The role of oxygen transport in oxidation of Fe-Cr alloys

Barnes, D G; Calvert, J.M.; Hay, Kenneth E.; Lees, D. G.

doi:10.1080/14786437308228001

Cited by 44 publications

(13 citation statements)

References 11 publications

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“…Angle resolved diffraction determined that the Fe x+1 Cr 2Àx O 4 concentration increased with distance from the metal oxide interface while (Cr,Fe) 2 O 3 remained fairly constant throughout. The conclusion that oxide growth occurs via cation transport from the metal/ oxide interface is consistent with the O 18 marker work on Fe-Cr high temperature scales by Barnes et al [5] as well as the oxidation mechanism for Fe-Cr steels proposed by Benard [6,7].…”

Section: Introductionsupporting

confidence: 83%

The influence of proton irradiation on the corrosion of HT-9 during immersion in lead bismuth eutectic

Lillard

Paciotti

Tcharnotskaia

2004

Journal of Nuclear Materials

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Section: Introductionsupporting

confidence: 83%

The influence of proton irradiation on the corrosion of HT-9 during immersion in lead bismuth eutectic

Lillard

Paciotti

Tcharnotskaia

2004

Journal of Nuclear Materials

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“…After 1 min of re-oxidation ( Fig.4(a)), the metal/oxide interface, still defined by the maximum intensity of the Ni2signal, is located at 137.5s of sputtering time, which corresponds to 2.1 nm. By looking at both the 16 For a re-oxidation time of 15 min, the Ni2signal indicates that the metal/oxide interface is reached after 360s of sputtering, corresponding to a total oxide layer thickness of 5.4 nm. The oxide film is clearly growing.…”

Section: Characteristic Ionmentioning

confidence: 99%

“…For 1h of re-oxidation, the oxide film thickness is 6.5 nm (corresponding to 435s of sputtering), while for a 2h re-oxidation time, the thickness of the oxide film remains nearly constant (6.8 nm, ~ 450s of sputtering time). By looking at the depth profiles of the 16 Oand 18 Osignals, one observes that the 18 Osignal still has a wide peak in the external surface and the 16 Osignal peak in the inner region for 1h re-oxidation, whereas for 2h re-oxidation, the 16 Oand 18 Odepth profiles overlap in the oxide film region, which is assigned to the the main mechanism dominating the depth profile is the 16 O/ 18 O isotopic exchange. A scheme of the evolution of the oxide layer exposed to 18 O2 at 300°C based on the ToF-SIMS depth profiling data is shown in Fig.5.…”

Section: Investigation Of Ion Transport Process In Oxide Layersmentioning

confidence: 99%

“…The surface oxide film is known to play a key role in the corrosion resistance of metals and alloys. Thus, the understanding of their nature, structure, composition and growth kinetics is important and requires a detailed knowledge of the iontransport mechanisms [15][16][17]. Until now, there is still a lack of data on the ion transport process in the oxide film formed on stainless steel surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…In Graham's work, the oxidation of clean polycrystalline and monocrystalline (100) Cr metallic surfaces at temperatures above 800°C was studied. The first oxidation in dry and low 18 O2 gas followed by re-oxidation in low pressure 16 O2 gas, allowed the authors to conclude that under the temperature and pressure conditions used, the oxide film grows by outward cation diffusion. In Poulain's work, the Cr metal oxidation was performed in situ at 300°C in the ToF-SIMS main chamber (the native oxide being reduced by successive sputtering annealing prior to the oxidation).…”

Section: Introductionmentioning

confidence: 99%

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Ion transport mechanisms in the passive film formed on 304L stainless steel studied by ToF-SIMS with 18O isotopic tracer

et al. 2020

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The ion transport in the pre-formed passive film on 304L stainless steel surface has been investigated by in situ ToF-SIMS with isotopic tracer. The passive film, formed electrochemically in sulfuric acid, has a bilayer structure with outer iron oxide and inner chromium oxide layers. Further exposure of the passive film to 18 O2 gas (isotopic tracer) at 300°C reveals that outward cation diffusion is the governing ion transport mechanism for the oxide growth. The parabolic rate constant for the oxide growth was determined. The cation diffusion coefficient is found to be markedly higher than the oxygen diffusion coefficient.

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The growth and structure of oxide films formed on single crystal (100) and polycrystalline Cr between 550 and 900 °C

Hussey

Mitchell

Graham

1987

Materials & Corrosion

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The oxidation of polycrystalline and (100)Cr at temperatures from 550-900°C and 5 x to 5 x lo-' torr oxygen pressure, choosing surface pretreatments such that only adherent. uniform, pore-free polycrystalline a-Cr,O, is produced, show long term parabolic growth kinetics with an activation energy -51 kcal mol-I. Oxide layers, produced by sequential oxidation in '*02 and I6O2. were suitable for the application of polyatomic SIMS to elucidate the extent of oxygen transport in the growing oxides and the mechanism for their growth. The data show that the predominant growth mechanism is by outward cation transport, with a small yet significant amount of inward oxygen diffusion down oxide grain boundaries. -1% of the oxide is created within the film as a result of this inward diffusion. Oxygen diffusion coefficients were found to be orders of magnitude higher than oxygen self diffusion coefficients in Cr,O, but much too low to account for the observed oxidation rates.Die Oxidation von polykristallinem und (100)-Cr bei Temperaturen zwischen 550 und 900°C und Sauerstoffbriicken zwischen 5lo-' und 5 . lo-' torr (bei Verwendung von Oberflachenvorbehandlungen, welche die ausschlieRliche Bildung von festhaftendem einheitlichem, porenfreiem polykristallinem a-Cr20, gewahrleisten) folgt langzeitig einem parabolischen Zeitgesetz mit emer Aktivierungsenergie von etwa 51 kcal mot-'. Die durch aufeinanderfolgende Oxidation in IsO2 und I6O2 erzeugten Oxidschichten konnten mittels polyatomarer SIMS analysiert werden, so daR das AusmaR des Sauerstofftransports in den wachsenden Oxidschichten und der Wachstumsmechanismus geklart werden konnten. Die Ergebnisse zeigten, daO der dominierende Wachstumsmechanismus der Kationentransport nach auRen ist und nur ein kleiner, jedoch nicht zu vernachlassigender Transport an Sauerstoff entlang der Oxidkorngrenzen nach innen erfolgt. Etwa l% des Oxids entsteht innerhalb der Zunderschicht durch diese Diffusion nach innen. Die Diffusionskoeffizienten von Sauerstoff waren um mehrere GroRenordnungen hoher als die Selbstdiffusionskoeffizienten des Sauerstoffs in Crz03, doch waren sie immer noch weitaus zu niedrig, urn die beobachteten Oxidationsgeschwindigkeiten erklaren zu konnen.

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The role of oxygen transport in oxidation of Fe-Cr alloys

Cited by 44 publications

References 11 publications

The influence of proton irradiation on the corrosion of HT-9 during immersion in lead bismuth eutectic

The influence of proton irradiation on the corrosion of HT-9 during immersion in lead bismuth eutectic

Ion transport mechanisms in the passive film formed on 304L stainless steel studied by ToF-SIMS with 18O isotopic tracer

The growth and structure of oxide films formed on single crystal (100) and polycrystalline Cr between 550 and 900 °C

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