Conductive magnetite nanoparticles considerably accelerated carbon steel corrosion by electroactive Desulfovibrio vulgaris biofilm

• Published in: Corrosion science 2022-08, Vol.205, p.110440, Article 110440
• Main Authors: Wang, Di, Yang, Chuntian, Saleh, Mazen A., Alotaibi, Mohammed D., Mohamed, Magdy E., Xu, Dake, Gu, Tingyue
• Format: Article
• Language: English
• Subjects: Extracellular electron transfer; Magnetite; Microbiologically influenced corrosion; Nanoparticles; Sulfate reducing bacteria
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2022.110440

Carbon steel microbiologically influenced corrosion (MIC) by sulfate reducing Desulfovibrio vulgaris belongs to extracellular electron transfer MIC (EET-MIC). Adding 20 ppm (w/w) Fe3O4 magnetite nanoparticles (MNPs) to ATCC 1249 culture medium did not alter sessile and planktonic cell counts significantly, but it caused 59% more weight loss and 85% deeper pit depth, respectively after 7 days of incubation. Electrochemical data corroborated the increases. In comparison, D. vulgaris MIC of Cu was not affected by 20 ppm MNPs because it belongs to metabolite MIC (M-MIC) without EET. Thus, MNPs can be a useful tool to distinguish some EET-MIC cases from M-MIC. •Magnetite nanoparticles (MNPs) accelerate extracellular electron transfer (EET)•20 ppm (w/w) MNPs accelerate EET-MIC of carbon steel by D. vulgaris•59% and 85% increases in weight loss and pit depth, respectively are observed•Magnetism helps to attract MNPs to a carbon steel coupon surface•Insoluble MNPs can be a useful tool to distinguish EET-MIC from metabolite-MIC