Comparative study of organic inhibitors of coppercorrosion

Cicileo, G. P.; Rosales, B.M.; Varela, F.E.; Vilche, J. R.

doi:10.1016/s0010-938x(98)00190-5

Cited by 80 publications

(36 citation statements)

References 13 publications

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“…From Table 1 it can be seen that, in general, values of the apparent activation energy E a for the inhibited solutions are lower than that for the uninhibited one, indicating a chemisorption process of adsorption [35]. 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].…”

Section: Effect Of the Inhibitors Concentration On The Inhibitingmentioning

confidence: 95%

“…Recently, it was found that the formation of donoracceptor surface complexes between free electrons of an inhibitor and a vacant d orbital of a metal is responsible for the inhibition corrosion process [54]. The number of Cu 2+ ions in proximity of copper increases with increasing temperature, leading to the formation of Cu 2+ -inhibitor complexes protective film (increase in surface coverage) which create a physical barrier between Cu surface and the electrolyte, retarding the dissolution of the metal [36]. The inhibition efficiency is then enhanced with increase in temperature.…”

Section: Mechanism Of Inhibitionmentioning

confidence: 99%

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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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Section: Effect Of the Inhibitors Concentration On The Inhibitingmentioning

confidence: 95%

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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“…Consequently, much of the recent research has concentrated on formulating new and more environmentally acceptable polymeric-type coatings. For example, Cicileo et al [5] have shown that oxime compounds, such as benzoinoxime and salycilaldoxime lead to the formation of a polymeric Cu(II) Á/ inhibitor complex that exhibits strong corrosion inhibition. Guenbour et al [6] have studied the corrosion protection of copper by polyaminophenol films obtained through the electropolymerization of the monomer, 2-aminophenol, in alkaline hydroalcoholic solution.…”

Section: Introductionmentioning

confidence: 99%

The electrochemical synthesis of polypyrrole at a copper electrode: corrosion protection properties

Fenelon

Breslin

2002

Electrochimica Acta

173

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Pyrrole was successfully electropolymerized at a copper electrode in a near neutral sodium oxalate solution to generate a homogeneous and adherent polypyrrole film. The growth of these films was facilitated by the initial oxidation of the copper electrode in the oxalate solution to generate a copper oxalate pseudo-passive layer. This layer was sufficiently protective to inhibit further dissolution of the copper electrode and sufficiently conductive to enable the electropolymerization of pyrrole at the interface, and the generation of an adherent polypyrrole film. These films remained stable and conducting for periods exceeding eight days and exhibited significant corrosion protection properties in acidified and neutral 0.1 mol dm (3 NaCl solutions even on polarization to high anodic potentials. #

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“…From these observations, it is concluded that the outermost corrosion product is Cu 2 O. e C 1s peaks at 284.6 eV, 285.5 eV, and 287.6 eV are due to contaminant carbon, which is likely due to the cracking of vacuum oil used during the operation of XPS instrument [46]. e survey scan of the �lm formed on Cu-Ni (90/10) alloy in 10 ppm sulphide containing seawater in the absence of BTAH also shows the peaks due to copper, oxygen, and carbon.…”

Section: X-ray Photoelectron Spectroscopic Studies (Xpss)mentioning

confidence: 97%

Corrosion Inhibition of Cu-Ni (90/10) Alloy in Seawater and Sulphide-Polluted Seawater Environments by 1,2,3-Benzotriazole

Boyapati

Kanukula

2013

ISRN Corrosion

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e inhibiting effect of 1,2,3-benzotriazole (BTAH) against the corrosion of Cu-Ni (90/10) alloy in seawater and seawater polluted with inorganic sulphide was studied by electrochemical impedance studies (EISs), potentiodynamic polarization studies, and cyclic voltammetric (CV) and weight-loss studies. Surface examination studies were carried out by X-ray photo electron spectroscopy (XPS) and scanning electron microscopy (SEM)/energy dispersive X-ray analysis (EDX). EIS studies have been carried out in seawater and 10 ppm of inorganic sulphide containing seawater in the absence and presence of BTAH at different concentrations, different immersion periods, and at different temperatures. Appropriate equivalent circuit model was used to calculate the impedance parameters. e potentiodynamic polarization studies inferred that BTAH functions as a mixed inhibitor. e impedance, polarization, and weight-loss studies showed that the inhibition efficiency of BTAH is in the range between 99.97 and 99.30% under different conditions. Cyclic voltammeric studies show the stability of the protective BTAH �lm even at anodic potentials of +550 mV versus Ag/AgCl. All these studies infer that BTAH functions as an excellent inhibitor for Cu-Ni (90/10) alloy in seawater and sulphide-polluted seawater. XPS and SEM-EDX studies con�rm the presence of protective BTAH �lm on the alloy surface.

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Comparative study of organic inhibitors of coppercorrosion

Cited by 80 publications

References 13 publications

Copper Corrosion Inhibition in 1 M HNO3 by Two Benzimidazole Derivatives

Copper Corrosion Inhibition in 1 M HNO3 by Two Benzimidazole Derivatives

The electrochemical synthesis of polypyrrole at a copper electrode: corrosion protection properties

Corrosion Inhibition of Cu-Ni (90/10) Alloy in Seawater and Sulphide-Polluted Seawater Environments by 1,2,3-Benzotriazole

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