Appearance potential spectroscopy study of the oxidation of CoNi alloy surfaces

Cherepin, V. T.; Vasil'ev, M. A.; Yakubtsov, O. A.

doi:10.1002/pssa.2210530259

Cited by 13 publications

(3 citation statements)

References 5 publications

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“…The binary alloy's oxidation mechanism is an intricate process. According to the reports (Cherepin et al, 1979;Chi et al, 2005), multiple factors play a role in the oxidation process, such as species of metals, mutual solubility, diffusivity and the affinity between metals and oxygen. shown including three layers: substrate, inner-diffused layer and spinel layer.…”

Section: Pre-oxidation Processmentioning

confidence: 99%

Improving anti-oxidation performance of 430 SS by fabricating co-contained spinel coating as solid oxide fuel cells interconnect

Cheng

Cui

et al. 2018

ACMM

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Purpose The purpose of this study is to improve the performance of AISI 430 stainless steel (430 SS) in increasing its oxidation resistance, suppressing coating spalling and cracking, sustaining appropriate conductivity and blocking Cr evaporation as an interconnect material for intermediate temperature solid oxide fuel cells; a protective co-contained coating is formed onto stainless steel via the surface alloying process and followed by thermal oxidation. Design/methodology/approach In this work, oxidation behavior of coated specimen is studied during isothermal and cyclic oxidation measurements. Moreover, the conductivity is also investigated by area specific resistance (ASR) measurement. Findings Co-contained spinel layer shows an outstanding performance in preventing oxidation and improving conductivity compared with uncoated specimens. The protective spinel coating also reduces the ASR for coated specimen (0.0576O cm2) as compared to the uncoated specimen (1.87296O cm2) after isothermal oxidation. Originality/value The probable mechanism of co-contained alloy converting into spinel and the spinel transfer electron is presented.

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Section: Pre-oxidation Processmentioning

confidence: 99%

Improving anti-oxidation performance of 430 SS by fabricating co-contained spinel coating as solid oxide fuel cells interconnect

Cheng

Cui

et al. 2018

ACMM

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“…Indeed, if the first monolayer is assumed to be 11% enriched in Ni, it may be calculated (by the method described below for a 56 a/o Ni alloy) that the high energy peaks would show only 4% increase in the Ni content of the surface. This simple observation explains why Cherepin et al 22 and Tanaka et aL24 reported only a few percent enhancement of Ni or no significant enhancement, the high energy peaks are not surface sensitive enough to observe the segregation in this system. Furthermore, we have experienced some difficulty in simultaneously matching the 654 eV and the 848 eV peaks in annealed samples.…”

Section: Annealingmentioning

confidence: 69%

Surface segregation and preferential sputtering in CoNi alloys: Computer simulation of Auger spectra

Hajcsar

Dawson

Smeltzer

1987

Surface & Interface Analysis

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The phenomena of surface segregation and preferential sputtering have been investigated in the Co-Ni alloy system where previous results have been contradictory. Six alloys covering the whole solid solution range were annealed at 853 K and quenched to give equilibrium segregated surfaces. Computer simulation methods were employed to analyze spectra in both energy windows significant to the system and results are reported with explanations of previous discrepancies. Shown is the fact that Ni both preferentially sputters and segregates over the whole composition range. The segregation is only truly obvious in low energy (M29M4,5M4,5 transitions) spectra as it is a monolayer phenomenon and higher energy peaks are not surface sensitive enough.

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“…Cherepin et a]. [2] have established that slight (a few per cent above the bulk composition) l) P.O. Box 937, 50-950 Wrodaw, Poland.…”

Section: Introductionmentioning

confidence: 99%

Effect of sulphur on the surface segregation in Co50Ni50 alloy

Godowski

Rudny

1987

Phys. Stat. Sol. (a)

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The surface composition of the polycrystalline Co50Ni50 alloy is determined as a function of temperature by Auger electron spectroscopy (AES) and the influence of the segregation of sulphur on this composition is investigated. The quantitative method of Auger spectrometry based on lowenergy M23 VV transitions is described and the necessity of the use of such transitions in the investigation of segregation is shown. A clean surface of the Co50Ni50 alloy contains 52% Ni in the temperature range 600 to 800 K, while in the range of 800 to 1100 K the surface is enriched in cobalt (66.1% Co at 1100 K). At not too high surface concentrations of sulphur (≦ 15%) the atoms of sulphur compete with those of cobalt for sites in the surface region.

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Appearance potential spectroscopy study of the oxidation of CoNi alloy surfaces

Cited by 13 publications

References 5 publications

Improving anti-oxidation performance of 430 SS by fabricating co-contained spinel coating as solid oxide fuel cells interconnect

Improving anti-oxidation performance of 430 SS by fabricating co-contained spinel coating as solid oxide fuel cells interconnect

Surface segregation and preferential sputtering in CoNi alloys: Computer simulation of Auger spectra

Effect of sulphur on the surface segregation in Co50Ni50 alloy

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