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  • Effect of Pseudomonas fluorescens on buried steel pipeline corrosion

    Author(s)
    Spark, Amy J
    Law, David W
    Ward, Liam P
    Cole, Ivan S
    Best, Adam S
    Griffith University Author(s)
    Cole, Ivan
    Year published
    2017
    Metadata
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    Abstract
    Buried steel infrastructure can be a source of iron ions for bacterial species, leading to microbiologically influenced corrosion (MIC). Localized corrosion of pipelines due to MIC is one of the key failure mechanisms of buried steel pipelines. In order to better understand the mechanisms of localized corrosion in soil, semisolid agar has been developed as an analogue for soil. Here, Pseudomonas fluorescens has been introduced to the system to understand how bacteria interact with steel. Through electrochemical testing including open circuit potentials, potentiodynamic scans, anodic potential holds, and electrochemical ...
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    Buried steel infrastructure can be a source of iron ions for bacterial species, leading to microbiologically influenced corrosion (MIC). Localized corrosion of pipelines due to MIC is one of the key failure mechanisms of buried steel pipelines. In order to better understand the mechanisms of localized corrosion in soil, semisolid agar has been developed as an analogue for soil. Here, Pseudomonas fluorescens has been introduced to the system to understand how bacteria interact with steel. Through electrochemical testing including open circuit potentials, potentiodynamic scans, anodic potential holds, and electrochemical impedance spectroscopy it has been shown that P. fluorescens increases the rate of corrosion. Time for oxide and biofilms to develop was shown to not impact on the rate of corrosion but did alter the consistency of biofilm present and the viability of P. fluorescens following electrochemical testing. The proposed mechanism for increased corrosion rates of carbon steel involves the interactions of pyoverdine with the steel, preventing the formation of a cohesive passive layer, after initial cell attachment, followed by the formation of a metal concentration gradient on the steel surface.
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    Journal Title
    Environmental Science & Technology
    Volume
    51
    Issue
    15
    DOI
    https://doi.org/10.1021/acs.est.7b00437
    Subject
    Microbiology
    Physical properties of materials
    Science & Technology
    Technology
    Life Sciences & Biomedicine
    Engineering, Environmental
    Environmental Sciences
    Publication URI
    http://hdl.handle.net/10072/408928
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    • Journal articles

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