土壤优势放线菌菌群对紫铜的腐蚀

doi:10.11902/1005.4537.2015.016

中国腐蚀与防护学报

2015, Vol. 35

Issue (4): 345-352 DOI: 10.11902/1005.4537.2015.016

本期目录 | 过刊浏览

土壤优势放线菌菌群对紫铜的腐蚀

李波^1,²,罗学刚²(

),唐永金^1,²,李梓番^1,²,杨圣^1,²,焦扬^1,²

2. 西南科技大学生物质材料教育部工程研究中心绵阳 621010

Corrosion Behavior of the Dominant Actinomycetes in Soil on Copper

Bo LI^1,²,Xuegang LUO²(

),Yongjin TANG^1,²,Zifan LI^1,²,Sheng YANG^1,²,Yang JIAO^1,²

1. College of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
2. Engineering Research Center of Biomass Materials, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China

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摘要:

采用微生物学、表面分析技术和电化学方法研究了从高放废物处置预选区土壤中分离的放线菌菌群对紫铜的腐蚀行为。结果表明：添加高浓度培养基可以维持菌群一定周期内的持续活性；SEM及EDS结果表明,浸泡9 d时放线菌菌群在紫铜表面形成完整的生物膜,腐蚀产物主要为Cu的氢氧化物；实验前期活性生物膜抑制紫铜腐蚀,后期菌群的活动改变了紫铜表面双电层的结构及性质,加速腐蚀进程。

关键词 ：紫铜, 放线菌菌群, 扫描电镜, 电化学

Abstract：

The corrosion behavior of copper in culture medium inoculated with dominant actinomycetes is studied by means of microbiological test, surface analysis and electrochemical measurement method. The dominant actinomycetes are separated from the soil of Beishan in Gansu province, where is one of the preselected areas for high-level radioactive waste repository. The results show that the sustain activity of actinomycetes in a certain period could be maintained by adding high concentration culture medium for 2, 9 and 30 d after corrosion. The biofilm caused by actinomycetes is completely formed on the surface of copper after corrosion for 9 d and the hydroxide products of copper serve as the main corrosion products. The active biofilm inhibits the corrosion process of copper in the early stage, however in the later stage, while the enhanced activity of actinomycetes changes the structure and character of the double electric layer on the copper surface, thereby increases the corrosion rate and promotes the formation of corrosion pits.

Key words： copper actinomycetes scanning electron microscope electrochemistry

基金资助:国家核设施退役及放射性废物治理科研项目 (12ZG6104)资助

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引用本文:

李波,罗学刚,唐永金,李梓番,杨圣,焦扬. 土壤优势放线菌菌群对紫铜的腐蚀[J]. 中国腐蚀与防护学报, 2015, 35(4): 345-352.
Bo LI, Xuegang LUO, Yongjin TANG, Zifan LI, Sheng YANG, Yang JIAO. Corrosion Behavior of the Dominant Actinomycetes in Soil on Copper. Journal of Chinese Society for Corrosion and protection, 2015, 35(4): 345-352.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.016 或 https://www.jcscp.org/CN/Y2015/V35/I4/345

图1 放线菌菌群活菌数随时间的变化曲线

图2 紫铜在无菌与有菌培养基中浸泡9 d后的腐蚀形貌及EDS结果

图3 紫铜在无菌与有菌培养基中浸泡60 d后的腐蚀形貌及EDS结果

表1 浸泡不同时间的紫铜的极化曲线参数

图4 浸泡不同时间无菌和有菌培养基中紫铜的极化曲线

图5 无菌和有菌培养基中紫铜腐蚀电流密度随时间的变化曲线

图6 无菌和有菌培养基中紫铜腐蚀速率随时间的变化曲线

图7 浸泡不同时间无菌和有菌培养基中紫铜的EIS谱

图8 用于阻抗谱拟合的等效电路模型

表2 无菌培养基中EIS拟合结果

表3 有菌培养基中EIS拟合结果

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