Carbon steel corrosion rates were measured in carbonated solution mixtures of monoethanolamine (MEA) and 1-Butyl-3-methylimidazolium dicyandiamide ([bmim] [DCA]) and MEA without [bmim] [DCA], using polarization curve and electrochemical impedance spectroscopy (EIS). Corrosion tests were carried out for 4.0 M carbonated MEA and [bmim] [DCA] concentration varied from 0.1 to 1.0 M. The CO2 loading was 0.55 mol/mol and temperature was varied from 40 to 80 oC. Results showed adding [bmim] [DCA] decreased the corrosion rate of carbon steel for 4.0 M MEA/ [bmim] [DCA] system. However, the effect of [bmim] [DCA] addition was less as the temperature increased to 80 oC. Scanning Electron Microscope (SEM) and Energy dispersive X-ray analysis (EDX) were also carried out to characterize the surface morphology and corrosion product formed on the electrode surface. The SEM and EDX spectrum showed that a protective corrosion layer was formed on the electrode surface for 4.0 M MEA/ [bmim] [DCA] system. The corrosion rate of carbon steel was also measured using EIS at 40 oC and 4.0 M MEA/ 1.0 M [bmim] [DCA] with different exposure times. It was found the corrosion rate increased at first, but decreased progressively with time. The results from EIS are consistent with those found from the polarization curve, SEM and EDX.
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Hamah-Ali et al. (2011) studied this question.