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Effects of Sulphate-reducing Bacteria on Corrosion Behaviour of 2205 Duplex Stainless Steel

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Abstract

The effects of sulphate-reducing bacteria (SRB) on the 2205 duplex stainleas steel in the sea water and oil industry environments were studied by electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and microorganism analysis. The results showed that the detected SRB was the non-spore bacillus of about 0.8 μm × (1.8–2.2) μm in size and the content of S was about 7.59% in the corrosion products, SRB contributed to the corrosion evolution which caused the corrosion failure of 2205 duplex stainless steel pipe in the liquid hydrocarbon cooler. During the corrosion process, the produced H2S could significantly influence the anodic process and finally accelerate the corrosion. SEM observation indicated that the distribution of SRB on the surface of 2205 duplex stainless steel was nonuniform. X-ray photoelectron spectroscopy analysis revealed that the surface film was composed of Cr2O3, MoO3, FeS, FeS2, Fe(OH)2 and FeO after immersing the sample in the SRB medium for 14 d.

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Authors and Affiliations

  1. Transportation Equipments and Ocean Engineering College, Dalian Maritime University, Dalian, Liaoning, 116026, China

    Cheng-hao Liang (Doctor, Professor) & Nai-bao Huang

  2. School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, 116023, China

    Hua Wang

Authors
  1. Cheng-hao Liang
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  2. Hua Wang
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  3. Nai-bao Huang
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Correspondence to Cheng-hao Liang.

Additional information

Foundation Item: Item Sponaored by National Natural Science Foundation of China (21276036, 51101025)

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Liang, Ch., Wang, H. & Huang, Nb. Effects of Sulphate-reducing Bacteria on Corrosion Behaviour of 2205 Duplex Stainless Steel. J. Iron Steel Res. Int. 21, 444–450 (2014). https://doi.org/10.1016/S1006-706X(14)60069-8

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  • DOI: https://doi.org/10.1016/S1006-706X(14)60069-8

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