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Effect Of H2S On CO2 Corrosion Of Mild Steel In HPHT Conditions

Product Number: 51321-16622-SG
Author: Yoon-Seok Choi/ Fernando Farelas/ Luciano Paolinelli/ Srdjan Nesic/ Ahmad Zaki B Abas/ Azmi Mohammed Nor/ Muhammad Firdaus Suhor
Publication Date: 2021
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The effect of H2S on the aqueous corrosion behavior of mild steel was evaluated at HPHT conditions (supercritical CO2 pressure) at a total pressure of 12 MPa and a temperature of 160°C. The corrosion rate of steel samples was determined by electrochemical and weight loss measurements. The surface/cross-sectional morphology and the composition of the corrosion product layers were analyzed by using surface analytical techniques (SEM, EDS, and XRD). Results showed that the corrosion rate decreased with time and no significant difference was observed in the presence of 1000 and 2000 ppm of H2S at HPHT CO2 conditions. Surface and cross-sectional analyses revealed that the corrosion process is governed by the formation of FeCO3 regardless of the presence of H2S. Furthermore, the corrosion behavior of mild steel in these conditions did not depend significantly on flow velocity.

Key words: Supercritical CO2, CO2 corrosion, carbon steel, H2S, high temperature

The effect of H2S on the aqueous corrosion behavior of mild steel was evaluated at HPHT conditions (supercritical CO2 pressure) at a total pressure of 12 MPa and a temperature of 160°C. The corrosion rate of steel samples was determined by electrochemical and weight loss measurements. The surface/cross-sectional morphology and the composition of the corrosion product layers were analyzed by using surface analytical techniques (SEM, EDS, and XRD). Results showed that the corrosion rate decreased with time and no significant difference was observed in the presence of 1000 and 2000 ppm of H2S at HPHT CO2 conditions. Surface and cross-sectional analyses revealed that the corrosion process is governed by the formation of FeCO3 regardless of the presence of H2S. Furthermore, the corrosion behavior of mild steel in these conditions did not depend significantly on flow velocity.

Key words: Supercritical CO2, CO2 corrosion, carbon steel, H2S, high temperature

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