Effect of organic silicon quaternary ammonium salts on mitigating corrosion of reinforced steel induced by SRB in mild alkaline simulated concrete pore solution
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第5期
论文作者：Ini-Ibehe Nabuk Etim Junhua Dong Jie Wei Chen Nan Durga Bhakta Pokharel Aniefiok Joseph Umoh Dake Xu Wei Ke
摘 要：The corrosion damage of 20 SiMn 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 36.70μm 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.
Ini-Ibehe Nabuk Etim1,2,3，Junhua Dong1，Jie Wei1，Chen Nan1，Durga Bhakta Pokharel1，Aniefiok Joseph Umoh1，Dake Xu4，Wei Ke1
1. Environmental Corrosion Centre, Institute of Metal Research, Chinese Academy of Sciences2. University of Chinese Academy of Sciences3. Department of Marine Biology, Akwa Ibom State University4. School of Materials Science and Engineering, Northeastern University
摘 要：The corrosion damage of 20 SiMn 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 36.70μm 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.
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