Effective Inhibition of Carbon Steel Corrosion by Waterborne Polyurethane Based on N- tert -Butyl Diethanolamine in 2M HCl: Experimental and Computational Findings

Yulia F. Zaripova, Sherzod Razhabov, Roman S. Pavelyev, Svetlana S. Vinogradova, Renat R. Nazmutdinov, Iskander R. Vakhitov and Mikhail A. Varfolomeev
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Yulia F. Zaripova: Department of Petroleum Engineering, Kazan Federal University, Kremlevskaya Str. 18, 420008 Kazan, Russia
Sherzod Razhabov: Department of Electrochemical Engineering, Kazan National Research Technological University, Karl Marx Str. 68, 420015 Kazan, Russia
Roman S. Pavelyev: Department of Petroleum Engineering, Kazan Federal University, Kremlevskaya Str. 18, 420008 Kazan, Russia
Svetlana S. Vinogradova: Department of Electrochemical Engineering, Kazan National Research Technological University, Karl Marx Str. 68, 420015 Kazan, Russia
Renat R. Nazmutdinov: Department of Electrochemical Engineering, Kazan National Research Technological University, Karl Marx Str. 68, 420015 Kazan, Russia
Iskander R. Vakhitov: Department of Physics, Kazan Federal University, Kremlevskaya Str. 18, 420008 Kazan, Russia
Mikhail A. Varfolomeev: Department of Petroleum Engineering, Kazan Federal University, Kremlevskaya Str. 18, 420008 Kazan, Russia

Energies, 2022, vol. 15, issue 5, 1-21

Abstract: The efficiency of corrosion inhibition for waterborne polyurethane based on N- tert -butyl diethanolamine ( tB-WPU ) is investigated using different techniques. Corrosion weight loss, open circuit potential experiments, electrochemical impedance spectroscopy, and potentiodynamic polarization measurements show that both a commercial reagent and a polyurethane-based inhibitor prevent corrosion at increasing temperature to 50 °C. At 75 °C, the activity of both reagents is reduced. In stirring conditions, the effectiveness of acid corrosion inhibition (25 °C, 500 ppm) drops abruptly from 89.5% to 60.7%, which is related presumably to the complexity of binding the polymer molecules to the metal surface. As follows from thermodynamic calculations, the adsorption of tB-WPU on the metal surface in 2M HCl can be treated as a physisorption. Model quantum–chemical calculations support the experimental studies and elucidate the nature of steel surface–inhibitor molecule chemical bond, which is realized mainly by carboxyl and amino groups. It is concluded that WPUs can be considered as a perspective alternative to commercial oilfield reagents due to their versatility.

Keywords: corrosion inhibition; acid corrosion; dual-functional inhibitors; carbon steel; waterborne polyurethanes; density functional theory (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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