50 and 80 wt.% monoethylene glycol (MEG)/water mixtures at pH 4 and 6 were tested under different hydrodynamic conditions to investigate the MEG effects on CO2 corrosion of carbon steel. At pH 4, the presence of MEG resulted in a lower and less flow-dependent corrosion current density (i(corr)) than those of aqueous solutions. Since MEG changed the physical properties of the solution, it evidently led to a hindered transport of H+ ions to the steel surface and the decreased corrosion kinetics. At pH 6, i(corr) was slightly increased with shear stress in water-only and 50 wt.% MEG solutions, while it was decreased at 80 wt.% MEG concentration. It was found that at pH 6, MEG predominantly inhibited corrosion by anodic adsorption on the active sites and blocking the ionic transport. (c) 2017 Elsevier Ltd. All rights reserved.