4TH International Congress on Technology - Engineering & SCIENCE - Kuala Lumpur - Malaysia (2017-08-05)

Effect Of Co2 Loading On The Corrosion Of Carbon Steel In Mixed Solution Of N-methyldiethanolamine And Arginine

The use of amine based solvents in absorption processes for natural and flues gas cleaning is the best available technology for mitigation of the increased CO2 concentration in the atmosphere. However, this technology faces a number of serious operational issues. The most important is the corrosion of some parts of the Gas treatment plant especially in the absorber and stripper columns. In this work, electrochemical investigation methods including potentiodynamic polarization and electrochemical impedance spectroscopy (EIS)) were applied to quantify the corrosiveness of carbon steel in CO2 loaded blends of Methyldiethanolamine (MDEA) and Arginine (ARG) at a total two molar concentration and different solvents proportions, temperatures and CO2 partial pressure of the gas. Obtained results show that the corrosion rate increased with increased CO2 partial pressure. The effect of temperature was assessed using Tafel plots which indicated that the rate of corrosion increased with increased temperature. However, when added to MDEA, arginine was found to act as inhibitor, the higher arginine proportion in the mixture, the more inhibition effect was observed.
Abdelbaki Benamor, Ahmed Gomaa Talkhan