Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (11): 2659-2668.doi: 10.3866/PKU.WHXB201208243

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Effect of Urea on Microbiologically Induced Corrosion of Carbon Steel in Soil

SUN Cheng, LI Xi-Ming, XU Jin, YAN Mao-Cheng, WANG Fu-Hui, WANG Zhen-Yao   

  1. State Key Laboratory for Corrosion and Protection, Institute of Metals Research, Chinese Academy of Sciences, Shenyang 110016, P. R. China
  • Received:2012-06-12 Revised:2012-08-22 Published:2012-10-17
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (50971128, 51161001) and National RD Infrastructure and Facility Development Program of China (2005DKA10400-CT-2-02).


The effect of urea on microbiologically induced corrosion (MIC) of carbon steel in soil was investigated using weight-loss measurement, electrochemical polarization, and electrochemical impedance spectroscopy (EIS). Urea tends to accelerate corrosion of carbon steel in inoculated soils and inhibit corrosion in sterile soils. In inoculated soils, FeS2 was detected in corrosion products because of the presence of sulfate-reducing bacteria (SRB). The EIS results showed that the process was controlled by concentration polarization in the later stages.

Key words: Sulphate-reducing bacteria, Carbon steel, Urea, Electrochemical impedance spectroscopy, Weight loss