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    Short term corrosion monitoring of carbon steel by bio-competitive exclusion of thermophilic sulphate reducing bacteria and nitrate reducing bacteria

    Access Status
    Fulltext not available
    Authors
    Halim, Amalia
    Watkin, Elizabeth
    Gubner, Rolf
    Date
    2012
    Type
    Journal Article
    
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    Citation
    Halim, Amalia and Watkin, Elizabeth and Gubner, Rolf. 2012. Short term corrosion monitoring of carbon steel by bio-competitive exclusion of thermophilic sulphate reducing bacteria and nitrate reducing bacteria. Electrochimica Acta. 77: pp. 348-362.
    Source Title
    Electrochimica Acta
    DOI
    10.1016/j.electacta.2012.06.040
    ISSN
    0013-4686
    URI
    http://hdl.handle.net/20.500.11937/17722
    Collection
    • Curtin Research Publications
    Abstract

    Recent interest has centred on the application of nitrate injection to control reservoir souring. In the present study, the impact of nitrate injection on the corrosion of ASTM A572-50 carbon steel was evaluated. The steel samples were exposed to corrosive production water (high chloride and sulphate) for 21 days at 50 °C. Crude oil and NaNO3 were added as bacterial nutrients. Indigenous bacterial isolates were used and four different conditions were evaluated: control cell (no bacteria), nitrate reducing bacteria (NRB) inoculated cell, sulphate reducing bacteria (SRB) inoculated cell and mixed bacteria (NRB + SRB) inoculated cell. Open circuit potential (Ecorr) and Electrochemical impedance spectroscopy (EIS) were employed to monitor the corrosion process throughout the immersion time. It is shown that the corrosion rates in the cells inoculated with bacteria are lower than the control cell. Both NRB and SRB may offer beneficial corrosion protection to the steel. However, the microscopy results show that localized corrosion in the presence of bacteria is inevitable. Additionally, nitrate promotes the growth of NRB and suppresses the growth of SRB; hence H2S production can be eliminated. NRB oxidize the produced sulphide by SRB and maintain Eh in an inhibitory level to SRB.

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