Acta Metallurgica Sinica (English Letters) ›› 2015, Vol. 28 ›› Issue (1): 93-102.DOI: 10.1007/s40195-014-0173-9

• Orginal Article • Previous Articles     Next Articles

Microbiologically Induced Corrosion of X80 Pipeline Steel in a Near-Neutral pH Soil Solution

Tang-Qing Wu1,2, Mao-Cheng Yan1, De-Chun Zeng3, Jin Xu1, Chang-Kun Yu1, Cheng Sun1(), Wei Ke1   

  1. 1.Environmental Corrosion Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
    2.School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, China
    3.Oil-Gas Storage and Transportation Company of Xinjiang Oilfield Branch, Karamay, 834002, China
  • Received:2014-04-08 Revised:2014-08-26 Online:2015-01-10 Published:2015-07-23

Abstract:

MIC of X80 pipeline steel in a near-neutral pH soil solution in the presence and absence of sulfate-reducing bacteria (SRB) was monitored by electrochemical techniques and microbiological tests. The results show that soil solution is more close to the complex soil environment around pipeline. The activity of SRB leads to the shift of the phase response to low frequency, the decrease of electrolyte resistance and the alteration of dielectric constant of the film. Both the activity and metabolite of SRB influence the corrosion behavior of the steel. The steel surface undergoes localized attack in the SRB-inoculated soil solution, whereas only slight uniform corrosion occurs in the sterile soil solution.

Key words: Sulfate-reducing bacteria, Pipeline steel X80, Electrochemical impedance spectroscopy (EIS), Scanning electron microscopy