Determination of Oxygen Diffusion Coefficient in Oxidation Films of the AISI 439 Ferritic Stainless Steel

2012 ◽  
Vol 323-325 ◽  
pp. 339-344 ◽  
Author(s):  
Antônio Claret Soares Sabioni ◽  
Emiliane Advíncula Malheiros ◽  
Vincent Ji ◽  
François Jomard
Keyword(s):  
Stainless Steel ◽  
Diffusion Coefficient ◽  
Oxide Film ◽  
Ferritic Stainless Steel ◽  
Oxygen Diffusion ◽  
Oxide Films ◽  
Ion Diffusion ◽  
Exchange Method ◽  
Oxygen Ion ◽  
Oxygen Ion Diffusion

In order to investigate the role of oxygen diffusion in the oxidation process of the AISI 439 ferritic stainless steel, oxygen ion diffusion coefficients were determined, for the first time, in oxide films formed by the oxidation of this steel. Steel samples were firstly oxidized from 750oC to 900oC, in synthetic air, in order to grow oxide films mainly made up of chrome oxide; the oxygen diffusion experiments were then performed using the stable isotope18O as oxygen tracer. The introduction of the18O in the oxide film was performed by means of the gas-solid isotopic exchange method, in the temperature range of 750-900oC, in Ar+21%18O2atmosphere. The18O diffusion profiles were established by secondary ion mass spectrometry (SIMS). Parabolic oxidation constants calculated by means of Wagner´s theory, using the oxygen ion diffusion coefficient determined by our experimental process, are greater than oxidation constants previously determined in oxidation experiments from 850 to 950º C, in air, which indicates that the oxygen ion diffusion is large enough to assure the growth rate of the oxide film formed by the oxidation of the AISI 439 steel in these temperatures.

Oxygen Diffusion Study in Oxidation Films of the AISI 304 Austenitic Stainless Steel

2012 ◽  
Vol 323-325 ◽  
pp. 345-351 ◽  
Author(s):  
Antônio Claret Soares Sabioni ◽  
Roberto Paulo Barbosa Ramos ◽  
Vincent Ji ◽  
François Jomard
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Oxygen Diffusion ◽  
Oxide Films ◽  
Ion Diffusion ◽  
Aisi 304 ◽  
Oxygen Ion ◽  
304 Austenitic Stainless Steel ◽  
Oxygen Ion Diffusion ◽  
Diffusion Profiles

Oxygen ion diffusion coefficient was measured, for the first time, in oxide films grown by the high temperature oxidation of the AISI 304 austenitic stainless steel. The steel samples were polished and then oxidized in synthetic air in order to grow the chromia oxide (Cr2O3) film. The oxygen diffusion experiments in the oxide films were performed by using the18O isotope as oxygen tracer. The isotope diffusion studies were performed from 750 to 900o C, in Ar +21%18O2 atmosphere and the oxygen ion diffusion profiles were established by secondary ion mass spectrometry (SIMS) analysis. From the18O diffusion profiles, the bulk, effective and grain boundary diffusivities were determined. Using Wagner´s theory, it is shown that, under the used experimental conditions, the oxygen ion diffusion is large enough to assure the growth rate of the chrome oxide films formed by the oxidation of the AISI 304 stainless steel.

About the Role of Chromium and Oxygen Ion Diffusion on the Growth Mechanism of Oxidation Films of the AISI 304 Austenitic Stainless Steel

2012 ◽  
Vol 78 (3-4) ◽  
pp. 211-220 ◽  
Author(s):  
Antônio Claret Soares Sabioni ◽  
Roberto Paulo Barbosa Ramos ◽  
Vincent Ji ◽  
François Jomard ◽  
Waldemar Augusto de Almeida Macedo ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Growth Mechanism ◽  
Ion Diffusion ◽  
Aisi 304 ◽  
Oxygen Ion ◽  
304 Austenitic Stainless Steel ◽  
Mechanism Of Oxidation ◽  
Oxygen Ion Diffusion

A molecular dynamics study of oxygen ion diffusion in A-site ordered perovskite PrBaCo2O5.5: data mining the oxygen trajectories

2015 ◽  
Vol 17 (12) ◽  
pp. 7831-7837 ◽  
Author(s):  
Chi Chen ◽  
Dengjie Chen ◽  
Francesco Ciucci
Keyword(s):  
Data Mining ◽  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Oxygen Diffusion ◽  
Ion Diffusion ◽  
Oxygen Ion ◽  
Dynamics Simulations ◽  
A Site ◽  
Oxygen Ion Diffusion

