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27. Impact of Desulfovibrio ferrophilusIS5 biocorrosion time on X80 carbon steel mechanical property degradation

Author

Li, Zhong, Yang, Jike, Lu, Shihang, Dou, Wenwen, and Gu, Tingyue

Abstract

Three different incubation times (7, 14 and 21 d) were used to immerse X80 carbon steel dogbone coupons in deoxygenated enriched artificial seawater at 28 °C inoculated with Desulfovibrio ferrophilus(strain IS5), a very corrosive sulfate reducing bacterium to cause microbiologically influenced corrosion (MIC). It was found that 21 d immersion had the largest weight loss (24.8 mg cm−2equivalent to 0.55 mm/year corrosion rate), smallest sessile cell count (6.8 × 108 cell/cm2), deepest pit depth (30.6 μm), and most severe mechanical degradation (9 % loss in ultimate strength and 18 % loss in ultimate strain). Due to nutrient depletion in the static incubation system, corrosion rate and sessile cell count were the highest at 0.82 mm/year and 1.1 × 109 cell cm−2, respectively at 7 d. The results from scanning electron microscopy, X-ray photoelectron spectroscopy and confocal laser scanning microscopy analyses and electrochemical corrosion measurements supported the sessile cell counts and biocorrosion weight loss data.

Published
2023
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36. Assessment Of 2,2-Dibromo-3-Nitrilopropionamide Biocide Enhanced By D-Tyrosine Against Zinc Corrosion By A Sulfate Reducing Bacterium

Author

Unsal, Tuba, Wang, Di, Kumseranee, Sith, Punpruk, Suchada, Mohamed, Magdy El-Said, Saleh, Mazen A., and Gu, Tingyue

Abstract

The biocorrosion of pure zinc by sulfate reducing bacterium (SRB) Desulfovibrio vulgaris was found to be very severe (2.3 +/- 0.1 mm/y) after 7 d incubation in 100 mL of ATCC 1249 medium at 37 degrees C in 125 mL anaerobic vials. D-tyrosine was evaluated as a biocide enhancer for the 2,2-dibromo-3-nitrilopropionamide (DBNPA) biocide mitigation of microbiologically influenced corrosion (MIC). The 100 ppm (w/w) DBNPA alone treatment was found to reduce the SRB sessile cell count by 2-log, zinc weight loss by 48%, and corrosion pit depth by 86%. This biocide treatment was enhanced by its combination with 1 ppm D-tyrosine, which achieved 4-log sessile cell reduction, 70% zinc weight loss reduction, and 92% pit depth reduction compared with the untreated control. Headspace H2S concentrations confirmed that better biocide treatment led to less biogenic H2S. Electrochemical corrosion data supported weight loss and pit depth data.

Published
2021

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