Quantitative AES depth profiling of iron and chromium oxides in solid solution, (Cr1−xFex)2O3

Asteman, Henrik; Norling, Rikard; Svensson, Jan‐Erik; Nylund, Anders; Nyborg, Lars

doi:10.1002/sia.1290

Cited by 17 publications

(8 citation statements)

References 9 publications

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“…Since the sensitivity factors for oxygen in Cr 2 O 3 and Fe 2 O 3 are different from that for Al 2 O 3 the oxygen signal will be slightly off when mixtures of the oxides are present [19].…”

Section: Auger Electron Spectroscopy Aesmentioning

confidence: 99%

KCl-Induced Corrosion of the FeCrAl Alloy Kanthal ® AF at 600 °C and the Effect of H2O

et al. 2014

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The present study investigates the influence of H 2 O and KCl on the high-temperature corrosion of the FeCrAl alloy Kanthal Ò AF. Polished samples, with and without applied KCl, were exposed isothermally to O 2 or O 2 ? H 2 O at 600°C. The samples were investigated using TGA, XRD, SEM/EDX, AES and IC. It was found that KCl accelerates corrosion and that a rapidly growing iron, chromium-rich oxide forms in both environments. Chromate formation and alloy chlorination are shown to initiate the formation of non-protective oxide scales. In addition, aluminium nitrides form in the alloy substrate in both environments.

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“…Since the sensitivity factors for oxygen in Cr 2 O 3 and Fe 2 O 3 are different from that for Al 2 O 3 the oxygen signal will be slightly off when mixtures of the oxides are present [19].…”

Section: Auger Electron Spectroscopy Aesmentioning

confidence: 99%

KCl-Induced Corrosion of the FeCrAl Alloy Kanthal ® AF at 600 °C and the Effect of H2O

et al. 2014

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“…Since the sensitivity factor for oxygen in Cr 2 O 3 and Fe 2 O 3 are different from that for Al 2 O 3 , the oxygen signal will be slightly off when mixtures of the oxides are present [19]. The computer software PHI-Matlab and linear least square (LLS) routines were used to separate the oxide and metal components in the depth profiles.…”

Section: Ion Chromatography Icmentioning

confidence: 99%

KCl-Induced Corrosion of an FeCrAl Alloy at 600 °C in O2 + H2O Environment: The Effect of Pre-oxidation

et al. 2014

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The present study investigates the influence of H 2 O and KCl on the high temperature corrosion of an FeCrAl alloy at 600°C. Polished samples were exposed to O 2 or O 2 ? H 2 O and to O 2 ? H 2 O with KCl applied. The samples were investigated using SEM/EDX, XRD, IC, AES and SIMS. It was found that KCl accelerates corrosion and that a rapidly growing iron-rich oxide forms with time. Chromate formation is shown to initiate the formation of a non-protective oxide scale. Pre-oxidising the alloy before exposure in the presence of KCl had a strongly beneficial effect on the corrosion.

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“…10 molar fraction. 30 The main advantage of using AES is the possibility of conducting depth profiling for oxide thickness determination in selected areas even on powder samples. Figure 4 shows a typical depth profile recorded in this manner from a single particle of the high Cr material.…”

Section: Aesmentioning

confidence: 99%

Surface chemical analysis of prealloyed water atomised steel powder

Karlsson¹,

Nyborg²,

Berg³

2005

Powder Metallurgy

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Prealloyed water atomised steel powder was investigated regarding composition, morphology and thickness of the surface oxide. The materials were two varieties of Cr alloyed and one Mo alloyed. The oxides formed on powder surfaces were studied by means of the surface analytical techniques X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy, in combination with high resolution electron microscopy and X-ray microanalysis.On all powder surfaces, the oxide formed contained strong oxide forming elements such as Cr, Mn and Si. Still, the dominant oxide on the powder surface was Fe oxide, the relative cation concentration in the surface being about 80%. The surface morphology showed a heterogeneous structure with particulate compounds supposed to be rich in strong oxide formers and an Fe rich thin oxide layer. This heterogeneous surface oxide morphology was more pronounced for the Mo alloyed powder compared with the Cr alloyed varieties. For this alloy, the average thickness of the oxide layer was somewhat larger (7-8 . 5 nm for fraction ,63 mm and 63-106 mm) compared with that of Cr alloyed powder (6-7 nm in all cases for fraction ,63 mm and 63-106 mm). An interesting observation was that Cr oxide also appeared on the nominally Cr free Mo alloyed powder, which indicates selective oxidation of Cr also when this element is present in low quantities. Although the alloying elements are enriched by a factor of 40-50 in the surface oxide, there is little effect on depletion of them from the steel matrix.From a sintering point of view, the particulate oxide compounds should play a minor role, since the most probable contacts between individual metal particles are Fe oxide/Fe oxide.

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Quantitative AES depth profiling of iron and chromium oxides in solid solution, (Cr_1−xFe_x)₂O₃

Cited by 17 publications

References 9 publications

KCl-Induced Corrosion of the FeCrAl Alloy Kanthal ® AF at 600 °C and the Effect of H2O

KCl-Induced Corrosion of the FeCrAl Alloy Kanthal ® AF at 600 °C and the Effect of H2O

KCl-Induced Corrosion of an FeCrAl Alloy at 600 °C in O2 + H2O Environment: The Effect of Pre-oxidation

Surface chemical analysis of prealloyed water atomised steel powder

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