Journal of South China University of Technology (Natural Science Edition) ›› 2009, Vol. 37 ›› Issue (10): 135-139.

• Environment Science & Technology • Previous Articles     Next Articles

Corrosion Behaviors of Q235 Steel in Seawater Containing Sulfate-Reducing Bacteria

Yang Zhi-quan1  Zhou Shao-qi1  Liu Guang-zhou2  Lin Cun-guo2   

  1. 1. School of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, Guangdong, 2. State Key Laboratory for Marine Corrosion and Protection, Qingdao 266071, Shandong, China
  • Received:2008-01-22 Revised:2008-03-12 Online:2009-10-25 Published:2009-10-25
  • Contact: 周少奇（1965-），男，教授，博士生导师，主要从事固废资源化与环境生物技术研究．E-mail：fesqzhou@scut．edu．cn E-mail:zqyang@scut．edu．cn
  • About author:杨志泉（1978-），男，讲师，博士，主要从事环境生物技术研究．
  • Supported by:

    国家科技成果重点推广项目（2005EC000288）;广州市环境保护局污染防治技术开发项目（200803）

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Abstract:

In order to better reveal the mechanism of microbiological corrosion, the corrosion behaviors of mild steel Q235 in marine conditions with/without sulfate-seducing bacteria （SRB） were investigated via such electrochemical methods as the corrosion potential, the polarization curve, the electrochemical impedance spectrometry and the en- vironmental scanning electron microscopy. The results show that （ 1 ） due to the existence of SRB, the corrosion potential of Q235 steel in marine conditions rapidly shifts to the passive potential region until it is gradually stabilized at a value of about - 740 mV ; （2） in the marine condition with SRB, both th.e corrosion current density and the corrosion rate increase, while the polarization resistance becomes lower; and （3） after the microbiological corrosion, there forms a large amount of holes on the surface of Q235 steel, which shows the occurrence of heavy pitting corrosion.

Key words: seawater corrosion, carbon steel, microorganism