Microbiologically influenced corrosion of C1018 carbon steel by nitrate reducing Pseudomonas aeruginosa biofilm under organic carbon starvation

[Display omitted] •Pseudomonas aeruginosa corrosion mechanism can be explained using bioenergetics.•Starved P. aeruginosa biofilm is more corrosive than in full medium.•P. aeruginosa biofilm is grown to maturity before starvation starts.•Experimental data support the biocatalytic cathodic nitrate re...

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Bibliographic Details
Published in:Corrosion science 2017-10, Vol.127, p.1-9
Main Authors: Jia, Ru, Yang, Dongqing, Xu, Jin, Xu, Dake, Gu, Tingyue
Format: Article
Language:English
Subjects:
A. Carbon steel
B. EIS
B. SEM
B. Weight loss
Biofilms
C. Microbiological corrosion
C. Pitting corrosion
Carbon steel
Carbon steels
Corrosion
Corrosion resistance
Electrochemical impedance spectroscopy
Gram-negative bacteria
Linear polarization
Microbiology
Nitrates
Pitting (corrosion)
Pseudomonas aeruginosa
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Summary:[Display omitted] •Pseudomonas aeruginosa corrosion mechanism can be explained using bioenergetics.•Starved P. aeruginosa biofilm is more corrosive than in full medium.•P. aeruginosa biofilm is grown to maturity before starvation starts.•Experimental data support the biocatalytic cathodic nitrate reduction theory. This work showed that a wild-type Pseudomonas aeruginosa (PAO1) grown as a nitrate reducing bacterium biofilm on C1018 carbon steel was more corrosive under organic carbon source starvation. P. aeruginosa biofilms were pre-grown for 2days to achieve maturity before the culture media were changed to fresh culture media with 100% (as in the standard medium), 10%, and 0% organic carbons for subsequent 7-day incubation. Biofilms with 100%, 10%, and 0% organic carbons caused maximum pit depths of 5.4μm, 10.6μm, and 17.0μm, respectively. Weight loss, linear polarization resistance and electrochemical impedance spectroscopy data corroborated the pitting data.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2017.08.007