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Development of Methodology for Corrosion Inhibitor Characterization

Picture for Development of Methodology for Corrosion Inhibitor Characterization
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Product Number: 51321-16443-SG
Author: Shuai Ren,/Yi He/ Zineb Belarbi/ Xi Wang/ David Young/ Marc Singer/Maalek Mohamed-Saïd/Sheyla Camperos
Publication Date: 2021
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Organic corrosion inhibitors (CIs) are widely employed in the oil and gas industry to protect carbon steel pipelines against internal corrosion. Inhibitor selection by corrosion engineers frequently relies on long testing procedures and protocols, which requires significant time and expenditure. This study aims at providing a simpler and more reliable methodology for inhibitor characterization, which can contribute to inhibitor selection in the oil and gas industry. Two model compounds, tetradecyl phosphate ester (TPE) and tetradecyl tetrahydropyrimidinium (TTHP), were chosen for this methodology development in an aqueous environment of 5 wt.% NaCl (pH = 4.5) at 25°C. Linear polarization resistance (LPR) measurements were conducted to determine the corrosion rate (CR) over a wide range of CI concentrations, from which surface saturation concentration and surface coverage (θ) values were extracted. Kinetic parameters for adsorption (kA, kD, and KAD) were obtained by means of Langmuir adsorption isotherm and non-linear regression analysis. Potentiodynamic polarizations were executed to analyze the inhibition behaviors. It is concluded that both TPE and TTHP could retard anodic and cathodic reactions with no change in limiting current.

Keywords: corrosion inhibitors, phosphate ester, tetrahydropyrimidinium, surface saturation concentration, adsorption kinetics

Organic corrosion inhibitors (CIs) are widely employed in the oil and gas industry to protect carbon steel pipelines against internal corrosion. Inhibitor selection by corrosion engineers frequently relies on long testing procedures and protocols, which requires significant time and expenditure. This study aims at providing a simpler and more reliable methodology for inhibitor characterization, which can contribute to inhibitor selection in the oil and gas industry. Two model compounds, tetradecyl phosphate ester (TPE) and tetradecyl tetrahydropyrimidinium (TTHP), were chosen for this methodology development in an aqueous environment of 5 wt.% NaCl (pH = 4.5) at 25°C. Linear polarization resistance (LPR) measurements were conducted to determine the corrosion rate (CR) over a wide range of CI concentrations, from which surface saturation concentration and surface coverage (θ) values were extracted. Kinetic parameters for adsorption (kA, kD, and KAD) were obtained by means of Langmuir adsorption isotherm and non-linear regression analysis. Potentiodynamic polarizations were executed to analyze the inhibition behaviors. It is concluded that both TPE and TTHP could retard anodic and cathodic reactions with no change in limiting current.

Keywords: corrosion inhibitors, phosphate ester, tetrahydropyrimidinium, surface saturation concentration, adsorption kinetics

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