The kinetics of hydrogen evolution and oxygen reduction on Alloy 22

Давыдов, А. Д.; Рыбалка, К. В.; Бекетаева, Л. А.; Engelhardt, George R.; Jayaweera, Palitha; Macdonald, Digby D.

doi:10.1016/j.corsci.2004.05.005

Cited by 50 publications

(24 citation statements)

References 13 publications

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“…For most metal electrodes, the oxygen reduction process obeys the mechanism of reactions in Eqs. (12)- (14) [49][50][51], with the one-electron charge transfer process (Eq. (12)) as the rate-controlling step, irrespective of whether the reaction occurs in acid solution or in alkali solution: 2 2 …”

Section: Tafel Polarizationmentioning

confidence: 99%

A comparative study on corrosion kinetic parameter estimation methods for the early stage corrosion of Q345B steel in 3.5wt% NaCl solution

Cai

Wen

Jin

2017

Int J Miner Metall Mater

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Corrosion kinetic parameters play an important role in researchers' ability to understand and predict corrosion behavior. The corrosion kinetic parameters of structural steel Q345B specimens immersed in 3.5wt% NaCl solution for 1-2 h were determined using linear polarization resistance (LPR), Tafel-curve multiparameter fitting, electrochemical impedance spectroscopy (EIS), and electrochemical frequency modulation (EFM) methods. The advantages and disadvantages of each method were investigated and discussed through comparative investigation. Meanwhile, the average corrosion rate was examined using traditional coupon tests. The results showed that the corrosion current density values estimated by EFM at a base frequency of 0.001 Hz and those obtained by Tafel-curve four-parameter fitting (TC4) are similar and consistent with the results of coupon tests. Because of their slight perturbation of the corrosion system, EIS and EFM/TC4 in collaborative application are the recommended techniques for determining the kinetics and the corresponding parameters for the homogeneous corrosion of the naked metal. In our study of the electrochemical kinetics, we obtained much more abundant and accurate electrochemical kinetic parameters through the combined use of different electrochemical methods.

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Section: Tafel Polarizationmentioning

confidence: 99%

A comparative study on corrosion kinetic parameter estimation methods for the early stage corrosion of Q345B steel in 3.5wt% NaCl solution

Cai

Wen

Jin

2017

Int J Miner Metall Mater

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“…28 On an Alloy C-22 surface claimed to be free of oxide, the kinetics have been explored over wide ranges of pH and temperature. 22 A diffusion limited current was found for large negative potentials at pH ≥ 4. The limiting current density increased over the temperature range from 20…”

mentioning

confidence: 99%

“…21 This makes knowledge of the kinetics for O 2 reduction essential for the development of corrosion models. 22 Despite its importance, the kinetics of this reaction have not been extensively studied on oxide-covered Ni-Cr-Mo alloys.…”

mentioning

confidence: 99%

Effect of Oxide Film Properties on the Kinetics of O₂Reduction on Alloy C-22

Zhang

Qin

Zagidulin

et al. 2017

J. Electrochem. Soc.

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The kinetics of oxygen reduction have been studied electrochemically on the Ni-Cr-Mo(W) Alloy C-22 in 5 M NaCl at 70 • C using potentiostatic and voltammetric techniques and electrochemical impedance spectroscopy. Oxygen reduction was observed to occur at low potentials on defective oxide films containing a high concentration of anion vacancies and appeared to proceed by a combination of 2-electron and 4-electron transfer processes. At more positive potentials a passive film comprising a Cr III -dominated barrier layer at the alloy/oxide interface and a Mo/W enriched outer layer at the oxide/solution interface was formed, and oxygen reduction was completely suppressed. Oxygen reduction could be revived after transpassive degradation of the oxide film at more positive potentials, and appeared to be catalyzed on the Mo VI /W VI surface film.

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“…Thus, at pH 0⋅6, the contribution of hydrogen evolution at E corr is significant. The exchange current density, i 0 , for hydrogen evolution, H + /H 2 and i corr , increase on increasing the concentration of H + ion or decreasing the pH (Davydov et al 2005). Hence corrosion rate increases.…”

Section: Tafel Extrapolation Methodsmentioning

confidence: 95%

Effect of carbon on corrosion resistance of powder-processed Fe-0·35%P alloys

et al. 2010

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The corrosion behaviour of phosphoric irons containing 0⋅35 wt % P, 2% copper, 2% nickel, 1% silicon, 0⋅5% molybdenum, with/without 0⋅15% carbon prepared by powder forging route were studied in different environments. The various environments chosen were acidic (0⋅25 M H 2 SO 4 solution of pH 0⋅6), neutral/marine (3⋅5% NaCl solution of pH 6⋅8) and alkaline (0⋅5 M Na 2 CO 3 + 1⋅0 M NaHCO 3 solution of pH 9⋅4). The corrosion studies were conducted using Tafel extrapolation and linear polarization methods. The studies also compare Armco iron with phosphoric irons. It was observed that the addition of carbon improved the corrosion resistance of a Fe-0⋅35%P-2%Ni-2%Cu-1%Si-0⋅5%Mo alloy in all the environments. Corrosion rates were highest in acid medium, minimal in alkaline medium and low in neutral solution. SEM/EDAX was used to characterize the compositions.

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The kinetics of hydrogen evolution and oxygen reduction on Alloy 22

Cited by 50 publications

References 13 publications

A comparative study on corrosion kinetic parameter estimation methods for the early stage corrosion of Q345B steel in 3.5wt% NaCl solution

A comparative study on corrosion kinetic parameter estimation methods for the early stage corrosion of Q345B steel in 3.5wt% NaCl solution

Effect of Oxide Film Properties on the Kinetics of O₂Reduction on Alloy C-22

Effect of carbon on corrosion resistance of powder-processed Fe-0·35%P alloys

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The kinetics of hydrogen evolution and oxygen reduction on Alloy 22

Cited by 50 publications

References 13 publications

A comparative study on corrosion kinetic parameter estimation methods for the early stage corrosion of Q345B steel in 3.5wt% NaCl solution

A comparative study on corrosion kinetic parameter estimation methods for the early stage corrosion of Q345B steel in 3.5wt% NaCl solution

Effect of Oxide Film Properties on the Kinetics of O2Reduction on Alloy C-22

Effect of carbon on corrosion resistance of powder-processed Fe-0·35%P alloys

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Effect of Oxide Film Properties on the Kinetics of O₂Reduction on Alloy C-22