J. Mater. Sci. Technol. ›› 2022, Vol. 107: 43-51.DOI: 10.1016/j.jmst.2021.07.039

• Research Article • Previous Articles     Next Articles

Mitigation of sulfate reducing Desulfovibrio ferrophilus microbiologically influenced corrosion of X80 using THPS biocide enhanced by Peptide A

Junlei Wanga,b, Hongfang Liub,*(), Magdy El-Said Mohamedc, Mazen A.Salehc, Tingyue Gua,*()   

  1. aDepartment of Chemical and Biomolecular Engineering, Institute for Corrosion and Multiphase Technology, Ohio University, Athens, OH 45701, USA
    bSchool of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
    cResearch and Development Center, Saudi Arabian Oil Company, Dhahran 31311, Saudi Arabia
  • Received:2021-05-17 Revised:2021-05-17 Accepted:2021-05-17 Published:2022-04-30 Online:2022-04-28
  • Contact: Hongfang Liu,Tingyue Gu
  • About author:gu@ohio.edu (T. Gu).
    *: E-mail addresses: liuhf@hust.edu.cn (H. Liu)

Abstract:

Tetrakis hydroxymethyl phosphonium sulfate (THPS) was enhanced by a 14-mer Peptide A, with its core 12-mer sequence mimicking part of Equinatoxin II protein, in the mitigation of sulfate reducing Desulfovibrio ferrophilus MIC (microbiologically influenced corrosion) of X80 carbon steel. Results proved that 50 ppm (w/w) THPS was sufficient to mitigate the D. ferrophilus biofilm, and its very agressive MIC (19.7 mg/cm 2 in 7 days or 1.31 mm/a), but not 20 ppm THPS. To achieve effective mitigation at a low dosage of THPS, biofilm-dispersing Peptide A was added to 20 ppm THPS in the culture medium. Sessile cell counts were reduced by 2-log and 4-log after enhancement by 10 ppb and 100 ppb Peptide A, respectively. Enhancement efficiency (further reduction in corrosion rate) reached 69% for 10 ppb Peptide A and 83% for 100 ppb Peptide A compared with 20 ppm THPS alone treatment, indicating that Peptide A was a good biocide enhancer for THPS.

Key words: Microbiologically influenced corrosion, Carbon steel, Sulfate-reducing bacteria, Biofilm, Biocide