The corrosion inhibition effect of aryl pyrazolo pyridines on copper in hydrochloric acid system: computational and electrochemical studies

Sudheer, _; Quraishi, M.A.

doi:10.1039/c5ra03966e

Cited by 35 publications

(10 citation statements)

References 36 publications

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“…7c. A careful examination of the Bode plot reveals that the value of log|Z| and the phase angle fall to zero in the high-frequency region, which is a characteristic resistive response to the solution resistance enclosed between the working electrode and the reference electrode [39,40]. However, in the intermittent frequency region, the Bode plots give a linear relationship between log|Z| and log f, with a slope near −1 and a phase angle value close to −70 • , which appears to be a capacitive response of mild steel in acid solution.…”

Section: Electrochemical Impedance Studiesmentioning

confidence: 99%

5-Substituted 1H-tetrazoles as effective corrosion inhibitors for mild steel in 1 M hydrochloric acid

Verma

Quraishi

Singh

2016

Journal of Taibah University for Science

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The corrosion inhibition efficiency of (E)-3-phenyl-2-(1H-tetrazole-5-yl)acrylonitrile (PTA), (E)-3-(4-nitrophenyl)-2-(1Htetrazole-5-yl)acrylonitrile (NTA), and (E)-3-(4-hydroxyphenyl)-2-(1H-tetrazole-5-yl)acrylonitrile (HTA) on mild steel in 1 M HCl was tested using experimental and theoretical methods. The results show that the inhibition efficiency increases with the increasing concentration, and maximum values were obtained at a 40 mg L −1 concentration. The inhibition efficiency of the studied inhibitors follows the order HTA (98.69%) > NTA (96.60%) > PTA (93.99%). Polarization studies suggest that the tetrazoles behave as cathodic inhibitors. The adsorption of the tetrazoles on the mild steel surface obeys the Langmuir adsorption isotherm. In the present study, the values of the free energy of adsorption (− G 0 ads) vary from 34.92 to 39.71 kJ mol −1. The adsorption of the tetrazoles on the mild steel surface is supported by SEM, EDX and AFM studies. Quantum chemical calculations provide good support to the experimental results.

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Section: Electrochemical Impedance Studiesmentioning

confidence: 99%

5-Substituted 1H-tetrazoles as effective corrosion inhibitors for mild steel in 1 M hydrochloric acid

Verma

Quraishi

Singh

2016

Journal of Taibah University for Science

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“…1 − 5 Gemini surfactants (GSs) provide unique performance in terms of their critical micelle concentrations (CMCs), solubility in water, and interface properties. 6 − 11 GSs provide high efficiency compared to their corresponding monomer counterparts either in reducing solution surface tension or in micelle formation. GSs are made up of two surfactant monomers that are covalently bonded together by either a hard or a flexible spacer group.…”

Section: Introductionmentioning

confidence: 99%

Anticorrosion Study for Brass Alloys in Heat Exchangers during Acid Cleaning Using Novel Gemini Surfactants Based on Benzalkonium Tetrafluoroborate

et al. 2022

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For a variety of applications, the brass alloy has been utilized to replace titanium tubes in heat exchangers. Copper alloys’ high corrosion rate during the acid cleaning procedure remains a significant concern. To inhibit the corrosion of brass alloys, we prepared two novel gemini surfactants (GSs), N 1 , N 3 -dibenzyl- N 1 , N 1 , N 3 , N 3 -tetramethylpropane-1,3-diaminium tetrafluoroborate (I H) and N 1 , N 1 , N 3 , N 3 -tetramethyl- N 1 , N 3 -bis (4-methyl benzyl) propane-1,3-diaminium tetrafluoroborate (I Me), and they were characterized using Fourier transform infrared spectroscopy and 1 H nuclear magnetic resonance spectroscopy. Their inhibition performance against corrosion of brass alloys in 1 M HCl was studied using electrochemical techniques including potentiodynamic polarization (PP), electrochemical impedance spectroscopy, and electrochemical frequency modulation. The inhibition effect of the synthesized compounds was high, and it increased as the inhibitor’s concentration was increased. The maximum level of inhibition efficiency was achieved at an inhibitor concentration of 100 ppm, reaching 96.42% according to PP measurements. From Langmuir data, the mechanisms of adsorption of the two GSs on the surface of copper was found to be physisorption and chemisorption adsorption. X-ray photoelectron spectroscopy and scanning electron microscopy show that the addition of the two compounds lowers the dissolution of brass ions in the corrosive solution and forms a protective layer on the surface of the brass.

