Erosion-corrosion of carbon steel material in sweet production; CO2 gas containing environment; is commonly controlled by chemical inhibitors. Likewise, pure corrosion, inhibited corrosion is also affected by solid particle erosion. The presence of solid particles in the produced fluid could result in different inhibitor efficiency as it compared to particles free fluid, and thus different inhibitor concentrations are required to maintain protection. This paper presents a study of inhibited erosion-corrosion in a flow containing sand or CaCO3 particles. The effect of solid particle erosion caused by either sand or CaCO3 on inhibitor efficiency is experimentally characterized in a flow loop set up with a direct impingement geometry using long-term Weight Loss (WL) and Linear Polarization Resistance (LPR) techniques. For flow tests considered in this study, both CaCO3 and sand particles resulted in a comparable corrosion rate of carbon steel materials at higher and lower concentration of imidazoline based inhibitor. Consequently, comparable inhibitor efficiency was measured with solid particles having different erosivity. Inhibition mechanisms and the relation between inhibitor concentration and corrosion rate are demonstrated by the Frumkin adsorption isotherm.

Subject
Materials, Inhibitor performance, Solid particles, Sand, Corrosion rate, Iron, Iron carbonate scale, Scale formation, Corrosion inhibitors, Erosion, Carbon steel, Erosion corrosion, Linear polarization resistance
Keywords:
Iron Carbonate Scale (FeCO3), CO2 Corrosion, Erosion, Erosion-Corrosion, Sand, Calcium Carbonate Particles (CaCO3), Inhibited Erosion-Corrosion, Imidazoline based inhibitor
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2019
Association for Materials Protection and Performance (AMPP)
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