STUDY ON ELECTROCHEMISTRY CHARACTERISTICSIN MIC BY WIRE BEAM ELECTRODES

J Chin Soc Corr Pro

2002, Vol. 22

Issue (1): 48-53 DOI:

Research Report

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STUDY ON ELECTROCHEMISTRY CHARACTERISTICSIN MIC BY WIRE BEAM ELECTRODES

Zehua Dong;Xingpeng Guo;Hongfang Liu

武汉华中科技大学化学系

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Abstract Wire beam electrode(WBE) was applied to study the m icrobiologically influenced corrosion(MIC) of Q235 carbon steel associated with sulphate reducing bacteria(SRB) in semicontinuous culture medium(to be complete ly refreshed every 72 hours).The potential,galvanic current density and impedanc e mapping,as well as open circuit potential(OCP) and electrochemical impedance s pectrum(EIS) were measured to predict the localized corrosion under biofilm duri ng SRB growing.As a result,the OCP moved negatively gradually with time.However, The mapping showed the potential fluctuation on the WBE surface decreased over t ime due to the conductivity of FeSx(x=0.9～2) metabolized by SRB in th e biofilm.Therefore,the potential mapping could not be a criterion of localized corrosion under biofilm.Instead,the impedance mapping could give a good predicti on to the MIC.In addition,The biofilm capacity moved up to a very large level(～ 105 μF/cm2) in shape of sigmoid when SRB grew.At the same time,both solutio n resi〖JP2〗stance and charge transfer resistance decreased exponentially.〖JP 〗

Key words: microbiologically influenced corrosion carbon steel electrochemical impedance spectrum

Received: 08 October 2000

ZTFLH:

TG174

Corresponding Authors: Zehua Dong

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Zehua Dong; Xingpeng Guo; Hongfang Liu. STUDY ON ELECTROCHEMISTRY CHARACTERISTICSIN MIC BY WIRE BEAM ELECTRODES. J Chin Soc Corr Pro, 2002, 22(1): 48-53 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2002/V22/I1/48

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