华南理工大学学报(自然科学版) ›› 2009, Vol. 37 ›› Issue (10): 135-139.

• 环境科学与技术 • 上一篇    下一篇

Q235钢在含硫酸盐还原菌海水中的腐蚀行为

杨志泉1  周少奇1  刘光洲2  蔺存国2   

  1. 1.华南理工大学 环境科学与工程学院, 广东 广州 510006; 2. 海洋腐蚀与防护国防科技重点实验室, 山东 青岛 266071
  • 收稿日期:2008-01-22 修回日期:2008-03-12 出版日期:2009-10-25 发布日期:2009-10-25
  • 通信作者: 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
  • 作者简介:杨志泉(1978-),男,讲师,博士,主要从事环境生物技术研究.
  • 基金资助:

    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)

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

Yang Zhi-quan 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)

摘要: 为了更好地揭示微生物腐蚀的机理,文中采用腐蚀电位法、极化曲线法、电化学阻抗法、环境扫描电镜法对低碳钢Q235在灭菌海水、接种硫酸盐还原菌(SRB)的海水中的不同腐蚀行为进行了研究.结果表明:在含有SRB的海水中,低碳钢的自腐蚀电位向负相有较大的偏移,最终在-740mV左右逐渐稳定;与在灭菌海水中的腐蚀相比,低碳钢在含SRB海水中的腐蚀电流密度变大,极化电阻减小,腐蚀速度加快;经微生物腐蚀后,低碳钢表面出现了大量的腐蚀孔,发生了严重的孔蚀行为.

关键词: 海水腐蚀, 碳钢, 微生物

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