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微生物致裂的热力学和动力学分析
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  • 英文篇名:Thermodynamic and Dynamic Analyses of Microbiologically Assisted Cracking
  • 作者:吴堂清 ; 周昭芬 ; 王鑫铭 ; 张德闯 ; 尹付成 ; 孙成
  • 英文作者:WU Tangqing;ZHOU Zhaofen;WANG Xinming;ZHANG Dechuang;YIN Fucheng;SUN Cheng;Key Laboratory of Materials Design and Preparation Technology of Hunan Province, Xiangtan University;School of Materials Science and Engineering, Xiangtan University;Environmental Corrosion Center, Institute of Metal Research, Chinese Academy of Sciences;
  • 关键词:热力学 ; 微生物腐蚀 ; 硫酸盐还原菌 ; 硝酸盐还原菌
  • 英文关键词:thermodynamics;;microbiologically induced corrosion;;sulfate-reducing bacteria;;nitrate reducing bacteria
  • 中文刊名:ZGFF
  • 英文刊名:Journal of Chinese Society for Corrosion and Protection
  • 机构:湘潭大学材料设计及制备技术湖南省重点实验室;湘潭大学材料科学与工程学院;中国科学院金属研究所材料环境腐蚀研究中心;
  • 出版日期:2019-06-15
  • 出版单位:中国腐蚀与防护学报
  • 年:2019
  • 期:v.39
  • 基金:国家自然科学基金(51601164和51871228);; 湖南省自然科学基金(2019JJ30023);; 中国博士后科学基金(2018T110836)~~
  • 语种:中文;
  • 页:ZGFF201903003
  • 页数:8
  • CN:03
  • ISSN:21-1474/TG
  • 分类号:29-36
摘要
现场调查和实验研究均证实了微生物致裂的存在并提出了合理的机理模型,但是缺乏微生物致裂的热力学和动力学理论分析。基于Gutman的力学-化学交互作用理论、微生物能量学和腐蚀电化学理论,本文尝试给出SRB/NRB致裂的热力学和动力学解释。热力学计算结果表明,应力和SRB/NRB共同作用下金属材料腐蚀反应的摩尔Gibbs自由能下降,腐蚀反应向环境释放出更多的热量,从热力学上来说具有更高的腐蚀趋势。与SRB腐蚀和SRB致裂相比,铁基金属材料NRB腐蚀和NRB致裂具有更强的热力学倾向。动力学分析表明,外加应力和微生物共同作用下金属材料腐蚀速率和微裂纹扩展速率加快。本工作的研究结果能丰富人们对金属材料菌致开裂行为的认识。
        Microbiologically influenced corrosion(MIC) is one of the most common corrosion types of buried pipelines. Many investigations in field survey and laboratory simulation studies have verified that microorganisms in soil and applied stresses can synergistically participate in and significantly affect the crack initiation and propagation of pipeline steels. This phenomenon was named as"microbiologically assisted cracking(MAC)". Relevant mechanisms, such as pitting mechanism, hydrogen damage mechanism, have been proposed to illuminate this phenomenon. However, there is still a lack of thermodynamic interpretation of MAC and the dynamic analysis deriving from thermodynamic interpretation. In the paper, the thermodynamic interpretation and the dynamic analysis for sulfate reducing bacteria(SRB)/nitrate-reducing bacteria(NRB)-assisted cracking were proposed based on the mechano-chemical interaction theory, bioenergetics and corrosion electrochemistry. The thermodynamic results showed that under the combined actions of SRB/NRB and external stress, the changes of Gibbs free energy of the corrosion reactions decrease and the releasing energies increase accordingly, revealing the stronger corrosion tendency in thermodynamics. For Fe-based alloys, NRB corrosion and NRB-assisted cracking are the more thermodynamically favorable processes, as compared to SRB corrosion and SRB-assisted cracking, respectively. The dynamic results showed that the corrosion rate and the crack propagation rate increase under the combined actions of applied stresses and microorganisms.
引文
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