EFFECTS BIOFILM ON CORROSION OF CARBON STEEL

J Chin Soc Corr Pro

1999, Vol. 19

Issue (5): 291-295 DOI:

Research Report

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EFFECTS BIOFILM ON CORROSION OF CARBON STEEL

Hongfang Liu;;;

华中科技大学化学系

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Abstract In this paper,the biofilm of sulfate reducing bacteria(SRB)which plays an important role in corrosion of carbon steel under anaerobic condition has been studied.The postgate medium was used to culture Jianghan oilfield SBR.Electrochemical impedance spectroscopy(EIS)was used to analyse the electrode process of carbon steel with SBR biofilm.The advantage of EIS lies in its minor disturbance of surface effect of the biofilm.X-ray diffraction and gas chromatography and mass spectrometry(GC/MS)techniques were used to analyse the corrosion products and the metabolites of SRB.The results showed that the main metablites of SRB sampled from Jianghan oilfield were butanic and benzoic acid and the corrosion products contained FeS and Fe2P. The variation of activit of the SRB biofilm with SRB growth can be found from the EIS in SRB-inoculation media.The extracellular polymeric substance of biofilm stimulated the concentration of nutrition and corrosion products,so it could accelerate the corrosion process.

Key words: SRB microbial corrosion GC/MS technique electrochemical impedance spectrometry

Received: 23 October 1998

Corresponding Authors: Hongfang Liu

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Cite this article:

Hongfang Liu. EFFECTS BIOFILM ON CORROSION OF CARBON STEEL. J Chin Soc Corr Pro, 1999, 19(5): 291-295 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1999/V19/I5/291

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