IOCAS-IR  > 海洋环境腐蚀与与生物污损重点实验室
Thesis Advisor段继周
Degree Grantor中国科学院大学
Place of Conferral北京
Degree Discipline海洋腐蚀与防护
Keyword碳钢 内锈层 微生物 腐蚀
分别用2216E和PGC从碳钢锈层中分离出21株和13株细菌,并进一步对该锈层中可培养的细菌做了16S rDNA系统发育分析。分析结果表明碳钢锈层中有丰富的微生物类群,其中,无芽孢杆菌属占有最大比例。
Other AbstractAs the economy and society developes, the shortage of energy sources becomes even severer, meanwhile the environment becomes more deteriorative. Being a promising place for human, the ocean is catching unprecedented attention of researchers. The property of seawater is special because of containing high salt, and in this case the material in it can be corroded easily. It cannot be neglected for not only serious waste but also unnecessary disasters occur easily in this environment. Microbes distribute widely in marine environment, and Microbiologically influenced corrosion (MIC) has been an significant part of corrosion that cannot be neglected.
Sulfate-reducing bacteria(SRB), iron bacteria and manganese oxidation bacteria etc. are important species which influence corrosion process of materials. New pattern of the mechanism of MIC can offer necessary theoretical basis for MIC control.
In this study, we try to isolate bacteria from rust layer of steel in natural marine environment, and analyze the diversity of microbes that can be cultivated in it. In addition, study the influence on the corrosion behavior of carbon steel of these isolated species(including aerobic bacteria, iron bacteria and sulfate-reducing bacteria). Conclusions are as follows:
21 bacteria and 13 bacteria were isolated from inner rust layer of carbon steel by 2216E culture medium and PGC medium separately. Phylogenetic analysis of 16S rDNA were conducted and the results indicated that there was high diversity of bacteria in carbon rust layer, and Bacterium accounts the most part.
Weight loss and electrochemical measurements and surfaces analysis were conducted to investigate the influence on the corrosion behavior of carbon steel by these bacterias. The influence on the corrosion behavior of carbon steel by aerobic bacteria is slightly. In a word, they can inhibit corrosion to some extent because of the depletion oxygen on the surface of material and reduce the cathodic depolarization process. Pure sulfate-reducing bacteria accelerate the corrosion rate of carbon steel and pit corrosion occur under biofilms. However, the mixture can inhibit corrosion of carbon steel slightly. Iron bacteria can accelerate the corrosion rate in initial stage of immersion and inhibit corrosion in late stage of immersion.
Document Type学位论文
Recommended Citation
GB/T 7714
刘海霞. 内锈层微生物对碳钢腐蚀行为的影响研究[D]. 北京. 中国科学院大学,2016.
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内锈层微生物对碳钢腐蚀行为的影响研究.p(4798KB)学位论文 开放获取ODC PDDLApplication Full Text
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