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Corrosion Inhibitors for Carbon Steels Exposed to Aqueous CO2

CO2 corrosion mitigation is a challenge in the oil and gas industry. In order to decrease the severity of CO2 corrosion of carbon steel pipelines and equipment different mitigation practices are recommended. One such strategy is the application of surface active chemical inhibitors. The objective of this study was to evaluate the inhibition effectiveness of thioglycolic acid 2-mercaptoethanol and decanethiol in a CO2-saturated aqueous electrolyte (1 wt.% NaCl). The inhibition properties of corrosion inhibitor were evaluated by electrochemical measurements (linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS)) and the steel surface characterized by scanning electron microscopy (SEM). In addition surface characterization of adsorbed decanethiol molecules on carbon steel was performed using X-ray photoelectron spectroscopy (XPS). The obtained data show that decanethiol successfully prevents corrosion of carbon steels in a CO2 environment. An inhibition mechanism was also proposed based on adsorption characteristics and film formation.

Product Number: 51319-13184-SG
Author: Zineb Belarbi
Publication Date: 2019
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