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  • Investigating the Effect of Water Content in Supercritical CO2 as Relevant to the Corrosion of Carbon Capture and Storage Pipelines

    Author(s)
    Sim, S
    Bocher, F
    Cole, IS
    Chen, X-B
    Birbilis, N
    Griffith University Author(s)
    Cole, Ivan
    Year published
    2014
    Metadata
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    Abstract
    Steel coupons were exposed to a supercritical carbon dioxide (CO2) environment in which water contamination was deliberately added over the range from 100 ppmw to 50,000 ppmw. Exposure was carried out in a laboratory scale autoclave at 8 MPa and 40°C for 7 days. Contaminant water in CO2 permits the speciation of carbonic acid (H2CO3), which can itself be a threat to durability, but also permit further contaminants to segregate to the aqueous acid phase. A systematic investigation of corrosion in supercritical CO2 over a range of water concentrations is lacking in the literature, despite being a significant elementary issue. ...
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    Steel coupons were exposed to a supercritical carbon dioxide (CO2) environment in which water contamination was deliberately added over the range from 100 ppmw to 50,000 ppmw. Exposure was carried out in a laboratory scale autoclave at 8 MPa and 40°C for 7 days. Contaminant water in CO2 permits the speciation of carbonic acid (H2CO3), which can itself be a threat to durability, but also permit further contaminants to segregate to the aqueous acid phase. A systematic investigation of corrosion in supercritical CO2 over a range of water concentrations is lacking in the literature, despite being a significant elementary issue. Herein, weight-loss tests were performed, and subsequent scanning electron microscopy suggested all specimens displayed some extent of corrosion. The main corrosion mechanism observed was uniform corrosion. Supplementary optical profilometry suggested that water concentration has a small effect on any pitting corrosion that occurred. In general, increased mass loss was observed with an increase in water concentration beyond ~1,000 ppmw H2O, concomitant with a rate of change in the H2CO3 concentration.
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    Journal Title
    Corrosion: journal of science and engineering
    Volume
    70
    Issue
    2
    DOI
    https://doi.org/10.5006/0944
    Subject
    Chemical engineering
    Civil engineering
    Materials engineering
    Materials engineering not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/173739
    Collection
    • Journal articles

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