Bacterial distribution in SRB biofilm affects MIC pitting of carbon steel studied using FIB-SEM. (1st May 2020)

• Record Type: Journal Article
• Authors: Li, Yingchao; Feng, Siqiao; Liu, Huamin; Tian, Xiankai; Xia, Yeyin; Li, Mu; Xu, Kai; Yu, Haobo; Liu, Qiaoping; Chen, Changfeng
• Is Part Of: Corrosion science. Volume 167(2020)
• Publication Date: 2020-05-01
• Subjects: FIB-SEM -- Bacterial distribution -- Ion selectivity -- MIC pitting -- SRB consortium; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2020.108512
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: The bacterial distribution in the biofilm varied depending on the corrosion morphology. The biofilm has an anion selectivity. MIC pitting mechanism was proposed considering the bacterial distribution and the biofilm ion selectivity. Abstract: The bacterial distribution in biofilm and the longitudinal element distribution of MIC pitting by an SRB consortium were investigated using focused ion beam-scanning electron microscope (FIB-SEM). Results show that bacteria were surrounded by shells, and the bacterial distribution in the biofilm varied depending on the corrosion morphology. At the pitting corrosion area, cells gathered at the bottom of biofilm, while at the general corrosion area, cells distributed at the outer side of biofilm. The membrane potential measurement result shows that the biofilm has an anion selectivity. MIC pitting mechanism was proposed considering the bacterial distribution and the biofilm ion selectivity.