10191 Effect of Oxygen and Heat Stable Salts on the Corrosion of Carbon Steel in MDEA-Based CO2 Capture Process

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Product Number: 51300-10191-SG

ISBN: 10191 2010 CP

Author: Deli Duan, Yoon-Seok Choi, Srdjan Nesic, Frederic Vitse, Stephen A. Bedell and Clare Worley

Publication Date: 2010

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The objective of the present study is to evaluate the corrosion properties of carbon steel in MDEA / H₂O / CO₂ / O₂ / HSSs mixtures related to the CO₂ capture process in fossil fuel-fired power plants. Short-term and long-term corrosion tests were performed in 50 wt.% methyldiethanolamine (MDEA) solutions at 50oC under atmospheric pressure with different combinations of CO₂, O₂ and HSSs (bicine, formate, sulfate). Corrosion behavior of carbon steel was evaluated by using electrochemical methods (LPR, EIS and cyclic polarization), weight loss measurements, and surface analytical techniques (SEM and EDS). The results of short-term corrosion tests indicated that the addition of CO₂ in the MDEA systems significantly increased the corrosion rate and changed the corrosion behavior from a passive to active state. However, the corrosion rates of carbon steel did not change significantly with addition of O₂ and HSSs. The corrosion rates of carbon steel decreased with time under MDEA/CO₂ systems whereas it maintained the initial values throughout the tests in MDEA/CO₂/O₂ and MDEA/CO₂/O₂/HSSs environments. The order of the corrosivity was MDEA/CO₂/O₂/HSS > MDEA/CO₂/O₂ > MDEA/CO₂. The corrosion morphology of carbon steel in MDEA/CO₂ systems with O₂ and HSSs showed uniform attack with preferential dissolution of ferrite.

Key words: CO₂ capture, CO₂ corrosion, MDEA, O₂, heat stable salt, carbon steel