Microbiologically influenced corrosion of titanium by Desulfovibrio vulgaris biofilm under organic carbon starvation.

Autor: Unsal T; Department of Chemical and Biomolecular Engineering, Institute for Corrosion and Multiphase Technology, Ohio University, Athens OH 45701, USA; Institute of Marine Sciences and Management, Istanbul University, Istanbul 34134, Turkey., Xu L; Department of Chemical and Biomolecular Engineering, Institute for Corrosion and Multiphase Technology, Ohio University, Athens OH 45701, USA., Jia R; Department of Chemical and Biomolecular Engineering, Institute for Corrosion and Multiphase Technology, Ohio University, Athens OH 45701, USA., Kijkla P; Department of Chemical and Biomolecular Engineering, Institute for Corrosion and Multiphase Technology, Ohio University, Athens OH 45701, USA; PTT Exploration and Production, Bangkok 10900, Thailand., Kumseranee S; PTT Exploration and Production, Bangkok 10900, Thailand., Punpruk S; PTT Exploration and Production, Bangkok 10900, Thailand., Mohamed ME; Research and Development Center, Saudi Arabian Oil Company, Dhahran 31311, Saudi Arabia., Saleh MA; Research and Development Center, Saudi Arabian Oil Company, Dhahran 31311, Saudi Arabia., Gu T; Department of Chemical and Biomolecular Engineering, Institute for Corrosion and Multiphase Technology, Ohio University, Athens OH 45701, USA. Electronic address: gu@ohio.edu.
Jazyk: angličtina
Zdroj: Bioelectrochemistry (Amsterdam, Netherlands) [Bioelectrochemistry] 2023 Feb; Vol. 149, pp. 108307. Date of Electronic Publication: 2022 Oct 17.
DOI: 10.1016/j.bioelechem.2022.108307
Abstrakt: Desulfovibrio vulgaris biofilm was pre-grown on Ti coupons for 7 d and then the biofilm covered coupons were incubated again with fresh culture media with 10 % (reduced) and 100 % (normal) carbon source levels, respectively. After the pre-growth, sessile D. vulgaris cell count reached 10 7 cells/cm 2 . The sessile cell counts were 2 × 10 7 and 4.2 × 10 7 cells/cm 2 for 10 % and 100 % carbon sources, respectively after the subsequent 7 d starvation test. The maximum pit depth after the 7 d pre-growth was 4.7 µm. After the additional 7 d of the starvation test, the maximum pit depth increased to 5.1 µm for 100 % carbon source vs 6.2 µm for 10 % carbon source. Corrosion current density (i corr ) from potentiodynamic polarization data at the end of the 7 d starvation test for 10 % carbon source was more than 3 times of that for 100 % carbon source, despite a reduced sessile cell count with 10 % carbon source. The polarization resistance (R p ) started to decrease within minutes after 20 ppm (w/w) riboflavin (electron mediator) injection. The carbon starvation data and riboflavin corrosion acceleration data both suggested that D. vulgaris utilized elemental Ti as an electron source to replace carbon source as the electron donor during carbon source starvation.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2022 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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