Kinetics of oxidation of pure iron near the eutectoid temperature of w�stite

Gemma, Kuniyasu; Kawakami, Mamoru; Kobayashi, Chinatsu; Itoh, N.; Tomida, M.

doi:10.1007/bf01129905

Cited by 8 publications

(4 citation statements)

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“…These whole results, corresponding to those of the literature [2,3,[10][11][12][13][14][15][16][17][18][19] (however in rather different conditions), displays the existence of two reactions. The first one, dominant at the beginning, is oxidation of carbon; it leads to a weight loss by release of carbon monoxide, which may reach towards the mass of carbon contained initially in the sample for the lowest P CO 2 .…”

Section: Discussionsupporting

confidence: 86%

“…the studied system is close to the pure iron oxidation under carbon dioxide atmosphere (Fe/CO 2 ), which had been widely studied [2,[12][13][14][15][16][17][18]. Under pure CO 2 or in CO-CO 2 mixture the reaction occurs at the Fe 1−x O/CO 2 interface: kinetic curves are also linear and the reaction rate is limited by the dissociation of carbon dioxide into carbon monoxide with oxygen ions adsorption according to …”

Section: Mechanism Of Iron Oxidationmentioning

confidence: 99%

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C40E steel oxidation under CO2: Kinetics and reactional mechanism

Valette

Denoirjean

Tétard

et al. 2006

Journal of Alloys and Compounds

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Section: Discussionsupporting

confidence: 86%

Section: Mechanism Of Iron Oxidationmentioning

confidence: 99%

C40E steel oxidation under CO2: Kinetics and reactional mechanism

Valette

Denoirjean

Tétard

et al. 2006

Journal of Alloys and Compounds

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“…Figure 14 shows the temperature dependence of the theoretical parabolic rate constants using the volume diffusion data for Fe interstitials and oxygen vacancies. 52,60 Experimentally derived rate constants, 10,44,67,68 including the ones obtained in this work, range over up to 5 orders of magnitude at a given temperature and are typically larger than those predicted by volume diffusion, especially at low temperatures, in line with earlier studies. 55,64,69 Notably, the slopes defined by the experimental series are generally shallower than predicted.…”

Section: Acs Earth and Space Chemistrysupporting

confidence: 87%

Interface Processes and Anomalous Oxygen Transport in Rapid Metal Oxidation and Magnetite Formation at Protoplanetary Conditions

Harries

2019

ACS Earth Space Chem.

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It has long become evident that the stability and abundance of water across the solar protoplanetary disk was affected by extensive gradients of temperature and oxygen fugacity, but it is unclear to which extent water was directly involved in gas−solid interactions with minerals. In order to better understand the chemical and mineralogical record of water in the early stages of the solar system, I have studied the reaction of metallic Fe 94 Ni 5 Co 1 Cr 1 an analog to common minerals in the protoplanetary diskwith gaseous H 2 /H 2 O mixtures at total pressures of 1 and 10 mbar and temperatures of 350, 450, and 600 °C. The experiments used a specifically designed gas-mixing furnace equipped with a controlled evaporator-mixer for precise H 2 O dosing. The interpretation of the reaction products is aided by nanoscale chemical and microstructural analysis using focused ion beam methods and transmission electron microscopy, providing quantitative measures of the reaction rates and insights into the reaction mechanisms. The kinetics of magnetite formation in these reactions, determined as parabolic rate constants, are orders of magnitude faster than previously reported and suggest a strong contribution of anomalous oxygen transport via "short-circuit diffusion". The total pressure of the H 2 −H 2 O gas relates nonlinearly to the growth rates of magnetite, suggesting that adsorption of H 2 O at the magnetite−gas interface is another controlling mechanism besides diffusion. The growth of magnetite whiskers and the selective retention of slowly diffusing Cr and Ni provide further evidence for growth control by the gas phase and bidirectional transport of iron and oxygen across the magnetite scale, respectively. These phenomena could provide diagnostic tools for identifying magnetite formed under protoplanetary conditions in meteorites and returned samples.

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“…At temperatures below 840 K, only Fe 2 O 3 and Fe 3 O 4 form. Above 840 K, the oxidation rate of pure iron strongly increases, and an additional layer of FeO forms next to the metal (Gemma et al, 1990). The rapid growth of the FeO layer above 840 K is responsible for the increase of absorptivity observed and for the increase in the laser heating rate.…”

Section: Heating and Oxidation In Solid Statementioning

confidence: 98%

Laser Ignition of Bulk Iron, Mild Steel, and Stainless Steel in Oxygen Atmospheres

Muller

El-Rabii

Fabbro

2014

Combustion Science and Technology

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International audienceThe ignition of pure iron, mild steel S355J, and stainless steel 316L has been investigated. The whole ignition and combustion processes have been monitored using a high-speed video camera and adapted pyrometry. Our results show that the absorptivity of the iron and mild steel to laser radiation increases rapidly at 850 K, from 0.45 to 0.7, and that of stainless steel increases more gradually during the heating process from 0.45 to 0.7. The ignition of iron, mild steel, and stainless steel is controlled by a transition temperature, at which the diffusivity of the metal increases sharply. The transition temperature of pure iron and mild steel is around 1750 K, when molten material appears, and that of stainless steel is around 1900 K, when the solid oxide layer loses its protective properties. These temperatures are independent of the oxygen pressure (from 2 to 20 bar) and of the laser intensity (from 1.6 to 34 kW*cm ). During ignition, the temperature increases very strongly at first, and after that a change in the heating rate of the surface is observed. A diffusive-reactive model, provided with equations describing the diffusion of oxygen in the metal and the transfer of heat released by the oxidation reactions has been solved. The model correctly reproduces the sharp rise of temperature as well as the decrease in the heating rate that follows. Comparison between calculated and experimental data shows that, without liquid convection flow in the melt, combustion would extinguish as soon as the metal surface is fully oxidized and that the combustion front moves into the metal

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Kinetics of oxidation of pure iron near the eutectoid temperature of w�stite

Cited by 8 publications

References 4 publications

C40E steel oxidation under CO2: Kinetics and reactional mechanism

C40E steel oxidation under CO2: Kinetics and reactional mechanism

Interface Processes and Anomalous Oxygen Transport in Rapid Metal Oxidation and Magnetite Formation at Protoplanetary Conditions

Laser Ignition of Bulk Iron, Mild Steel, and Stainless Steel in Oxygen Atmospheres

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