Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (10): 2638-2646.doi: 10.3866/PKU.WHXB20100927

• ELECTROCHEMISTRY • Previous Articles     Next Articles

Characteristics of theMicrobiologically Influenced Corrosion of 304 Stainless Steel in Reclaimed Water Enviroment

LI Jin, XU Zhao-Yi, LI Jiu-Yi, JIAO Di   

  1. Department of Municipal and Environmental Engineering, Beijing JiaoTong University, Beijing 100044, P. R. China
  • Received:2010-02-24 Revised:2010-04-28 Published:2010-09-27
  • Contact: LI Jin E-mail:jinli@bjtu.edu.cn
  • Supported by:

    The project was supported by the Datang International Power Generation Co., LTD, China (TX06-15).

Abstract:

The growth characteristics of sulfate reducing bacteria (SRB) in real reclaimed water were studied. Characteristics of the biofilm and its main components on the surface of stainless steel 304 (SS304) sample immersed in reclaimed water with SRB, the electrochemical behavior of the interface between the SS304 sample and the biofilm were investigated using atomic force microscopy (AFM), scanning electron microscopy (SEM), energy disperse spectroscopy (EDS), and electrochemical impedance spectroscopy (EIS). The results show that this strain of SRB can survive in reclaimed water. A biofilm formed on the surface of SS304 and consisted of microbial cells, a carbohydrate component from extracellular polymeric substances (EPS) and a corrosion product such as FeS. During the early immersion period (before 7d), the impedance value mainly originated from the contribution of passivation film on the SS304 electrode surface. During the later immersion period (after 14 d), the impedance value was mainly due to the combined effect of the passivation filmand the biofilmon the SS304 electrode surface.

Key words: Reclaimed water, Stainless steel 304, Sulfate reducing bacteria, Biofilm, AFM, EIS

MSC2000: 

  • O646