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“…The literature survey reveals that several pyridine derivatives were used as corrosion inhibitors, but they were effective at higher inhibitor concentrations. [ 19–23 ] It is well‐known that the organic molecule adsorbed at the metal‐solution interface by forming coordination bonds with empty metal orbits [ 24 ] and the mode of adsorption is dependent on (i) the chemical structure of the molecule, (ii) the chemical composition of the solution, (iii) the nature of the metal surface, and (iv) the electrochemical potential of the metal‐solution interface. [ 25 ] Pyridine derivatives were used to control the corrosion of steel in HCl solution and their adsorption mechanism was examined.…”

Section: Introductionmentioning

confidence: 99%

“…[ 30 ] Aryl pyrazolo pyridine showed relatively high inhibition efficiency for copper corrosion in HCl solution. [ 23 ]…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the inhibition effect of novel cyclohepta[b]pyridine derivatives for copper corrosion and theoretical calculations

Fathi

Anouar

Soliman

et al. 2021

J of Physical Organic Chem

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The inhibiting effect of three prepared derivatives of 4‐(4‐Hydroxy‐3‐methoxyphenyl)‐6,7,8,9‐tetrahydro‐5H‐cyclohepta[b]pyridine on the corrosion of copper in 0.6 M NaCl (3.5%) were investigated by different electrochemical techniques and density functional theory (DFT) calculations. The electrochemical results indicated that the inhibition efficiency increased with the increase of the inhibitors concentrations till a certain concentration then nearly became constant. 4‐(4‐hydroxy‐3‐methoxyphenyl)‐2‐mercapto‐6,7,8,9‐tetrahydro‐5H‐cyclohepta[b]pyridine‐3‐carbonitrile (C2) represented the best inhibition efficiency of 98.4% at 50 ppm. The polarization measurements revealed that the studied compounds C1‐C3 acted as mixed inhibitors. The adsorption of 2‐hydroxy‐4‐(4‐hydroxy‐3‐methoxyphenyl)‐6,7,8,9‐tetrahydro‐5H‐cyclohepta[b]pyridine‐3‐carbonitrile (C1) on the copper surface obeyed Freundlich isotherm while the other two inhibitors obeyed Langmuir isotherm. Relatively, a good correlation was obtained between the observed inhibition efficiencies from one side, and the electronic and molecular descriptors from another side.

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The corrosion inhibition effect of aryl pyrazolo pyridines on copper in hydrochloric acid system: computational and electrochemical studies

Abstract: The inhibition effect of three aryl pyrazole pyridine derivatives (APPs) against the corrosion of copper in 0.5 M HCl has been investigated by electrochemical impedance, potentiodynamic polarization measurements and quantum chemical methods.

Cited by 35 publications

References 36 publications

5-Substituted 1H-tetrazoles as effective corrosion inhibitors for mild steel in 1 M hydrochloric acid

5-Substituted 1H-tetrazoles as effective corrosion inhibitors for mild steel in 1 M hydrochloric acid

Anticorrosion Study for Brass Alloys in Heat Exchangers during Acid Cleaning Using Novel Gemini Surfactants Based on Benzalkonium Tetrafluoroborate

Evaluation of the inhibition effect of novel cyclohepta[b]pyridine derivatives for copper corrosion and theoretical calculations

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