Inhibition of X65 carbon steel corrosion by Desulfovibrio ferrophilus IS5 using plant-based anthraquinone (C2026-00155)
Monday, March 16, 2026
9:00 AM - 9:30 AM Central
Location: 361 AB
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Adnan Khan, Lingjun Xu, Gary Jenneman, Ed Burger, Tingyue Gu
Sulfate reducing bacteria (SRB) biofilms are often responsible for microbiologically influenced corrosion (MIC) in oil and gas pipelines. Biocides in addition to pigging are often employed to mitigate pipeline MIC. Anthraquinone (AQ), a plant-based SRB inhibitor, was assessed as a green chemical to mitigate X65 carbon steel MIC. Desulfovibrio ferrophilusIS5, a highly corrosive SRB strain, was grown in enriched artificial seawater (EASW) culture medium at 28 oC. Various assays, including planktonic and sessile cell counts, biofilm imaging, X65 carbon steel weight loss measurements, pitting analysis, and electrochemical corrosion tests were used to determine the efficacy of AQ against SRB MIC. An undetectable SRB sessile cell count and 99% decrease in weight loss were achieved by 25 ppm (w/w) AQ after 7 d under static incubation in 125 mL anaerobic vials with 50 mL EASW. Biofilm imaging corroborated the sessile cell count data. Moreover, electrochemical tests using AQ injection (100 ppm) at 3-d incubation (to form pre-existing SRB biofilms) further endorsed the superior efficacy of AQ based on a larger (120%) decline in corrosion rate compared to the 84% decline achieved by 100 ppm tetrakis (hydroxymethyl) phosphonium sulfate injection. Additional tests were carried out to probe the AQ inhibition mechanism.
