Journal
CORROSION SCIENCE
Volume 223, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2023.111429
Keywords
Microbiologically influenced corrosion; Desulfovibrio vulgaris; High entropy alloy; Sulfate-reducing bacterium; Hydrogenase genes; Starvation
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The sulfate-reducing bacterium Desulfovibrio vulgaris promotes microbiologically influenced corrosion (MIC) of CoCrFeMnNi high entropy alloy (HEA) and leads to pitting corrosion. D. vulgaris causes the formation of metal sulfides and thinning of passive film. The relative expression of hydrogenase genes hydA and hydB in the biofilms significantly increases, indicating the importance of indirect electron transfer in promoting HEA MIC by D. vulgaris under starvation.
Sulfate-reducing bacterium Desulfovibrio vulgaris promoted the microbiologically influenced corrosion (MIC) of CoCrFeMnNi high entropy alloy (HEA) and led to pitting corrosion. D. vulgaris caused the formation of metal sulfides and thinning of passive film. The corrosion resistance decreased, and pit depths increased when the carbon source reduced to 40%. The relative expression of hydrogenase genes hydA and hydB in the biofilms under 40% carbon source significantly increased, indicating that the indirect electron transfer mediated by 2H+/H2 might play an important role in promoting the HEA MIC by D. vulgaris under starvation.
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