Photocurrent and capacitance investigations into the nature of the passive films on austenitic stainless steels

Wijesinghe, T.L. Sudesh L.; Blackwood, Daniel John

doi:10.1016/j.corsci.2007.06.009

Cited by 75 publications

(29 citation statements)

References 21 publications

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“…It is important to remark that capacitance is frequency dependant . Several causes for the frequency dispersion have been proposed: (i) a non‐uniform distribution of point defects through the passive film [46,50,53]; (ii) the contribution of surface states to the capacitance response (adsorption of anions, e.g.…”

Section: Resultsmentioning

confidence: 99%

“…Several causes for the frequency dispersion have been proposed: (i) a non‐uniform distribution of point defects through the passive film [46,50,53]; (ii) the contribution of surface states to the capacitance response (adsorption of anions, e.g. chlorides, or other species) ; (iii) the ionic part of the space charge layer, which gives a contribution only at low frequencies due to the low ionic mobility, particularly in heavily doped materials where the space charge region is very thin (passive films generally satisfy these requirements) ; (iv) dielectric relaxation phenomena which occur throughout the space charge layer and the Helmholtz layer ; (v) an amorphous and strongly disordered semiconductor nature of passive films, characterised by a high density of localised states between the valence and the conduction band and whose charging leads to a strong frequency dependent capacitance behaviour ; (vi) presence of deep donor states .…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, in Region II ( E > E FB ), the slope of the linear zone is positive, indicating the properties of an n ‐type semiconductor. It is widely accepted that the semiconducting behaviour of Fe‐Cr and Fe‐Cr‐Ni alloys reflects a duplex structure of passive films . This structure has been found to be rather complex, especially in highly alloyed stainless steels .…”

Section: Resultsmentioning

confidence: 99%

“…It is widely accepted that the semiconducting behaviour of Fe‐Cr and Fe‐Cr‐Ni alloys reflects a duplex structure of passive films . This structure has been found to be rather complex, especially in highly alloyed stainless steels . The formation of a ternary inner Fe‐Cr‐Ni oxide layer with spinel structure has been proposed in the literature for passive films formed on highly alloyed stainless steels and nickel‐base alloys .…”

Section: Resultsmentioning

confidence: 99%

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Effect of temperature on the passive state of Alloy 31 in a LiBr solution: Passivation and Mott‐Schottky analysis

Fernández‐Domene

Blasco‐Tamarit

García-García

et al. 2015

Materials & Corrosion

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The passive behaviour of Alloy 31, a highly‐alloyed austenitic stainless steel (UNS N08031), has been investigated in a LiBr heavy brine (700 g/l) at different temperatures using potentiostatic polarisation and Mott‐Schottky analysis. Cation vacancies have been found to be the dominant defect in the passive films formed on Alloy 31. An increase in temperature enhanced the generation of cation vacancies at the film/solution interface and raised the steady‐state passive current density. The density of defects within the passive film also increased significantly with temperature, making the film more conductive and less protective against localised attacks.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Effect of temperature on the passive state of Alloy 31 in a LiBr solution: Passivation and Mott‐Schottky analysis

Fernández‐Domene

Blasco‐Tamarit

García-García

et al. 2015

Materials & Corrosion

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“…where ε is the dielectric constant of the passive film (a value of 15.6 has been assumed for the chromium and iron oxides formed on stainless steels [49,50] and Raman spectroscopy analysis) and an inner layer containing chromium oxides.…”

Section: Capacitance Measurementsmentioning

confidence: 99%

Characterization of thermal oxide films formed on a duplex stainless steel by means of confocal-Raman microscopy and electrochemical techniques

2015

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ElsevierSánchez Tovar, R.; Leiva García, R.; García Antón, J. (2015). Characterization of thermal oxide films formed on a duplex stainless steel by means of confocal-Raman microscopy and electrochemical techniques. Thin Solid Films. 576:1-10. doi:10.1016/j.tsf.2014.12.024. Regarding the electrochemical properties of these films, the corrosion resistance of the film tends to be lower with the heat treatment temperature, probably due to a more porous and heterogeneous scale. Mott Schottky plots show the n-type semiconductive behaviour of the films with donor densities that decrease with the enhancement of the temperature.

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Study of the correlation between corrosion resistance and semi‐conducting properties of the passive film of AISI 316L stainless steel in physiological solution

Antunes

Oliveira

Costa

2011

Materials & Corrosion

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In this work the corrosion resistance of AISI 316L biomedical stainless steel was assessed through electrochemical impedance spectroscopy (EIS) measurements in Hanks' solution at 37 °C. Specimens were immersed in the electrolyte during 21 days. Semi‐conducting properties of the passive film naturally formed on the surface of the metallic material during the test were evaluated through the Mott–Schottky approach. The aim was to investigate the correlation between corrosion resistance and semi‐conducting properties in the physiological solution. The corrosion resistance was found to decrease with the immersion time. The density of defects in the passive film increased accordingly as indicated by the Mott–Schottky plots. The passive film presented a semi‐conducting behavior with a duplex character. Above the flat band potential the behavior was typical of an n‐type semiconductor whilst below such value it was typical of a p‐type semiconductor. The results from EIS measurements and Mott–Schottky were in good agreement, suggesting that the corrosion resistance of biomedical stainless steels may be associated with the semi‐conducting properties of the passive films formed during immersion in physiological medium.

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Photocurrent and capacitance investigations into the nature of the passive films on austenitic stainless steels

Cited by 75 publications

References 21 publications

Effect of temperature on the passive state of Alloy 31 in a LiBr solution: Passivation and Mott‐Schottky analysis

Effect of temperature on the passive state of Alloy 31 in a LiBr solution: Passivation and Mott‐Schottky analysis

Characterization of thermal oxide films formed on a duplex stainless steel by means of confocal-Raman microscopy and electrochemical techniques

Study of the correlation between corrosion resistance and semi‐conducting properties of the passive film of AISI 316L stainless steel in physiological solution

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