Data mining the trajectories of molecular dynamics simulations leads to a better understanding of oxygen diffusion in perovskites.

scholarly journals Oxygen deficient layered double perovskite as an active cathode for CO2 electrolysis using a solid oxide conductor

2015 ◽  
Vol 182 ◽  
pp. 227-239 ◽  
Author(s):  
Tae Ho Shin ◽  
Jae-Ha Myung ◽  
Maarten Verbraeken ◽  
Guntae Kim ◽  
John T. S. Irvine
Keyword(s):  
Double Perovskite ◽  
Cathode Side ◽  
Layered Perovskite ◽  
Ion Diffusion ◽  
Oxide Electrode ◽  
Oxygen Ion ◽  
A Site ◽  
Oxygen Ion Diffusion ◽  
Co2 Electrolysis ◽  
A Current

A-site ordered PrBaMn2O5+δ was investigated as a potential cathode for CO2 electrolysis using a La0.9Sr0.1Ga0.8Mg0.2O3 (LSGM) electrolyte. The A-site ordered layered double perovskite, PrBaMn2O5+δ, was found to enhance electrocatalytic activity for CO2 reduction on the cathode side since it supports mixed valent transition metal cations such as Mn, which could provide high electrical conductivity and maintain a large oxygen vacancy content, contributing to fast oxygen ion diffusion. It was found that during the oxidation of the reduced PrBaMn2O5+δ (O5 phase) to PrBaMn2O6−δ (O6 phase), a reversible oxygen switchover in the lattice takes place. In addition, here the successful CO2 electrolysis was measured in LSGM electrolyte with this novel oxide electrode. It was found that this PrBaMn2O5+δ, layered perovskite cathode exhibits a performance with a current density of 0.85 A cm−2 at 1.5 V and 850 °C and the electrochemical properties were also evaluated by impedance spectroscopy.

Werkstoffaufbau und diffusiver Stofftransport aufgezeigt an ausgewählten Beispielen / Material structure and diffusive mass transport as pointed out by means of selected examples

2000 ◽  
Vol 6 (4) ◽  
pp. 429-450
Author(s):  
R. Kriegel ◽  
A. Buchwald ◽  
Ch. Kaps
Keyword(s):  
Mass Transport ◽  
Diffusion Coefficients ◽  
Transport Mechanism ◽  
Diffusion Models ◽  
Second Law ◽  
Material Structure ◽  
Ion Diffusion ◽  
Oxygen Ion ◽  
Oxygen Ion Diffusion

Abstract The diffusive mass transport in materials is above all determined by the material structure. The experimental determination of diffusion coefficients is based on diffusion models, which results from special mathematical solutions of Fick's second law and its corresponding boundary conditions. The general usefulness of these diffusion models will be described using some examples, e. g. the diffusion of deteriorating salts in masonry materials, the oxygen ion diffusion in mixed conducting ceramics and the cation exchange in single crystals. The measurement of the diffusion coefficients results in a better comprehension of the transport mechanism as well as of the "morphology" of the transport medium, which allows to optimize the conditions of the mass transport and the material structure and composition, respectively.

Identification of the Initial Oxide Films on 18-8 Stainless Steel in High Temperature Water

CORROSION ◽  
1968 ◽  
Vol 24 (10) ◽  
pp. 336-337 ◽  
Author(s):  
T. NAKAYAMA ◽  
Y. OSHIDA
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Oxide Film ◽  
Oxide Films ◽  
Spinel Type ◽  
High Temperature Water ◽  
Temperature Water

Abstract Initial oxide film formed on 18–8 stainless steel in high temperature water at 300 C (572 F) for 1 hour was identical with corundum type crystals like (Cr, Fe)2O3 alone or its coexistence with α-Fe2O3. On the contrary, the oxide film produced by prolonged oxidation (24 hours) consisted mainly of the spinel type crystals containing nickel.

scholarly journals Fast grain boundary oxygen ion diffusion in the α-phase of Bi2O3

2017 ◽  
Vol 299 ◽  
pp. 89-92 ◽  
Author(s):  
Richard J. Chater ◽  
Andrea Cavallaro ◽  
Ryan D. Bayliss ◽  
Stuart N. Cook ◽  
Bryan D. Esser ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Ion Diffusion ◽  
Oxygen Ion ◽  
Α Phase ◽  
Oxygen Ion Diffusion
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