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Electrochemical Investigation Into the Influence of Monoethylene Glycol on CO2 Corrosion in the Presence of Acetic Acid

Product Number: 51321-16332-SG
Author: Md Mayeedul Islam/Rolf Gubner/Thunyaluk Pojtanabuntoeng
Publication Date: 2021
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This study aims to i) determine the dissociation constant (pKa) of acetic acid (HAc) in monoethylene glycol (MEG) which is used to calculate the relative amount of undissociated HAc at different pH, and ii) investigate the influence of MEG on CO2 corrosion of carbon steel in the presence of HAc. The study reveals that MEG increases the pKa of HAc and obstructs its dissociation. The later effect is remarkable at pH 5 and greater. MEG also hinders the galvanic effect of ferrite and cementite by adsorbing on the active sites and reduce the corrosion rate. The inhibition efficiency of MEG is strongly dependent on its concentration. HAc is found to aggravate the corrosion of carbon steel but its activity considerably reduces with increasing MEG concentration.

Keywords: Monoethylene glycol; dissociation constant; CO2 corrosion; acetic acid; desorption potential

This study aims to i) determine the dissociation constant (pKa) of acetic acid (HAc) in monoethylene glycol (MEG) which is used to calculate the relative amount of undissociated HAc at different pH, and ii) investigate the influence of MEG on CO2 corrosion of carbon steel in the presence of HAc. The study reveals that MEG increases the pKa of HAc and obstructs its dissociation. The later effect is remarkable at pH 5 and greater. MEG also hinders the galvanic effect of ferrite and cementite by adsorbing on the active sites and reduce the corrosion rate. The inhibition efficiency of MEG is strongly dependent on its concentration. HAc is found to aggravate the corrosion of carbon steel but its activity considerably reduces with increasing MEG concentration.

Keywords: Monoethylene glycol; dissociation constant; CO2 corrosion; acetic acid; desorption potential

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Product Number: 51300-00498-SG
ISBN: 00498 2000 CP
Author: J.J. Gonzfilez, M.E. Afonso, G. Pellegrino
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