484-494.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2018.164 或 https://www.jcscp.org/CN/Y2019/V39/I6/484

图1 有/无磁场条件下细菌的生长曲线

图2 纯Cu在不同磁场强度的含菌溶液中分别浸泡不同时间后的SEM 像

图3 纯Cu在不同磁场强度的含菌溶液中浸泡10 d后去除表面腐蚀产物后的SEM像

图4 纯Cu在不同磁场强度的含菌溶液中浸泡不同时间后的CLSM图

图5 Cu在未施加磁场与施加磁场的溶液中浸泡10 d后表面生物膜的FTIR谱

图6 有/无磁场条件下含菌溶液中浸泡10 d 后铜表面腐蚀产物的XPS分析

表1 纯Cu在有/无磁场条件下的溶液中浸泡10 d后表面腐蚀产物的C、O、N和Cu的XPS光谱的拟合参数

图7 不同磁场条件下Cu在含菌溶液中浸泡10 d后的极化曲线

表2 Cu在未施加磁场和施加磁场的溶液中浸泡10 d后的极化参数

图8 Cu浸泡在不同磁场强度的含菌溶液中的Nyquist图和Bode图

图9 Cu在有/无磁场条件下的溶液中浸泡10 d后EIS拟合所用等效电路

表3 Cu在未施加磁场和施加磁场的溶液中浸泡不同时间后的电化学阻抗谱拟合参数

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