Impact of Fe3O4 on the Performance of an Imidazolinium-Based Inhibitor for Mitigation of CO2 Corrosion of Carbon Steel

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Among the techniques disseminated in the industry to protect carbon steel pipelines against internal corrosion, the use of corrosion inhibitors (CIs) is one of the most common. Organic compounds containing nitrogen are commonly employed in the petroleum industry to decrease corrosion rates. The high inhibition efficiency can be attributed to adsorption capacity on the metallic surface, creating a protective film that interferes with the electrochemical reactions involved in the corrosion processes.

Product Number: 51323-19072-SG

Author: Maria Serenario, Bernardo Santos, Xi Wang, David Young, Marc Singer, Maalek Mohamed-Said, Alysson Helton Santos Bueno

Publication Date: 2023

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Use of corrosion inhibitors to mitigate pipeline corrosion is common in the oil and gas industry. Despite this, few studies focus on how the presence of corrosion products affect their performance. This work aimed to understand the impact of Fe3O4 on the performance of a commercial primarily imidazolinium-based corrosion inhibitor formulation. A magnetite layer was formed in an autoclave at a high temperature (1 wt.% NaCl, N2 sparged, pH 4, 120°C). The performance of the corrosion inhibitor was investigated with and without the presence of Fe3O4 (5 wt.% NaCl, CO2, pH 4.5, 55°C). Linear polarization resistance (LPR) and potentiodynamic polarization were employed to study the effect of Fe3O4 on corrosion rate (CR) and inhibition efficiency (IE). Scanning electron microscopy (SEM) and Raman spectroscopy were used to characterize specimen surfaces. The acquired data showed that the presence of magnetite limited inhibitor performance. Dissolution of the magnetite layer over time in the CO2 environment was also observed. This behavior was expected as the experiments were performed in non-thermodynamically favorable conditions for magnetite formation. Polarization sweeps indicated that the cathodic charge transfer and the limiting current of the H+ reduction reaction were significantly accelerated due to the Fe3O4 layer. This behavior can be explained by the increase in cathodic reaction area due to the conductive nature of magnetite.