# Electrochemical Corrosion Performance of Aromatic Functionalized Imidazole Inhibitor Under Hydrodynamic Conditions on API X65 Carbon Steel in 1 M HCl Solution

Authors
• 1 King Fahd University of Petroleum and Minerals, Chemistry Department, Dhahran, 31261, Kingdom of Saudi Arabia , Dhahran (Saudi Arabia)
• 2 King Fahd University of Petroleum and Minerals, Mechanical Engineering Department, Dhahran, 31261, Kingdom of Saudi Arabia , Dhahran (Saudi Arabia)
• 3 King Fahd University of Petroleum & Minerals (KFUPM), Center of Research Excellence in Nanotechnology, Dhahran, 31261, Kingdom of Saudi Arabia , Dhahran (Saudi Arabia)
Type
Published Article
Journal
Arabian Journal for Science and Engineering
Publisher
Springer-Verlag
Publication Date
Feb 15, 2019
Volume
44
Issue
6
Pages
5877–5888
Identifiers
DOI: 10.1007/s13369-019-03745-6
Source
Springer Nature
Keywords
The hydrodynamic corrosion inhibitive performance of two imidazole derivatives 2-ethyl-4-methylimidazole and 1-benzylimidazole was investigated on API X65 steel in 1.0 M HCl solution. Structural features of the molecules derived from density functional theory (DFT) calculations at B3LYP/6-31G(d.p) showed that 1-benzylimidazole possess high electron density due to π\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\pi$$\end{document} network which lies flat on the surface and tends to form a stronger interaction with the metal. The addition of the inhibitor molecules in 1 M HCl solution shifted the corrosion potential (Ecorr)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$({E}_{\mathrm{corr}})$$\end{document} in the noble direction. Tafel polarization and electrochemical impedance spectroscopy (EIS) experiments performed at 0–1500 rpm and 50–500 ppm of inhibitor concentration revealed that the corrosion rate was increased with an increase in rotation speed in the absence of inhibitor molecules. However, upon the addition of the inhibitor molecules in the solution minimized the corrosion rate with an efficiency of 82% in the case of 1-benzylimidazole at 500 ppm and 500 rpm electrode rotation. It was concluded that simple imidazole molecules could serve as corrosion inhibitors under extreme hydrodynamic conditions.