An ellipsometric study of anodic passivation of nickel in borate buffer solution

Satô, Norio; Kudô, Kiyokatsu

doi:10.1016/0013-4686(74)87025-8

Cited by 108 publications

(54 citation statements)

References 26 publications

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“…These complex plane plots have all the same semicircular shape which may correspond to a large diameter charge-transfer dominated region with some diffusion control, as found in other corrosion systems [29]. This form of impedance is consistent with the occurrence of a charge transfer reaction in a porous film of finite thickness [30], although oxygen evolution occurring within a thick porous outer layer may exhibit such behaviour [31]. It can be observed that an increase in temperature reduces the amplitude of the semicircle, indicating a decrease of the total impedance of the system and a loss in the protective properties of the passive film.…”

Section: Eis Measurementssupporting

confidence: 73%

Corrosion Behaviour of a Highly Alloyed Austenitic Alloy UB6 in Contaminated Phosphoric Acid

Boudalia

Guenbour

Bellaouchou

et al. 2013

International Journal of Corrosion

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The influence of temperature ∘ C) on the electrochemical behaviour of passive films anodically formed on UB6 stainless steel in phosphoric acid solution (5.5 M H 3 PO 4 ) has been examined by using potentiodynamic curves, electrochemical impedance spectroscopy, and Mott-Schottky analysis. UB6 stainless steel in contaminated phosphoric acid is characterised by high interfacial impedance, thereby, illustrating its high corrosion resistance. The obtained results show that the films behave as n-type and p-type semiconductors in the potential range above and below the flat band potential, respectively. This behaviour is assumed to be the consequence of the semiconducting properties of the iron oxide and chromium oxide regions which compose the passive film.

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Section: Eis Measurementssupporting

confidence: 73%

Corrosion Behaviour of a Highly Alloyed Austenitic Alloy UB6 in Contaminated Phosphoric Acid

Boudalia

Guenbour

Bellaouchou

et al. 2013

International Journal of Corrosion

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show abstract

“…The electrochemical cell was kept at constant temperature (30 ± 0.1 o C) using an ultra thermostat. From galvanostatic polarization data the percentage inhibition efficiency (%IE) and degree of surface coverage (θ) were calculated from the following equations (4) where i free and i inh. are the corrosion current densities in absence and presence of inhibitor, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The corrosion resistance of nickel is due to the formation of a passive film on its surface upon exposure to the corrosive media. Many works were conducted to study the passivation of nickel in acidic solutions [1][2][3][4][5]. However, the obtained results showed that nickel establishes a kind of passivity in acidic solutions in which the corrosion current, in the passive potential range, is somewhat higher than those recorded by other passive metals.…”

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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“…Nevertheless, nickel could be attacked by acidic media in a considerable rate. Many works were conducted to study the passivation of nickel in different acidic solutions [1][2][3][4][5]. It was reported that the passive film formed on nickel surface in low concentrations of sulfuric acid is NiOOH [3] or NiO and Ni 2 O 3 [4].…”

Section: Introductionmentioning

confidence: 99%

“…Many works were conducted to study the passivation of nickel in different acidic solutions [1][2][3][4][5]. It was reported that the passive film formed on nickel surface in low concentrations of sulfuric acid is NiOOH [3] or NiO and Ni 2 O 3 [4]. On the other hand, β-NiSO 4 .6H 2 O was suggested as the passive compound formed in very high concentrations of sulfuric acid [5].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Inhibition of Nickel in Sulfuric Acid Using Tween Surfactants

Abdallah¹,

El‐Etre²

2003

Port. Electrochim. Acta

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Four commercial non-ionic surfactant compounds, namely tween 80, 60, 40 and 20, were tested as inhibitors for corrosion of nickel in 1.0 M H 2 SO 4 solution. Weight loss measurements, potentiostatic polarization and cyclic voltammetry techniques were used in this study. It was found that all the four used compounds act as good inhibitors for acid corrosion of nickel. The inhibition efficiencies obtained by the three techniques were almost the same, and increase with increasing the hydrocarbon chain length, the presence of a double bond in the chemical structure of the surfactant and with increasing the surfactant concentration. The polarization studies show that tween compounds act as mixed inhibitors. The inhibition action of these surfactants is interpreted in view of their adsorption on the metal surface making a barrier to mass and charge transfer. It was found that the adsorption of only tween 20 and 40 follows Langmuir adsorption isotherm. The values of free energy of adsorption for them were calculated. It was found that the adsorption process is spontaneous and increases, for different surfactants, in the same direction as inhibition efficiency. The cyclic voltammetry shows that there is only one anodic peak corresponding to the dissolution reaction of nickel electrode. The current of this dissolution peak was used also for corrosion rate measurements and in evaluation of inhibition efficiencies of the used compounds.

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An ellipsometric study of anodic passivation of nickel in borate buffer solution

Cited by 108 publications

References 26 publications

Corrosion Behaviour of a Highly Alloyed Austenitic Alloy UB6 in Contaminated Phosphoric Acid

Corrosion Behaviour of a Highly Alloyed Austenitic Alloy UB6 in Contaminated Phosphoric Acid

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

Corrosion Inhibition of Nickel in Sulfuric Acid Using Tween Surfactants

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