Biochemical and microbiological characterization of a thermotolerant bacterial consortium involved in the corrosion of Aluminum Alloy 7075

Microorganisms can play a significant role in material corrosion, with bacterial biofilms as major participants in microbially influenced corrosion (MIC). The exact mechanisms by which this takes place are poorly understood, resulting in a scarcity of information regarding MIC detection and preventi...

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Published in:World journal of microbiology & biotechnology 2024-01, Vol.40 (1), p.36-36, Article 36
Main Authors: Atalah, J., Blamey, L., Amenabar, M. J., Kelley-Loughnane, N., Blamey, J. M.
Format: Article
Language:English
Subjects:
Acidification
Alloys - chemistry
Aluminum
Aluminum - chemistry
Aluminum - metabolism
Aluminum - pharmacology
Aluminum alloys
Aluminum base alloys
Applied Microbiology
Bacteria
Bacteria - metabolism
Bacterial corrosion
Biochemistry
Biofilms
Biomedical and Life Sciences
Biotechnology
Consortia
Corrosion
Corrosion mechanisms
Culture media
Electron microscopy
Environmental Engineering/Biotechnology
Galactose
Humans
Life Sciences
Mannose
Metabolism
Microbiology
Microorganisms
Minimum inhibitory concentration
Polysaccharides
Ribose
Steel - chemistry
Sulfate reduction
Thermophilic bacteria
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Summary:Microorganisms can play a significant role in material corrosion, with bacterial biofilms as major participants in microbially influenced corrosion (MIC). The exact mechanisms by which this takes place are poorly understood, resulting in a scarcity of information regarding MIC detection and prevention. In this work, a consortium of moderately thermophilic bacteria isolated from a biofilm growing over aluminum alloy 7075 was characterized. Its effect over the alloy was evaluated on a 40-day period using Electron Microscopy, demonstrating acceleration of corrosion in comparison to the abiotic control. The bacterial consortium was biochemically and microbiologically characterized as an attempt to elucidate factors contributing to corrosion. Molecular analysis revealed that the consortium consisted mainly of members of the Bacillus genus, with lower abundance of other genera such as Thermoanaerobacterium , Anoxybacillus and Paenibacillus . The EPS polysaccharide presented mainly mannose, galactose, rhamnose and ribose. Our observations suggest that the acidification of the culture media resulting from bacterial metabolism acted as the main contributor to corrosion, hinting at an unspecific mechanism. The consortium was not sulfate-reducing, but it was found to produce hydrogen, which could also be a compounding factor for corrosion.
ISSN:0959-3993
1573-0972
DOI:10.1007/s11274-023-03808-9