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51316-7527-The Corrosion of Carbon Steel in Supercritical and Subcritical CO2 with the presence of O2

Picture for The Corrosion of Carbon Steel in Supercritical and Subcritical CO2 with the presence of O2

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Product Number: 51316-7527-SG

ISBN: 7527 2016 CP

Author: Nor Roslina Rosli

Publication Date: 2016

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This project aims to investigate the corrosion behavior of carbon steel in supercritical and subcritical CO2 in the presence of O2 as a contaminant. The contaminant concentration corresponds to the amount of O2 that can be present in CO2 from in particular an oxyfuel combustion flue gas. The effect of oxygen (4 vol.%) on the corrosion performance of mild steel (UNS G10180) in CO2-saturated brine was investigated using a 4-liter autoclave in experiments of 48 hours duration. Experiments were conducted at 25°C and 80°C at CO2 partial pressures of 4 MPa and 9 MPa this corresponds to subcritical-supercritical boundary conditions that encompass three different phases of CO2 – gaseous liquid and supercritical. Electrochemical measurements weight loss determination and corrosion product characterization using a multi-pronged analytical approach were conducted. Severe corrosion was observed in the steel specimen after 48 hours of exposure at 25°C with the presence of O2 that accelerated the corrosion reaction. Experiments at 80°C revealed bilayers of corrosion products on the steel surface which consisted of iron carbonate iron oxides and iron oxyhydroxides. Localized corrosion was only observed at 80°C and 4 MPa CO2 in the presence of O2.

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This project aims to investigate the corrosion behavior of carbon steel in supercritical and subcritical CO2 in the presence of O2 as a contaminant. The contaminant concentration corresponds to the amount of O2 that can be present in CO2 from in particular an oxyfuel combustion flue gas. The effect of oxygen (4 vol.%) on the corrosion performance of mild steel (UNS G10180) in CO2-saturated brine was investigated using a 4-liter autoclave in experiments of 48 hours duration. Experiments were conducted at 25°C and 80°C at CO2 partial pressures of 4 MPa and 9 MPa this corresponds to subcritical-supercritical boundary conditions that encompass three different phases of CO2 – gaseous liquid and supercritical. Electrochemical measurements weight loss determination and corrosion product characterization using a multi-pronged analytical approach were conducted. Severe corrosion was observed in the steel specimen after 48 hours of exposure at 25°C with the presence of O2 that accelerated the corrosion reaction. Experiments at 80°C revealed bilayers of corrosion products on the steel surface which consisted of iron carbonate iron oxides and iron oxyhydroxides. Localized corrosion was only observed at 80°C and 4 MPa CO2 in the presence of O2.

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