Phosphonium iodine as nickel corrosion inhibitor in 1 M sulfuric acid medium

Said, Fatima; Souissi, Nabil; Es-Salah, Karima; Hajjaji, Najat; Triki, E.; Srhiri, A.

doi:10.1007/s10853-007-1640-8

Cited by 9 publications

(7 citation statements)

References 16 publications

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“…The absence of significant change in the Tafel slopes in the presence of inhibitor indicates that the corrosion mechanism is not changed after adding the inhibitor and the inhibitive effect is attributed to simple adsorption. These results indicate that the electrochemical process at the Nickel-HNO 3 interface is controlled by activation kinetics [14]. The inhibition efficiency, IE(%), was evaluated from the measured i corr values using the relationship:…”

Section: Tafel Extrapolation Methodsmentioning

confidence: 94%

“…The anodic curve corresponds to the electrochemical generation of nickel oxides and/or nitrates. A surface steady state appears indicating that the corrosion products formed at the electrode surface allowed pseudo-passivation of the material [14]. This may account for the appearance of the passivation plateau in the anodic domain.…”

Section: Tafel Extrapolation Methodsmentioning

confidence: 94%

“…This may account for the appearance of the passivation plateau in the anodic domain. The cathodic domain is due to hydrogen evolution under kinetic-control [14]. The values of the corrosion current density (i corr ) for nickel corrosion reaction without and with inhibitors were determined by extrapolation of the cathodic and anodic Tafel lines to the corrosion potential (E corr ).…”

Section: Tafel Extrapolation Methodsmentioning

confidence: 99%

“…[13]. The inhibiting action of alkyl triphenyl phosphonium iodine salt towards the corrosion behaviour of nickel in 1 M H 2 SO 4 solution has been studied [14] This compound was found to retard both the anodic and cathodic reactions of nickel corrosion.…”

Section: Introductionmentioning

confidence: 99%

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Computational and electrochemical investigation for corrosion inhibition of nickel in molar nitric acid by piperidines

Khaled

Amin

2008

J Appl Electrochem

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The adsorption and corrosion inhibition behaviour of four selected piperidine derivatives, namely piperidine (pip), 2-methylpiperidine (2mp), 3-methylpiperidine (3mp), and 4-methylpiperidine (4mp) at nickel in 1.0 M HNO 3 solution were studied computationally by the molecular dynamics simulation and quantum chemical calculations and electrochemically by Tafel and impedance methods. The results indicate a strong dependence of the inhibition performance on the nature of the metal surface, in addition to the structural effects of piperidines. Inhibition is accomplished by adsorption of piperidines on the metal surface without detectable changes in the chemistry of corrosion. Adsorption is predominantly chemisorptive in the active region and by hydrogen bond formation in the passive region. The potential of zero charge (PZC) of the nickel electrode was determined in 1.0 M HNO 3 solutions in the absence and presence of 10 -2 M 2mp, and the electrostatic (physical) adsorption was discussed. The inhibition efficiency of these compounds increases in the order: 4mp [ 3mp [ 2mp [ pip. Molecular simulation studies were applied to optimize the adsorption structures of piperidine derivatives. The nickel/inhibitor/solvent interfaces were simulated and the charges on the inhibitor molecules as well as their structural parameters were calculated in the presence of solvent effects. Quantum chemical calculations based on the ab initio method were performed to determine the relationship between the molecular structure of piperidines and their inhibition efficiency. Results obtained from Tafel and impedance methods are in good agreement and confirm theoretical studies.

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Section: Tafel Extrapolation Methodsmentioning

confidence: 94%

Section: Tafel Extrapolation Methodsmentioning

confidence: 94%

Section: Tafel Extrapolation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Computational and electrochemical investigation for corrosion inhibition of nickel in molar nitric acid by piperidines

Khaled

Amin

2008

J Appl Electrochem

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“…One of the useful methods of controlling the corrosion process is the addition of inhibitors. Several researches were found in the literature about the use of inhibitors for nickel dissolution in acidic solution [6][7][8][9][10][11][12][13][14]. The aim of this paper is to investigate the effect of three β-aminoketone derivatives as inhibitors for corrosion of nickel in hydrochloric acid solution, to throw some light on the mechanism of corrosion and to calculate some quantum quantities.…”

Section: Introductionmentioning

confidence: 99%

Some beta-Aminoketone Derivatives as Corrosion Inhibitors for Nickel in Hydrochloric Acid Solution

Elewady¹,

El-Askalany²,

Molouk³

2007

Port. Electrochim. Acta

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The use of some β-aminoketone derivatives as corrosion inhibitors for nickel in 2 M acid chloride solution was investigated by gravimetric and galvanostatic polarization techniques. It was found that the investigated compounds behave as inhibitors for nickel dissolution and their inhibition efficiencies increase by the addition of iodide ions. Also, the adsorption isotherms were studied and it was found to follow the Frumkin's adsorption isotherm. By increasing the temperature of the corrosive medium containing different concentrations of the tested inhibitors, the corrosion rate of nickel increases, indicating that these inhibitors are physically adsorbed on the metal surface. Finally, some quantum chemical quantities such as HOMO, LUMO and dipole moment of the inhibitors were calculated and correlated with the rate of corrosion.

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Molecular modeling and electrochemical investigations of the corrosion inhibition of nickel using some thiosemicarbazone derivatives

Khaled

2011

J Appl Electrochem

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A relationship between molecular structures of three thiosemicarbazone derivatives and their inhibition capability was studied using electrochemical measurements (potentiodynamic polarization and EIS), molecular dynamics method and quantum chemical calculations. Electrochemical measurements results revealed that the inhibition efficiencies increased with the concentration of inhibitors. The molecular dynamic method results showed that the higher binding energy between the inhibitor and metal surface, the higher the adsorption energy and the higher the inhibition efficiency. Thiosemicarbazone derivatives have been simulated as adsorbate on Ni(111) substrate and the adsorption density, adsorption energy and binding energy have been identified on nickel surface.

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Phosphonium iodine as nickel corrosion inhibitor in 1 M sulfuric acid medium

Cited by 9 publications

References 16 publications

Computational and electrochemical investigation for corrosion inhibition of nickel in molar nitric acid by piperidines

Computational and electrochemical investigation for corrosion inhibition of nickel in molar nitric acid by piperidines

Some beta-Aminoketone Derivatives as Corrosion Inhibitors for Nickel in Hydrochloric Acid Solution

Molecular modeling and electrochemical investigations of the corrosion inhibition of nickel using some thiosemicarbazone derivatives

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