Imidazoles as highly effective heterocyclic corrosion inhibitors for metals and alloys in aqueous electrolytes: A review (original) (raw)
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2021
Recently, there were reported investigations in the field of corrosion prevention, about finding effective environment-friendly alternative inhibitors, to replace toxic and harmful compounds. In the present review, the corrosion inhibition of some materials in various corrosive media, using imidazole derivatives, is summarized. Several organic compounds reported by many researchers are herein presented. This review considers previous studies conducted on various inhibitors, and provides an overview of some experimental techniques performed in order to investigate their corrosion properties.
Materials and Corrosion, 2019
We report the synthesis and corrosion inhibition performance of two imidazolebased materials, 1,1′-(4-methyl-1,3-phenylene)bis(3-(3-(1H-imidazol-1-yl)propyl)urea) (PIP) and 1,1′-(hexane-1,6-diyl)bis(3-(3-(1H-imidazol-1-yl)propyl) urea) (HIP) dimers, in 1.0 M HCl. Electrochemical assessments indicated that the synthesized dimers facilitated the formation of a protective layer at the metal-electrolyte interface and, as a result, blocked the active corrosion sites. At a concentration of 100 ppm, PIP behaved as a potential mixed-type anticorrosive material with an overall efficiency of 99%. Density functional theory calculations showed that the aromaticity existing in the PIP backbone plays a major role in facilitating the corrosion-inhibition role.
Journal of the Taiwan Institute of Chemical Engineers, 2019
Levamisole (LMS) and 4-phenylimidazole (PIZ), used as corrosion inhibitors of copper in sulfuric acid solution were explored by electrochemical tests, morphology analysis and theoretical calculation. At the concentration of 8 mM, the maximum corrosion inhibition efficiencies of LMS and PIZ are 99.03% and 95.84%, respectively. All test data found that LMS had better corrosion inhibition performance than PIZ. LMS is a cathodic corrosion inhibitor, while PIZ belongs to a mixed-type corrosion inhibitor. Electrochemical results indicate that the corrosion inhibition efficiency has the same trend when the concentration of corrosion inhibitor increases. Scanning electron microscope and atomic force microscope were applied to research the surface morphology of copper samples under different conditions. X-ray photoelectron spectroscopy and Langmuir adsorption isotherm model were utilized to explain adsorption means. What is more, Langmuir adsorption isotherm model indicates the coexistence of physisorption and chemisorption for the two inhibitors. Besides, the adsorption between LMS and copper is more prone to chemical adsorption. The mechanism of metallic copper and corrosion inhibitors was explored through quantum chemistry studies and molecular dynamics simulation.
Iron Corrosion Inhibition by Imidazoles in 3.5% NaCl Medium: Experimental and Theoretical Results
Journal of The Electrochemical Society, 2012
This paper presents experimental and theoretical results concerning the corrosion inhibitor effect of imidazole and five of its derivatives on iron surface. Gravimetric methods and polarization curves were the experimental techniques used in this study. The polarization curves showed that the inhibitors have an anodic role on the electrochemical process. Weight-loss measurements indicated that the adsorption process obeys Langmuir's isotherm. The theoretical study was done using ab initio calculations for the organic molecules and complexes formed between imidazoles and a Fe atom, a Fe 2+ ion, and a Fe 3+ ion. Correlations between structural properties of the compounds and their experimental inhibitor efficiencies were analyzed. A satisfactory correlation between quantum-mechanical parameters and inhibition efficiency was found.
The inhibition effect of synthesized N-((2-(4-methoxyphenyl)H-imidazo[1,2-a]pyridin-3-yl)methylene)benzenamine (MPIPB) on corrosion of N80 steel in 15% HCl solution was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods. The inhibition efficiency increases as the concentration of the inhibitor was increased. The polarization measurements indicate that the studied inhibitor act as mixed inhibitor. The Density function theory (DFT) was employed for theoretical calculations and the obtained results were found to be consistent with the experimental findings
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Inhibitive Action of Imidazoles for Copper Corrosion in Sulfuric Acid Medium
JOURNAL OF ADVANCES IN CHEMISTRY
The corrosion inhibition of copper in the presence of 10-3 M of imidazole derivatives; Imidazole (IM), 2-Methyle imidazole (MIM), Benzimidazole (BIM) has been investigated in 1.0 M H2SO4 solution using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Relationship between molecular structure and their inhibition efficiency was elucidated by quantum chemical calculations using the density functional theory (DFT) at the B3LYP/6-31+G(d,p) level. Inhibition efficiency of these compounds which has been evaluated via experimental methods was accorded with reported theoretical ones, and following the same order as BIM ˃ MIM ˃ IM.
Imidazole derivative as effective oilfield corrosion inhibitor
Corrosion behavior of mild steel immersed in 0.5 M H2SO4 and corrosion inhibition in the presence of different concentrations of 2,4-di-tert-butyl-6-(1h-phenantro[9,10-d]imidazol-2-yl) phenol (PIP) was investigated using weight loss and hydrogen evolution techniques at 303 -333 K. The results indicate a maximum inhibition efficiency of 68.45% in the presence of 10 x 10-5 M PIP at 303 K. The inhibitory action of PIP in the acid solution is best described by Temkin adsorption isotherm. The Arrhenius and transition state equations are used to calculate activation parameters and the mechanism of physical adsorption is proposed for PIP from the values of Ea and ∆G*ads obtained. Thermodynamic studies indicate that the adsorption of PIP to the metal surface is spontaneous. Quantum chemical calculations using DFT is used to calculate some electronic properties of the molecule in order to ascertain any correlation between the inhibitive effect and molecular structure of the molecule PIP. PIP protected the mild steel against corrosion in the acid medium at the studied temperatures by virtue of adsorption. The corrosion rate increased with temperature both in the absence and presence of the inhibitor, but the increase was lesser in the presence of the inhibitor compared to that of the free acid solution. The inhibition efficiency increased with increase in concentration of the inhibitors.