The Point Defect Model for the Passive State

Macdonald, Digby D.

doi:10.1149/1.2069096

Cited by 1,293 publications

(940 citation statements)

References 15 publications

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“…These vacancies are generated by chloride ions adsorption and diffuse from the film/solution interface across the film, towards the film/metal interface. If diffusion is slowed down, the vacancies condensate cannot reach the critical size at the film/metal interface, preventing pitting [44][45][46]. Along the same line, the slight increment in the R t values in the presence of phosphate ions could be explained as the result of changes in composition which influence the electronic properties of the surface layers and could, in turn, affect the mass transfer of oxygen and/or cation vacancies.…”

Section: Of 43mentioning

confidence: 98%

Phosphate ions as corrosion inhibitors for reinforcement steel in chloride-rich environments

Yohai¹,

Vázquez²,

Valcarce³

2013

Electrochimica Acta

132

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Please cite this article as: L. Yohai, M. Vázquez, M.B. Valcarce, Phosphate ions as corrosion inhibitors for reinforcement steel in chloride-rich environments, Electrochimica Acta (2013), http://dx.doi.org/10. 1016/j.electacta.2013.03.180 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Micro Raman spectra clearly show the incorporation of phosphates to the passive film.Impedance spectroscopy results can be interpreted assuming a duplex surface film formed in the presence of phosphates. In the conditions of this investigation, phosphate ions behave as mixed-type corrosion inhibitors, protecting steel against corrosion in chloride-contaminated environments.

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Section: Of 43mentioning

confidence: 98%

Phosphate ions as corrosion inhibitors for reinforcement steel in chloride-rich environments

Yohai¹,

Vázquez²,

Valcarce³

2013

Electrochimica Acta

132

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“…All the measured Mott-Schottky plots exhibit a linear region with a positive slope, indicating that the passive films formed on these tested specimens exhibit n-type semiconductor properties. For an n-type semiconducting passive film, the parameter N q refers to donor density (N d ) in the space charge region, and the donors are usually some positively charged non-stoichiometric point defects, including oxygen vacancies and cation interstitials [50,67]. For the uncoated Ti-6Al-4V substrate and the Ti 5 Si 3 nanocrystalline coating, as shown in Fig.…”

Section: Influence Of Nb Addition On the Electronic Properties Of Pasmentioning

confidence: 99%

Niobium addition enhancing the corrosion resistance of nanocrystalline Ti5Si3 coating in H2SO4 solution

Liu

et al. 2014

Acta Materialia

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nanocrystalline coatings were deposited onto Ti-6Al-4V substrates by a double glow discharge plasma technique. The effects of Nb alloying on the electrochemical behavior of the Ti 5 Si 3 nanocrystalline coatings were systematically investigated in a naturally aerated 5 wt.% H 2 SO 4 solution, for which various electrochemical techniques, including potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), potentiostatic polarization and Mott-Schottky analysis, were employed. Moreover, to evaluate the corrosion performance of the as-deposited coatings over an extended period, their corrosion resistance was analyzed after 7 days' immersion in a 5 wt.% H 2 SO 4 solution by EIS measurements and observations of corroded surface morphologies. The results showed that the Ti 62.5Àx Nb x Si 37.5 (x = 0, 6.3, 12.5) nanocrystalline coatings exhibit superior corrosion resistance compared with Ti-6Al-4V, and their corrosion resistance is enhanced with increasing Nb content, suggesting that Nb alloying is an effective strategy for improving the corrosion protection ability of the Ti 5 Si 3 nanocrystalline coating. The roles of Nb additions in enhancing the corrosion resistance of the Ti 5 Si 3 nanocrystalline coatings can be summarized as: (a) reducing the residual tensile stresses of the as-deposited coatings and (b) tailoring the composition, compactness and electronic structure of the passive films formed. These findings are expected to broaden the application of Ti 5 Si 3 as a highly corrosion-resistant coating for engineering components operating under aggressive conditions.

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“…To evaluate E, we have used the Point Defect Model (PDM) 13,14,15,16 . The PDM has been developed for electrochemical experiments to interpret anodic oxide growths.…”

Section: Defect Modelmentioning

confidence: 99%

“…The iron oxidation kinetics under irradiation has been then obtained. The electric field influence in the corroded layer has been deduced using the Point Defect Model (PDM) [12][13][14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

Use of the point defect model to interpret the iron oxidation kinetics under proton irradiation

Lapuerta

Moncoffre

Jaffrézic

et al. 2007

Journal of Applied Physics

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This article concerns the study of iron corrosion in wet air under mega-electron-volt proton irradiation for different fluxes at room temperature and with a relative humidity fixed to 45%. Oxidized iron sample surfaces are characterized by ion beam analysis (Rutherford backscattering spectrometry and elastic recoil detection analysis), for the elemental analysis. The structural and physicochemical characterization is performed using the x-ray photoelectron spectroscopy and transmission electron microscopy techniques. We have also measured the iron oxidation kinetics. Radiation enhanced diffusion and transport processes have been evidenced. The modeling of the experimental data shows that the apparent oxygen diffusion coefficient increases whereas the oxygen transport velocity decreases as function of flux. Finally, the point defect model has been used to determine the electric field value in the samples. Results have shown that the transport process can be attributed to the presence of an electrical potential gradient

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The Point Defect Model for the Passive State

Cited by 1,293 publications

References 15 publications

Phosphate ions as corrosion inhibitors for reinforcement steel in chloride-rich environments

Phosphate ions as corrosion inhibitors for reinforcement steel in chloride-rich environments

Niobium addition enhancing the corrosion resistance of nanocrystalline Ti5Si3 coating in H2SO4 solution

Use of the point defect model to interpret the iron oxidation kinetics under proton irradiation

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