The corrosion behavior of carbon steel was investigated under supercritical CO2 (scCO2) – water systems to simulate the condition of CO2 transportation pipeline in the CO2 sequestration applications. To understand the thermodynamic properties of scCO2-water systems related to the corrosion phenomena, thermodynamic modeling were conducted to determine the mutual solubilities of CO2 and water in the two coexisting phases, and to calculate the concentrations of corrosive species in the free water at various pressures and temperatures. Carbon steel samples were exposed to water-saturated CO2, and CO2-saturated water in the pressure range of 40 to 80 bar at 50oC. The corrosion rate of samples was determined by weight loss measurements. The surface morphology and the composition of the corrosion product layers were analyzed by using surface analytical techniques (SEM and EDS).

Subject
Water, Thermodynamics, Modeling, Hydrogen concentration, Corrosion rate, Iron carbonate, Pipelines, Solubility, Gas pressure, Water chemistry, Acidity, Experimental data, Carbon steel
Keywords:
supercritical CO2, thermodynamic modeling, CO2 corrosion, carbon steel
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2009
Association for Materials Protection and Performance (AMPP)
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