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Electrochemical Model of CO2 Corrosion in the Presence of Quaternary Ammonium-type Corrosion Inhibitor Model Compounds

Picture for Electrochemical Model of CO2 Corrosion in the Presence of Quaternary Ammonium-type Corrosion Inhibitor Model Compounds
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The oil and gas industry utilize surfactant-type organic corrosion inhibitors as a way to mitigate internal pipeline corrosion. Changes in corrosion rates due to inhibitor addition have been related to adsorption isotherms as a function of the inhibitor concentration. However the question as to how a corrosion inhibitor affects the electrochemical reactions governing CO2 corrosion remains unclear. This research proposed to investigate the aforementioned question by using a systematic approach: four different corrosion inhibitors synthesized in-house were utilized to determine the effect of the tail length on the activation energy of the electrochemical process underlying the corrosion of an API 5L X65 steel in CO2 corrosion at pH 4. The corrosion inhibitors all contained the same head group (dimethyl-benzyl-ammonium) with four different alkyl tail lengths (C4 C8 C12 and C16). A theoretical description of the increase in the activation energy of the electrochemical process underlying CO2 corrosion due to the presence of the corrosion inhibitors was proposed. Such a description also led to the development of a modified Butler-Volmer equation that describes the retardation in charge transfer rates of the electrochemical reactions associated with the corrosion of mild steel. The model is based upon changes in activation energy calculated by an Arrhenius plot. The model was compared with experimental potentiodynamic sweeps for each corrosion inhibitor model compound. As a result the corrosion model predicts the corrosion rate and the open circuit potential in the presence of a corrosion inhibitor with reasonable accuracy.

Product Number: 51319-13392-SG
Author: Juan Dominguez Olivo
Publication Date: 2019
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