Sulphur diffusion through a growing chromia scale and effects of water vapour

Sha, Chuhan; Yang, Limei; Cairney, Julie M.; Zhang, Jianqiang; Young, David J.

doi:10.1016/j.corsci.2023.111410

Cited by 5 publications

(1 citation statement)

References 33 publications

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“…[24] APT is increasingly being used to analyze oxides and corrosion processes. [25][26][27][28] For example, the transport mechanisms of impurities such as C and Cl [29,30] or the accumulation of S species in oxides, [31] as well as the oxygen and hydrogen diffusion pathways in the early stages of corrosion, have been proved using trace elements such as 18 O or 2 H. [32,33] The segregation alloy elements toward the gas / liquid / metal interface and the formation of a quasi-passivating layer of Al 2 0 3 have also been observed. [34] However, the experiments were performed either in an additional reaction chamber for the gas-solid reaction or the samples were corroded in an aqueous medium liquid and the specimens must be prepared ex situ for APT and therefore the corrosion products etc.…”

Section: Introductionmentioning

confidence: 99%

Quasi‐“In Situ” Analysis of the Reactive Liquid‐Solid Interface during Magnesium Corrosion Using Cryo‐Atom Probe Tomography

Schwarz,

Yang,

Aota

et al. 2024

Advanced Materials

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The early stages of corrosion occurring at liquid‐solid interfaces controls the evolution of the material's degradation process, yet due to their transient state, their analysis remains a formidable challenge. Here we perform corrosion tests on a MgCa alloy, a candidate material for biodegradable implants using pure water as a model system. The corrosion reaction was suspended by plunge freezing into liquid nitrogen. We studied the evolution of the early‐stage corrosion process on the nanoscale by correlating cryo‐atom probe tomography with transmission‐electron microscopy and spectroscopy. We observed the outward growth of Mg hydroxide and the inward growth of an intermediate corrosion layer consisting of hydroxides of different compositions, mostly monohydroxide Mg(OH) instead of the expected MgO layer. In addition, Ca partitions to these newly formed hydroxides and oxides. Density‐functional theory calculations suggest a domain of stability for this previously experimental unreported Mg(OH) phase. These new approach and findings advance the understanding of the early stages of magnesium corrosion, and in general reactions and processes at liquid‐solid interfaces, which can further facilitate the development of corrosion‐resistant materials or better control of the biodegradation rate of future implants.This article is protected by copyright. All rights reserved

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Section: Introductionmentioning

confidence: 99%

Quasi‐“In Situ” Analysis of the Reactive Liquid‐Solid Interface during Magnesium Corrosion Using Cryo‐Atom Probe Tomography

Schwarz,

Yang,

Aota

et al. 2024

Advanced Materials

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High-Temperature Corrosion of Chromia-Forming Ni-Based Alloys in CO2 Containing Impurities

Oleksak,

Tylczak,

Teeter

et al. 2023

High Temperature Corrosion of mater.

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Future technologies require structural materials resistant to environmental degradation in high temperature CO 2 -rich environments. Herein we exposed several commercially available 263, 282, 617, 625, 740H) to atmospheric pressures gases intended to simulate the compositions expected in future direct-red supercritical CO 2 power cycles. The alloys were exposed to 95% CO 2 + 4% H 2 O + 1% O 2 and the same gas containing 0.1% SO 2 at temperatures of 600, 650, 700, 750, and 800°C for 2500 h. With minor exceptions, chromia scales formed on all alloys at all temperatures in the SO 2 -free gas, yielding parabolic growth rates that followed a clear Arrhenius temperature-dependence. Behavior in the SO 2 -containing gas was more complex. Generally, the alloys performed well at temperatures of 650, 750, and 800°C. While some alloys further performed relatively well across the whole temperature range, several of the alloys experienced chromia failure and higher oxidation rates at temperatures of 600 and 700°C. Deviation from protective behavior was associated with internal sul de formation and, additionally for the case of 600°C, external sulfate formation. The thermodynamic and kinetic factors in uencing the accelerated corrosion in the presence of sulfur are discussed. The results suggest that caution is required when assessing compatibility of Ni-based alloys for CO 2 -based systems when sulfurbased impurities are expected.

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Effects of Si and SO2 on Corrosion of Fe–20Cr and Fe–20Cr–20Ni Alloys in Reducing Waste Combustion Gases

Nguyen,

Zhang,

Young

2023

High Temperature Corrosion of mater.

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Model alloys, Fe–20Cr and Fe–20Cr–20Ni (wt%) with and without 1% Si, were exposed to four different gas mixtures Ar–10H2O, Ar–10H2O–0.1HCl, Ar–10H2O–0.1HCl–10CO2, Ar–10H2O–0.1HCl–10CO2–0.5SO2 (vol.%) at 650 °C. The Fe–20Cr and Fe–20Cr–20Ni alloys underwent breakaway corrosion in Ar–10H2O–(0.1HCl)–(10CO2), forming Cr2O3 and Fe-rich oxide nodules. Silicon addition markedly increased corrosion resistance for both alloys by forming an additional SiO2 layer beneath the Cr2O3 scale. Addition of SO2 to Ar–10H2O–0.1HCl–10CO2 significantly suppressed the formation of Fe-rich oxide nodules on Fe–20Cr. Corrosion in the SO2-bearing gas resulted in (Cr, Fe, S)-rich precipitates in all alloys. The effects of gas composition and Si alloying on corrosion of both alloys are discussed in terms of transport processes within the scales.

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Sulphur diffusion through a growing chromia scale and effects of water vapour

Cited by 5 publications

References 33 publications

Quasi‐“In Situ” Analysis of the Reactive Liquid‐Solid Interface during Magnesium Corrosion Using Cryo‐Atom Probe Tomography

Quasi‐“In Situ” Analysis of the Reactive Liquid‐Solid Interface during Magnesium Corrosion Using Cryo‐Atom Probe Tomography

High-Temperature Corrosion of Chromia-Forming Ni-Based Alloys in CO2 Containing Impurities

Effects of Si and SO2 on Corrosion of Fe–20Cr and Fe–20Cr–20Ni Alloys in Reducing Waste Combustion Gases

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