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Study of Adsorption of Corrosion Inhibitor on Carbon Steel Under Co2 Environment by Using AFM

Adsorption/desorption process of 1-(2-aminoethyl)-2-oleyl-2-imidazolinium chloride on carbon steel. To study adsorption of imidazolinium chloride on carbon steel, in-situ atomic force microscopy measurements were performed in air, with and without imidazolinium chloride, in a 1 wt% NaCl solution purged with CO2 at pH 4.

Product Number: 51317--9290-SG
ISBN: 9290 2017 CP
Author: Zineb Belarbi
Publication Date: 2017
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The most common corrosion inhibitors used to minimize corrosion of carbon steel in the oil and gas industry contain imidazoline molecules. However the behavior of imidazoline molecules at the interface remains poorly understood especially for the adhesive and cohesive forces of inhibitor films. The objective of this work is to understand the adsorption/desorption process of talloil diethylenetriamine imidazoline (TOFA/DETA imidazoline) on carbon steel. In order to study adsorption of TOFA/DETA imidazoline on carbon steel insitu AFM measurements were performed on mild steel in air then mild steel in deoxygenated 1 wt% NaCl solution at pH around 7 then with imidazoline in 1 wt% NaCl solution purged with CO2 at pH 4. For comparison to the aggressive CO2 environment the inhibition behavior of TOFA/DETA imidazoline was monitored in less corrosive N2-saturated solutions. In-situ AFM visualization confirmed the formation of inhibitor film on carbon steel surface immersed in CO2-saturated solution resulting in a decrease in corrosion rates as determined by electrochemical measurements. Quantitative force measurements were also performed to evaluate the mechanical and adhesion properties of inhibitor film adsorbed on carbon steel. The adsorption and subsequent formation of corrosion inhibitor film at different environmental conditions was also examined using molecular simulations.

Keywords: CO2 corrosion, imidazoline, AFM, inhibition, carbon steel, CO2 corrosion

The most common corrosion inhibitors used to minimize corrosion of carbon steel in the oil and gas industry contain imidazoline molecules. However the behavior of imidazoline molecules at the interface remains poorly understood especially for the adhesive and cohesive forces of inhibitor films. The objective of this work is to understand the adsorption/desorption process of talloil diethylenetriamine imidazoline (TOFA/DETA imidazoline) on carbon steel. In order to study adsorption of TOFA/DETA imidazoline on carbon steel insitu AFM measurements were performed on mild steel in air then mild steel in deoxygenated 1 wt% NaCl solution at pH around 7 then with imidazoline in 1 wt% NaCl solution purged with CO2 at pH 4. For comparison to the aggressive CO2 environment the inhibition behavior of TOFA/DETA imidazoline was monitored in less corrosive N2-saturated solutions. In-situ AFM visualization confirmed the formation of inhibitor film on carbon steel surface immersed in CO2-saturated solution resulting in a decrease in corrosion rates as determined by electrochemical measurements. Quantitative force measurements were also performed to evaluate the mechanical and adhesion properties of inhibitor film adsorbed on carbon steel. The adsorption and subsequent formation of corrosion inhibitor film at different environmental conditions was also examined using molecular simulations.

Keywords: CO2 corrosion, imidazoline, AFM, inhibition, carbon steel, CO2 corrosion

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