Effect of nutrient concentration on corrosion mechanism of X80 pipeline steel caused by sulfate-reducing bacteria

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2024-03, Vol.956, p.118096, Article 118096
• Main Authors: Zhang, Zhuwu, Liu, Chang, Lin, Zhencheng, Guo, Liping, Shuai, Yi, Cheng, Y. Frank
• Format: Article
• Language: English
• Subjects: Microbiologically influenced corrosion; Nutrient salts; Sulfate-reducing bacteria; X80 pipeline steel
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2024.118096

•The dynamic process of SRB corrosion product film formation was revealed.•Without a culture medium, the biofilm formed was relatively thin, but the adhesion and corrosiveness were stronger.•The structural characteristics of corrosion biofilm in the solution with different nutrient concentrations were clarified. In this work, the effects of different nutrient contents in simulated soil solution containing sulfate-reducing bacteria (SRB) on the corrosion of X80 pipeline steel were studied. The highest amount of sessile SRB was found in the initial medium concentration of 1/3, followed by the concentration of 10%, and the lowest in the simulated soil solution without culture medium. However, the biofilm formed in the simulated soil solution without culture medium had the strongest adhesion and corrosiveness, with X80 steel having the highest corrosion rate, which was approximately 7.2 times of the initial medium concentration of 1/3. The research results have a positive role in promoting the development of SRB corrosion prevention technology for buried pipeline.