Predictive Model of Thermodynamic Properties and CO₂ Corrosion of Carbon Steels in CCS Environments

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  • Predictive Model of Thermodynamic Properties and CO<sub>2</sub> Corrosion of Carbon Steels in CCS Environments

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<p>A thermodynamic model (U-Cal model) is proposed to predict the fugacity and water content in the CO2-rich phase (gas or supercritical fluid), and the CO2 solubility and pH in aqueous solutions in a CO2 capture and storage environment, i.e., a CO2 environment in a supercritical state. The values predicted by the U-Cal model agree well with measured values. The water content in the CO2-rich phase increases to 1–10 g/L as a result of the mutual dissolution of CO2 and H2O. The increase in the solubility of CO2 in aqueous solution and the decrease in the pH with increasing pressure are small. The CO2 corrosion behavior of carbon steel is discussed to use the U-Cal model. In iron dissolution-dominant CO2 corrosion in an aqueous solution with carbon steel, the corrosion rate can be understood as a function of the pH. In FeCO3 formation-dominant CO2 corrosion, it is considered that the corrosion progresses as FeCO3 dissolves to supersaturation and then FeCO3 precipitates on the surface of the material. The FeCO3 precipitation behavior is predicted from the crystal growth rate equation. Corrosion of carbon steel in the CO2-rich phase involves similar mechanisms to corrosion in an aqueous solution; however, the corrosion rate is lower.</p><p> </p><p>This Paper was Originally Published in Japanese in Zairyo-to-Kankyo 72 (2023) 131–141.</p>

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 64 (12), 2764-2775, 2023-12-01

    公益社団法人 日本金属学会

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