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    Assessment of corrosion control by pH neutralisation in the presence of glycol at low temperature

    Access Status
    Fulltext not available
    Authors
    Pojtanabuntoeng, Kod
    Kinsella, Brian
    Ehsani, H.
    McKechnie, J.
    Date
    2017
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Pojtanabuntoeng, K. and Kinsella, B. and Ehsani, H. and McKechnie, J. 2017. Assessment of corrosion control by pH neutralisation in the presence of glycol at low temperature. Corrosion Science.
    Source Title
    Corrosion Science
    DOI
    10.1016/j.corsci.2017.06.018
    ISSN
    0010-938X
    URI
    http://hdl.handle.net/20.500.11937/55134
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 Elsevier Ltd. The effect of pH controlled by n-methyldiethanolamine (MDEA), partial pressure of CO 2 , and monoethylene glycol (MEG) on corrosion behaviour of carbon steel (X65) at 10 °C was investigated. Linear polarisation resistance and electrochemical impedance spectroscopy techniques were used. The optimum pH which yielded reasonable corrosion rate reduction was 6.5-7. While demanded impractical concentration of MDEA, increasing pH further to 8.5 marginally decreased corrosion rate as the reduction of bicarbonate ions became a dominant cathodic reaction. The double layer capacitance decreased in the presence of MEG indicating the adsorption of MEG at the steel surface and reduced corrosion rate.

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