Electroactive Bacteria Associated With Stainless Steel Ennoblement in Seawater

Frontiers in Microbiology
Florian TrigodetLoïs Maignien

Abstract

Microorganisms can increase the open-circuit potential of stainless steel immersed in seawater of several hundred millivolts in a phenomenon called ennoblement. It raises the chance of corrosion as the open-circuit potential may go over the pitting corrosion potential. Despite the large impact of the ennoblement, no unifying mechanisms have been described as responsible for the phenomenon. Here we show that the strict electrotroph bacterium "Candidatus Tenderia electrophaga" is detected as an ennoblement biomarker and is only present at temperatures at which we observe ennoblement. This bacterium was previously enriched in biocathode systems. Our results suggest that "Candidatus Tenderia electrophaga," and its previously described extracellular electron transfer metabolism coupled to oxygen reduction activity, could play a central role in modulating stainless steel open-circuit potential and consequently mediating ennoblement.

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Citations

Oct 26, 2021·Environmental Microbiology·Lina J BirdSarah M Glaven
Oct 30, 2021·Chemical Reviews·Samantha R McCuskeyThuc-Quyen Nguyen

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Datasets Mentioned

BETA
PRJEB27599
1

Methods Mentioned

BETA
scanning electronic microscopy
scanning electron microscopy
PCR
amplicon sequencing

Software Mentioned

ImageJ
Utils scripts
LEfSe
Illumina
Mothur
Phyloseq R
ggplot2
VSEARCH
Silva
vegan

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