Experimental and Theoretical Studies of the Corrosion Inhibition Performance of a Quaternary Phosphonium-Based Ionic Liquid for Mild Steel in HCl Medium

Lei Guo (), Yue Huang, Yundong Wu, Wei Shi (), Faheem Abbas, Yuanhua Lin, Riadh Marzouki and Xingwen Zheng
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Lei Guo: School of Materials and Chemical Engineering, Tongren University, Tongren 554300, China
Yue Huang: College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China
Yundong Wu: School of Materials and Chemical Engineering, Tongren University, Tongren 554300, China
Wei Shi: College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China
Faheem Abbas: Department of Chemistry, Tsinghua University, Beijing 100084, China
Yuanhua Lin: School of Oil and Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, China
Riadh Marzouki: Chemistry Department, College of Science, King Khalid University, Abha 61413, Saudi Arabia
Xingwen Zheng: School of Chemical and Environmental Engineering, Sichuan University of Science and Engineering, Zigong 643099, China

Sustainability, 2023, vol. 15, issue 4, 1-13

Abstract: The corrosion inhibition performance of a quaternary phosphonium-based ionic liquid, i.e., hexadecyltriphenylphosphonium bromide (HPP), on mild steel in 1 M HCl solution was investigated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) methods. The surface characterization of mild steel was examined by scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS). The results revealed that the inhibition efficiency increases with its increasing concentration, and it can reach up to 99.1% at the concentration of 0.07 mM HPP. PDP data showed that the absorption of HPP conformed to Langmuir adsorption, which served as a mixed-type inhibitor, involving chemisorption and physisorption. SEM analysis confirmed the formation of barrier film on the metal surface, inhibiting the acid attack. Moreover, density functional theory (DFT) calculations and molecular dynamics (MD) simulations were conducted to elucidate the adsorption mechanism of inhibitor molecules on the mild steel surface. A match between the experimental and theoretical findings was evidenced.

Keywords: mild steel; corrosion inhibition; hexadecyltriphenylphosphonium bromide; molecular simulation; electrochemistry (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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