Abstract
Wire Beam Electrode (WBE) made of Q235 carbon steel was applied to study theheterogeneous corrosion beneath biofilm formed by Sulfate Reducing Bacteria (SRB) in cultureand sulfide film in solution with 1% NaCl and 300 mg/L⋅S2-. The potential, galvanic density mapping, as well as polarization curve and Electrochemical Impedance Spectrum (EIS) were measured to predict the localized corrosion under biofilm and sulfide film. As a result, the mappingshowed the potential fluctuation on the WBE suface decreased over time due to the conductivityof the biofilm and sulfide film. Therefore, the potential mapping could not be a criterion of localized corrosion under biofilm. Instead, the current mapping could give a good prediction to theMIC. The sulfide film could inhibit corrosion of carbon steel. However, the biofilm accelerate the corrosion. Polarization resistance Rp increased over time in the Na2S solution if lack of O2. In addition, the biofilm capacity moved up to a very large level (~105 uF/cm2) in shape of Sigmoid withits polarization resistance decreasing exponentially when SRB grew.
Keywords
Biofilm, SRB, Carbon Steel, Wire Beam Electrode, Mapping, EIS
Publication Date
2001-05-28
Online Available Date
2001-05-28
Revised Date
2000-12-14
Received Date
2000-09-24
Recommended Citation
Ze-hua DONG, Xing-peng GUO, Jia-shen ZHENG, Li-ming XU.
Electrochemistry Characteristic of Carbon Steel under Biofilm and Sulfide Film[J]. Journal of Electrochemistry,
2001
,
7(2): 173-179.
DOI: 10.61558/2993-074X.3248
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol7/iss2/10
Included in
Engineering Science and Materials Commons, Materials Chemistry Commons, Materials Science and Engineering Commons, Physical Chemistry Commons, Power and Energy Commons
