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中国腐蚀与防护学报  2018, Vol. 38 Issue (1): 10-17    DOI: 10.11902/1005.4537.2017.009
  研究报告 本期目录 | 过刊浏览 |
酸性土壤环境中Q235钢的微生物腐蚀行为
于利宝1,2, 闫茂成1(), 王彬彬3, 舒韵1, 许进1, 孙成1
1 中国科学院金属研究所 沈阳 110016
2 中国科学院大学 北京 100049
3 中国石油西南管道公司 成都 610041
Microbial Corrosion of Q235 Steel in Acidic Red Soil Environment
Libao YU1,2, Maocheng YAN1(), Binbin WANG3, Yun SHU1, Jin XU1, Cheng SUN1
1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 PetroChina West Pipeline Company, Chengdou 610041, China
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摘要: 

采用电化学阻抗谱 (EIS)、极化电位扫描等电化学技术和微观形貌观察方法研究含硫酸盐还原菌 (SRB) 的酸性红壤环境中Q235钢的微生物腐蚀 (MIC) 行为及对应电化学过程特征。结果表明：酸性红壤环境中,前4 d为环境适应期,期间SRB细菌数量减少,SRB对腐蚀电化学过程没有显著影响;生长期中SRB促使Q235钢的自腐蚀电位和极化电阻降低,腐蚀速率增大;EIS极化电阻测试结果表明,有菌红壤中腐蚀速率约为无菌红壤中的2倍。SRB呼吸代谢活动可与红壤颗粒表层FeOOH等铁氧化物作用,引起FeOOH的微生物异化还原,促进Q235钢的腐蚀电化学过程。
关键词 ： 土壤腐蚀,  硫酸盐还原菌,  红壤,  管道,  电子转移    
Abstract：

Microbial corrosion induced by sulphate-reducing bacteria (SRB) for carbon steel Q235 beneath coating defects was studied by means of electrochemical impedance spectroscopy (EIS), polarization measurement and microscopic surface observation. Results showed that, in acid red soil environment, SRB have no significant effect on the electrochemical process during the initial environmental adaptation period. Then in the next period, the respiratory metabolic activities of the growing SRB lead to decrease of the free corrosion potential of Q235 steel and accelerate corrosion process of the carbon steel. Bacteria can react with iron oxides in the red soil, causing microbial dissimilatory reduction of iron oxides, which promotes electrochemical corrosion process of the carbon steel.
Key words： soil corrosion    sulphate-reducing bacteria    acid soil    pipeline    electron charge transfer
收稿日期: 2017-01-14     
ZTFLH:  TG172.4  
基金资助:国家科技基础条件平台-国家材料环境腐蚀平台项目 (2005DKA10400) 和中国科学院A类战略性先导科技专项 (XDA13040500)
作者简介:

作者简介 于利宝,男,1990年生,硕士生
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于利宝
闫茂成
王彬彬
舒韵
许进
孙成

引用本文:

于利宝, 闫茂成, 王彬彬, 舒韵, 许进, 孙成. 酸性土壤环境中Q235钢的微生物腐蚀行为[J]. 中国腐蚀与防护学报, 2018, 38(1): 10-17.
Libao YU, Maocheng YAN, Binbin WANG, Yun SHU, Jin XU, Cheng SUN. Microbial Corrosion of Q235 Steel in Acidic Red Soil Environment. Journal of Chinese Society for Corrosion and protection, 2018, 38(1): 10-17.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.009      或      https://www.jcscp.org/CN/Y2018/V38/I1/10

图1  硫酸盐还原菌数量随时间的变化曲线
图2  Q235钢在灭菌和接菌水饱和红壤中暴露20 d后的SEM形貌
图3  Q235钢在灭菌和接菌水饱和红壤中暴露20 d后表面的激光共聚焦形貌比较
图4  灭菌和接菌红壤中Q235钢开路电位随时间的变化曲线
图5  Q235钢在灭菌红壤中包埋不同时间的阻抗谱
图6  Q235钢在接菌红壤中包埋不同时间的阻抗谱
图7  EIS数据拟合的等效电路模型
Time / d Rs / Ωcm2 Yf / Ssncm-2 nf Rf / kΩcm2 Ydl / Ssncm-2 ndl Rct / kΩcm2
Sterile soil
1 588.8 7.123×10-5 0.8335 0.3075 1.517×10-4 0.8770 2.366
3 561.1 8.340×10-5 0.7542 1.070 1.237×10-4 0.9127 4.808
5 624.8 7.274×10-5 0.6603 2.538 1.304×10-4 0.9379 6.498
10 605.8 8.173×10-5 0.7129 2.588 1.824×10-4 0.9661 5.579
15 608.9 9.339×10-5 0.6726 3.225 2.028×10-4 0.9763 6.311
20 609.9 8.671×10-5 0.7065 3.353 2.403×10-4 0.9830 6.547
SRB inoculated soil
1 403.1 7.729×10-5 0.8359 0.2622 1.465×10-4 0.8583 2.425
3 401.5 8.382×10-5 0.7572 0.9095 1.116×10-4 0.8920 3.650
5 691.9 1.289×10-4 0.6731 1.128 3.962×10-4 0.6285 3.764
10 693.8 1.635×10-4 0.6318 1.625 3.752×10-4 0.7712 3.376
15 709.9 1.796×10-4 0.6108 2.284 3.526×10-4 0.9264 3.445
20 717.8 1.743×10-4 0.5998 2.635 3.425×10-4 0.9493 3.461
表1  灭菌和接菌土红壤中EIS拟合结果
图8  灭菌和接菌红壤中Q235钢极化电阻Rp和Rp-1随时间的变化规律
图9  玻碳电极在灭菌和接菌红壤中包埋10 d后的循环伏安曲线
图10  Q235钢在灭菌和接菌红壤中包埋10 d后的极化曲线
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