In the present study, the corrosion properties of carbon steel were evaluated in 50 wt.% Methyldiethanolamine (MDEA) solutions, related to the carbon dioxide (CO2) capture process in fossil fuel-fired power plants. Tests were conducted under an absorber (50°C) condition with different combinations of CO2, oxygen (O2) and heat stable salts (HSS): bicine, formate and sulfate. Corrosion behavior of carbon steel was monitored using electrochemical methods (linear polarization resistance and cyclic polarization). Under the absorber conditions, the addition of CO2 in the MDEA systems significantly increased the corrosion rate and changed the corrosion behavior from a passive to an active state. In addition, the presence of O2 and HSSs in the MDEA/CO2 systems promoted the corrosion process by accelerating both the anodic and cathodic reactions for the corrosion of carbon steel.

Subject
Electrochemical impedance spectroscopy, Corrosion rate, Formates, Sulfates, Polarization curves, Solutions, Corrosion behavior, Oxidizers, Carbon dioxide, Carbon steel, Risk reduction, Linear polarization resistance, Corrosion potential
Keywords:
MDEA, CO2 capture, carbon steel, carbon capture and storage
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2013
Association for Materials Protection and Performance (AMPP)
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