物理化学学报 >> 2009, Vol. 25 >> Issue (11): 2191-2198.doi: 10.3866/PKU.WHXB20091116

研究论文 上一篇    下一篇

A3钢在氧化硫硫杆菌作用下的腐蚀行为

李松梅, 杜娟, 刘建华, 于美   

  1. 北京航空航天大学材料科学与工程学院, 空天材料与服役教育部重点实验室, 北京 100191
  • 收稿日期:2009-06-29 修回日期:2009-09-07 发布日期:2009-10-28
  • 通讯作者: 李松梅 E-mail:songmei_li@buaa.edu.cn

Corrosion Behavior of Steel A3 Influenced by Thiobacillus Thiooxidans

LI Song-Mei, DU Juan, LIU Jian-Hua, YU Mei   

  1. Key Laboratory of Aerospace Materials and Performance, Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, P. R. China
  • Received:2009-06-29 Revised:2009-09-07 Published:2009-10-28
  • Contact: LI Song-Mei E-mail:songmei_li@buaa.edu.cn

摘要:

采用表面分析技术、失重法和电化学测试研究了A3钢在氧化硫硫杆菌(T.t)作用下的腐蚀行为. 扫描电子显微镜(SEM)分析结果表明, 与无菌体系相比, 氧化硫硫杆菌会在A3钢表面形成致密的生物膜和腐蚀产物膜. 去除膜层后, 无菌体系中的试样出现点蚀, 氧化硫硫杆菌体系中试样呈现为均匀腐蚀. 浸泡三周后, 氧化硫硫杆菌体系中A3钢的腐蚀失重远小于无菌体系. 电化学交流阻抗谱(EIS)测试结果显示, 在浸泡10 d后, 氧化硫硫杆菌中的电极表面只存在两个时间常数, 这表明氧化硫硫杆菌会在试样表面形成致密且附着力非常强的产物膜层, 有效地阻碍了腐蚀介质对基体的侵蚀. 极化曲线结果表明, 浸泡20 d后, 氧化硫硫杆菌的存在使得金属具有较小的自腐蚀电流密度.

关键词: 微生物腐蚀, 氧化硫硫杆菌, 表面分析技术, 失重法, 电化学交流阻抗谱, 极化曲线

Abstract:

Surface analysis method, mass loss method, and electrochemical test were employed to investigate the corrosion behavior of steel A3 under the effect of Thiobacillus thiooxidans (T.t). Scanning electronic microscopy (SEM) results indicated that the presence of T.t resulted in a more compact biofilm and product film. Pitting occurred on the steel A3 coupon immersed into a sterile system while the one in the T.t system showed general corrosion. The average corrosion rate in the sterile system was greater than that in the T.t system after 3 weeks. Electrochemical impedance spectroscopy (EIS) showed that there were only two time constants for the sample immersed in the T.t system after 10 days. This demonstrates that a compact and strongly inserted product film was formed on the surface of coupon in the presence of T.t which effectively obstructed the erosion of caustic ions. Polarization curve results showed that the corrosion current density of the metal decreased after 20 days of exposure to the T.t solution.

Key words: Microbiologically influenced corrosion, Thiobacillus thiooxidans, Surface analysis method, Mass loss method, Electrochemical impedance spectroscopy, Polarization curve

MSC2000: 

  • O646