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Modeling steel corrosion under supercritical CO2 conditions

Authors

  • Y. Zhang,

    1. Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083 (P. R. China)
    2. Institute for Maintenance and Corrosion Protection Technologies, Kalkofen 4, D-58638 Iserlohn (Germany)
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  • K. Gao,

    1. Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083 (P. R. China)
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  • G. Schmitt,

    Corresponding author
    1. Institute for Maintenance and Corrosion Protection Technologies, Kalkofen 4, D-58638 Iserlohn (Germany)
    • Institute for Maintenance and Corrosion Protection Technologies, Kalkofen 4, D-58638 Iserlohn (Germany).
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  • R. H. Hausler

    1. Blade Energy Partners, 16225 Park Ten Place, Houston, TX 77084 (USA)
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Abstract

Corrosion in the presence of CO2 was studied under supercritical conditions (high pressure and moderate temperature) using different carbon steels and various corrosion resistant alloys (CRA's). An objective of this work was, among others, to put the results in perspective relative to various CO2 corrosion models that have been developed and published over the years. In particular, the NORSOK, FREECORP, and OLI models were used for comparison, while others were discussed as well. The systems investigated were (a) supercritical CO2 (SC CO2) saturated with water (no separate water phase), (b) a water mist phase in equilibrium with SC CO2, (c) a water/brine phase in equilibrium with SC CO2. It was found that the OLI model best simulates the experimental corrosion rates observed in system (c) where coupons were corroded in the aqueous phase at high velocities in the rotating cage. The varying susceptibility of different carbon steels to corrosion under these conditions is highlighted. CRA steels are comparatively more resistant.

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