Study of biofilm-influenced corrosion on X80 pipeline steel by a nitrate-reducing bacterium, Bacillus cereus, in artificial Beijing soil

Bo Liu; Meihui Sun; Fangyuan Lu; Cuiwei Du; Xiaogang Li

doi:10.1016/j.colsurfb.2020.111356

Study of biofilm-influenced corrosion on X80 pipeline steel by a nitrate-reducing bacterium, Bacillus cereus, in artificial Beijing soil

Colloids Surf B Biointerfaces. 2021 Jan:197:111356. doi: 10.1016/j.colsurfb.2020.111356. Epub 2020 Sep 19.

Authors

Bo Liu¹, Meihui Sun¹, Fangyuan Lu¹, Cuiwei Du², Xiaogang Li³

Affiliations

¹ Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China; Key Laboratory for Corrosion and Protection of Ministry of Education (MOE), Beijing, 100083, China.
² Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China; Key Laboratory for Corrosion and Protection of Ministry of Education (MOE), Beijing, 100083, China; Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing, 100083, China; National Materials Corrosion and Protection Scientific Data Center, Institute of Advanced Materials and Technology, Beijing, 100083, China. Electronic address: dcw@ustb.edu.cn.
³ Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China; Key Laboratory for Corrosion and Protection of Ministry of Education (MOE), Beijing, 100083, China; Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing, 100083, China; National Materials Corrosion and Protection Scientific Data Center, Institute of Advanced Materials and Technology, Beijing, 100083, China.

PMID: 33007505
DOI: 10.1016/j.colsurfb.2020.111356

Abstract

The biofilm of Bacillus cereus on the surface of X80 pipeline steel was investigated from forming to shedding. Based on the observed biofilm morphology and pit analysis, it was found that B. cereus biofilm could stimulate X80 pipeline steel pitting corrosion, which was attributed to the nitrate reduction of bacteria beneath the biofilm. Electrochemical measurements and general corrosion rate results showed that B. cereus biofilm can better accelerate X80 pipeline steel corrosion compared to sterile solutions. Interestingly, the results also showed that thick biofilms had a slight tendency to inhibit the general corrosion process compared with its formation and exfoliation, which was confirmed by scanning Kelvin probe. The corrosion rate of X80 pipeline steel in artificial Beijing soil is closely related to the state of the biofilm, and nitrate reducing bacteria accelerates the occurrence of pits. The corresponding corrosion mechanisms are proposed.

Keywords: Biological cathode; Heterogeneous biofilm; Soil environment; X80 pipeline steel.

MeSH terms

Bacillus cereus*
Beijing
Biofilms
Corrosion
Nitrates
Soil
Steel*

Substances

Nitrates
Soil
Steel