On the Potential/pH Diagrams of the Cu-NH[sub 3]-H[sub 2]O and Zn-NH[sub 3]-H[sub 2]O Systems

Johnson, H. E.; Leja, J.

doi:10.1149/1.2423629

Cited by 66 publications

(12 citation statements)

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“…The inhibitory mechanism on copper dissolution is related to the chelating effect of Cu 2þ ions close to copper surface. Indeed, it is proven [45,46] that copper is corroded to Cu 2þ in HNO 3 solution and no oxide film is formed to protect the surface from corrosion. Examining Fig.…”

Section: Quantum Chemistry Studiesmentioning

confidence: 99%

Correlation between the molecular structure and the inhibiting effect of some benzimidazole derivatives

Niamien

Fodjo

Trokourey

et al. 2012

Materials Chemistry and Physics

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Section: Quantum Chemistry Studiesmentioning

confidence: 99%

Correlation between the molecular structure and the inhibiting effect of some benzimidazole derivatives

Niamien

Fodjo

Trokourey

et al. 2012

Materials Chemistry and Physics

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“…The energetic barrier is lower, facilitating the formation of Cu 2+ ions which interact with the studied inhibitors to form a protective film [36]. Indeed it is proven that copper is corroded in Cu 2+ in HNO 3 solution, and no oxide film is formed to protect the surface from corrosion [37,38]. So in HNO 3 solution the following reactions occur:…”

Section: Effect Of the Inhibitors Concentration On The Inhibitingmentioning

confidence: 99%

“…The inhibitory mechanism on copper dissolution is related to the chelating effect of Cu 2+ ions close to copper surface. Indeed, it is proven that copper is corroded to Cu 2+ in HNO 3 solution and no oxide film is formed to protect the surface from corrosion [37,38]. It is also known that the organic compounds can be adsorbed by the interactions between the lone pairs of electrons of nitrogen, sulfur, or oxygen atoms with metal surface.…”

Section: Mechanism Of Inhibitionmentioning

confidence: 99%

Copper Corrosion Inhibition in 1 M HNO3 by Two Benzimidazole Derivatives

Niamien

Kouassi

Trokourey

et al. 2012

ISRN Materials Science

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Corrosion behavior of copper in 1 M nitric acid containing either 2-mercaptobenzimidazole (MBI) or 2-thiomethylbenzimidazole (TMBI) was investigated experimentally and theoretically via weight loss method and quantum chemical approaches. It was found that the two compounds exhibit a very good performance as inhibitors for copper corrosion in the studied medium. Results show that the inhibition efficiencies increase with increasing temperature and increasing concentration of the inhibitors. It has been found that the studied compounds adsorb onto copper according to the modified Langmuir adsorption isotherm and the kinetic/thermodynamic isotherm of El-Awady. The thermodynamic adsorption parameters and kinetic corrosion parameters were determined and analyzed; on the bases of these parameters both physisorption and chemisorption were suggested for the studied compounds. Furthermore, the quantum chemical properties/descriptors most relevant to their potential action as corrosion inhibitors have been calculated. They include E HOMO , E LUMO , energy gap (ΔE), dipole moment (μ), hardness (η), softness (σ), the fractions of electrons transferred (ΔN), electrophilicity index (ω), and the total energy change (ΔE T ). The theoretical results were found to be consistent with the experimental data reported.

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“…The magnitudes of free energy of adsorptions indicate that these molecules interact on the metal surface through both physisorption and chemisorptions [23]. [27,28] has revealed that the copper is corroded to Cu 2+ in nitric acid solutions. Though the chance for the formation of oxide film is rare in acidic medium, it is forced to believe that appreciable oxide layer is present on the surface due to very low value of corrosion current density and high value of impedance in the absence of inhibitor.…”

Section: Adsorption Isothermmentioning

confidence: 99%

Interaction of Two Water Soluble Heterocyclic Hydrazones on Copper in Nitric Acid: Electrochemical, Surface Morphological, and Quantum Chemical Investigations

Raphael

Kakkassery

Shanmughan

et al. 2016

International Journal of Metals

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Two novel heterocyclic compounds (E)-2-(1-(pyridin-3-yl)ethylidene)hydrazinecarbothioamide (3APTSC) and (E)-3-(1-(2-phenylhydrazono)ethyl)pyridine (3APPH) derived from 1-(pyridin-3-yl)ethanone were synthesized and characterized by various spectroscopic techniques. The corrosion inhibition efficacies of these compounds on copper in 0.1 M HNO 3 were screened by electrochemical corrosion monitoring techniques such as potentiodynamic polarization studies and impedance spectroscopy. Investigations clearly established that 3APPH displayed higher corrosion inhibition efficiency on Cu than 3APTSC at all concentrations. The mechanism of inhibition was verified with the help of adsorption isotherms. 3APTSC and 3APPH obeyed Langmuir adsorption isotherm on Cu surface. Thermodynamic parameters such as adsorption equilibrium constant ( ads ) and free energy of adsorption (Δ ads ) were also evaluated. Potentiodynamic polarization investigations confirmed that the 3APTSC and 3APPH act as mixed type inhibitors. Surface analysis of the metal specimens was performed by scanning electron microscopy. Energy of HOMO and LUMO, their difference, number of electrons transferred, electronegativity, chemical hardness, and so forth were evaluated by quantum chemical studies. Agreeable correlation was observed between the results of quantum chemical calculations and other corrosion monitoring techniques.

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On the Potential/pH Diagrams of the Cu-NH[sub 3]-H[sub 2]O and Zn-NH[sub 3]-H[sub 2]O Systems

Abstract: not Available.

Cited by 66 publications

References 0 publications

Correlation between the molecular structure and the inhibiting effect of some benzimidazole derivatives

Correlation between the molecular structure and the inhibiting effect of some benzimidazole derivatives

Copper Corrosion Inhibition in 1 M HNO3 by Two Benzimidazole Derivatives

Interaction of Two Water Soluble Heterocyclic Hydrazones on Copper in Nitric Acid: Electrochemical, Surface Morphological, and Quantum Chemical Investigations

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