J. Mater. Sci. Technol. ›› 2021, Vol. 64: 126-140.DOI: 10.1016/j.jmst.2019.10.006

• Research Article • Previous Articles     Next Articles

Effect of organic silicon quaternary ammonium salts on mitigating corrosion of reinforced steel induced by SRB in mild alkaline simulated concrete pore solution

Ini-Ibehe Nabuk Etima,b,c, Junhua Donga,*(), Jie Weia,*(), Chen Nana, Durga Bhakta Pokharela, Aniefiok Joseph Umoha, Dake Xud, Mingzhong Sue, Wei Kea   

  1. aEnvironmental Corrosion Centre, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
    bUniversity of Chinese Academy of Sciences 19A Yuquan Road, Shijingshan District, Beijing 100049, China
    cDepartment of Marine Biology, Akwa Ibom State University, P.M.B. 1167, Uyo, Nigeria
    dSchool of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
    eSani-care Salon Products, Inc., USA
  • Received:2019-06-22 Accepted:2019-08-24 Published:2021-02-20 Online:2021-03-15
  • Contact: Junhua Dong,Jie Wei
  • About author:jwei@imr.ac.cn (J. Wei).
    *. E-mail addresses: jhdong@imr.ac.cn (J. Dong)

Abstract:

The corrosion damage of 20SiMn steel by sulphate-reducing bacteria (SRB) and the mitigation effect of organic silicon quaternary ammonium salt (OSA) were studied in sterilized mild alkaline simulated concrete pore solution (STR) with different additions of SRB and OSA at pH 9.35 for 28 days. Uniform corrosion occurs in STR medium while slight localized corrosion is observed in STR + OSA medium, and localized pitting corrosion occurs in STR + SRB and STR + SRB + OSA media. The largest pit depth reduces from 36.70 μm in STR + SRB medium to 3.31 μm in STR + SRB + OSA medium due to the mitigation effect of OSA. The corrosion rate reflected by weight loss and electrochemical impedance spectroscopy (EIS) results presents the order of STR < STR + OSA < STR + SRB + OSA < STR + SRB, which also proves that the presence of SRB can accelerate corrosion in a carbonated medium. However, OSA as an efficient bacteriostatic agent can reduce the excessive growth of SRB and thus reduce corrosion.

Key words: Steel reinforced concrete, Microbial corrosion, Biocide, EIS