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  • Investigation of agar as a soil analogue for corrosion studies

    Author(s)
    Spark, AJ
    Cole, I
    Law, D
    Marney, D
    Ward, L
    Griffith University Author(s)
    Cole, Ivan
    Year published
    2016
    Metadata
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    Abstract
    Solid agar based gels have been investigated as an electrolyte system for the electrochemical study of soil corrosion, specifically microbiologically influenced corrosion (MIC) in soil. Traditional techniques for studying corrosion in soil include solutions and soil samples; however these systems do not reliably simulate the physico-chemical properties of soil. Soils are complex environments with three phases critical to corrosion (solid-soil, liquid-water and gas-oxygen). Therefore there is a need for a system which replicates and considers this complex environment and its effects on corrosion processes, while reducing ...
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    Solid agar based gels have been investigated as an electrolyte system for the electrochemical study of soil corrosion, specifically microbiologically influenced corrosion (MIC) in soil. Traditional techniques for studying corrosion in soil include solutions and soil samples; however these systems do not reliably simulate the physico-chemical properties of soil. Soils are complex environments with three phases critical to corrosion (solid-soil, liquid-water and gas-oxygen). Therefore there is a need for a system which replicates and considers this complex environment and its effects on corrosion processes, while reducing inconsistencies and variations associated with moisture and oxygen content in soil. Open circuit potential (OCP) and potentiodynamic scans (PDS) were conducted on carbon steel exposed to solid agar electrolyte with varying oxygen concentrations. Results were analysed using Tafel extrapolation, consistency in anodic-cathodic trends and optical microscopy of the exposed regions. For the conditions tested, a cathodic shift was seen with the observed corrosion potentials being notably lower than the measured OCPs. Consistency in the anodic-cathodic trends of the PDS was observed with minimal oxygen conditions. Overall, an agar based gel system has potential as an electrolyte for soil based MIC studies, especially as an analogue for moist clay soils.
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    Journal Title
    Materials and Corrosion
    Volume
    67
    Issue
    1
    DOI
    https://doi.org/10.1002/maco.201508312
    Subject
    Inorganic chemistry
    Civil engineering
    Materials engineering
    Materials engineering not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/173718
    Collection
    • Journal articles

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