Native Air-Formed Oxide Film and its Effect on Magnesium Alloys Corrosion

Galván, S. Feliu Jr. J.C.

doi:10.2174/1876503301003010080

Cited by 34 publications

References 72 publications

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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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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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Insight into CO ₂ reforming of CH ₄ via NiO /dolomite catalysts for production of H ₂ rich syngas

Shamsuddin

Mansir

Anuar

et al. 2021

Intl J of Energy Research

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Dry reforming of methane (DRM) over Ni-based catalyst has become very popular way used for the generation of hydrogen rich syngas. In this study, synergetic effect between NiO and high basicity support of dolomite was investigated to determine their activity and stability in DRM process. In this regard, series of monometallic catalyst samples (NiO/Dolomite) at different metal loadings of 5 to 15 wt% of NiO over dolomite support were prepared via wet impregnation method. The catalyst performance evaluation on the production of H 2 rich syngas was performed and the obtained results showed that 10 wt% NiO/dolomite catalyst sample recorded the maximum conversion of CH 4 and CO 2 to H 2 at 850 C temperature, 9000 hours À1 gÁcat À1 gas hourly space velocity and 0.2 g catalyst loading without in-situ reduction of 5% H 2 gas. 10% NiO/dolomite shows better performance on H 2 selectivity recording up to 75% and H 2 /CO ratio of 1:1. The reaction maintained 98% of CH 4 and CO 2 conversion for up to 10 hours reaction time, with very low coke formation. Non-isothermal reaction of catalyst under CH 4 :N 2 (1:9) proves selfreduced properties of catalyst on dry reforming environment (CH 4 :CO 2 ) started at 300 C. The prepared catalyst samples were successfully characterized using X-ray photoelectron spectroscopy, temperature-programmed oxidation, field emission scanning electron microscopy, and thermogravimetric analysis to study their physiochemical properties, which could give clue on their activity toward DRM. Kinetic and mechanistic studies prove that DRM reaction of NiO/dolomite catalyst follow dual site associative adsorption of both CH 4 and CO 2 with bimolecular surface reaction.

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Influence of hydrogen bubbles adhering to the exposed surface on the corrosion rate of magnesium alloys AZ31 and AZ61 in sodium chloride solution

Feliú

García-Galván

Llorente

et al. 2016

Materials & Corrosion

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The influence of the presence of hydrogen bubbles adhered to the corroding specimen surface on the EIS estimations of corrosion rate of magnesium alloys is considered. The EIS corrosion rates for AZ31 specimens exposing a small area were four times higher than the real values determined by gravimetric or hydrogen evolution measurements. In contrast, no significant differences in the corrosion rate have been observed in the case of the AZ61 specimens. A progressive deterioration in the protective properties of the corrosion products layer formed during the test was observed only on AZ31 specimens exposing a small area.

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Native Air-Formed Oxide Film and its Effect on Magnesium Alloys Corrosion

Cited by 34 publications

References 72 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

Insight into CO ₂ reforming of CH ₄ via NiO /dolomite catalysts for production of H ₂ rich syngas

Influence of hydrogen bubbles adhering to the exposed surface on the corrosion rate of magnesium alloys AZ31 and AZ61 in sodium chloride solution

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Native Air-Formed Oxide Film and its Effect on Magnesium Alloys Corrosion

Cited by 34 publications

References 72 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

Insight into CO 2 reforming of CH 4 via NiO /dolomite catalysts for production of H 2 rich syngas

Influence of hydrogen bubbles adhering to the exposed surface on the corrosion rate of magnesium alloys AZ31 and AZ61 in sodium chloride solution

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Insight into CO ₂ reforming of CH ₄ via NiO /dolomite catalysts for production of H ₂ rich syngas