Accelerated Corrosion of Stainless Steels in the Presence of Molten Carbonate below 923 K

Ota, Ken‐ichiro; Toda, Katsuya; Motohira, N.; Kamiya, Noriho

doi:10.1557/proc-496-231

Cited by 13 publications

(11 citation statements)

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“…7 The oxygen reduction reaction on a microplatinum electrode has been investigated for various polymer electrolyte membranes. [14][15][16][17][18][19][20][21][22][23][24] Some of the methods of the determination for oxygen reduction reaction are as follows. One was a membrane recast on a platinum electrode in aqueous acidic solutions.…”

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confidence: 99%

“…16 The third was a solidstate cell method that used microelectrodes set in a glass rod, and the glass rod was set on the electrolyte membrane. [17][18][19][20][21][22][23][24] This method minimizes the effect of electrode structure and can be used for the determination of properties of PEFC materials. To understand the oxygen reduction reaction in a gas diffusion electrode, the mass transport and charge-transfer behavior must be determined.…”

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confidence: 99%

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Analysis of Oxygen Reduction on Pt Microelectrode with Polymer Electrolytes of Various Exchange Capacities

Mitsushima

Araki

Kamiya

et al. 2002

J. Electrochem. Soc.

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In order to obtain an improved design of a polymer electrolyte fuel cell cathode, the oxygen reduction reaction on a Pt microelectrode with proton exchange membranes of various exchange capacities has been investigated. The measurements were performed by chronoamperometry for determination of the diffusion coefficient and oxygen solubility, and by slow scan voltammetry for reaction kinetics with the microelectrode in the temperature range 20 to 70°C. The results of chronoamperometry and slow scan voltammetry were analyzed by the fitting of analytic equations and digital simulation. The diffusion coefficients increased with temperature and exchange capacity. On the other hand, the solubilities increased with a decrease in temperature and exchange capacity. The dependences of the diffusion coefficient on temperature and exchange capacity were larger than those of the solubility. Accordingly, the permeabilities, which are the product of the diffusion coefficient and the solubility, increased with temperature and exchange capacity. Although the dependence of the exchange current densities on the exchange capacity was not clear, the exchange current densities were 10−9 to 10−8Acm−2 in the high potential region and about 10−6Acm−2 in the low potential region. © 2002 The Electrochemical Society. All rights reserved.

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Analysis of Oxygen Reduction on Pt Microelectrode with Polymer Electrolytes of Various Exchange Capacities

Mitsushima

Araki

Kamiya

et al. 2002

J. Electrochem. Soc.

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“…alloys of Fe, Ni, and Cr). Corrosion was found to be more severe at 550°C vs. 650°C, which indicates a change in passivation layer due to thermodynamics [33]. Below 580°C the formation of a porous LiFe 5 O 8 was present, while at higher temperature LiFeO 2 was formed and acts as a protective barrier [34].…”

Section: Ullage Gas Effects (Atmosphere Anode Gases Cathode Gases)mentioning

confidence: 97%

Corrosion mechanisms in chloride and carbonate salts.

Kruizenga¹

2012

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State of the art thermal solar power uses nitrate salts as the heat transfer fluid. In order to increase operating efficiencies high turbine inlet temperatures must be achieved. Different heat transfer fluids must be considered for this purpose. Corrosion mechanisms in chloride and carbonate based salts were reviewed to better understand the practical implications for using either salt in a solar system.

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“…CO 2 en el cátodo a la temperatura de 650 °C y presiones entre 1 y 7 atm. En estas condiciones de operación, una gran cantidad de metales experimentan una corrosión considerable (1)(2)(3). Los aceros inoxidables se utilizan en las celdas de combustibles como constituyentes tales como separadores y recolectores de corriente.…”

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Estudio de la corrosión de diferentes aleaciones en sales de carbonatos fundidos con la técnica de espectroscopía de impedancia electroquímica

Pérez¹,

Hierro²,

Gómez³

et al. 2000

Bol. Soc. Esp. Ceram. Vidr.

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En el presente trabajo se compara el comportamiento frente a la corrosión de diferentes aleaciones (aceros inoxidables AISI 304 y AISI 310S y aleación TiAl6V) en un electrolito de carbonatos fundidos a 650°C. Con la técnica de impedancia se determina "in situ" la velocidad de corrosión de las aleaciones, la resistencia del electrolito, es decir, la concentración del óxido disuelto y otras características de las capas de productos de corrosión. Teniendo en cuenta la caracterización de los productos de corrosión mediante difracción de rayos X (XRD) y microscopía electrónica de barrido (SEM) y los resultados de espectroscopía de impedancia (EIS), se propone un mecanismo para cada una de las aleaciones. En todos los casos, el mecanismo de corrosión es similar a un mecanismo de oxidación a alta temperatura durante las primeras horas. Cuando se establece el equilibrio, comienza el mecanismo de litiación, formándose diferentes capas de óxido doble de Li-metal sobre la superficie. Al final del proceso de corrosión, se forman una o dos capas internas de óxidos metálicos y una o dos capas externas porosas de óxidos de Li-metal. El mecanismo de corrosión de los aceros inoxidables AISI 304 y AISI 310S es función de su contenido en cromo. Las aleaciones de titanio muestran el mejor comportamiento frente a la corrosión en carbonatos fundidos debido a la formación de una capa protectora de óxidos mixtos de Li-Ti. Palabras clave: Espectroscopía de impedancia electroquímica, carbonatos fundidos, mecanismo de corrosión, aleación de titanio Study of the corrosion of different alloys in molten carbonate salts by electrochemical impedance spectroscopyIn the present work the corrosion behavior of different alloys (AISI 304, AISI 430 and TiAl6V) in molten carbonates at 650EC are compared. By using the Electrochemical Impedance Technique different corrosion parameters such as the corrosion rate and the oxyde concentration and others features of the different layers of corrosion products are "in situ" determined. Take into account, the corrosion product characterization by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Electrochemical impedance Spectroscopy (EIS) a corrosion mechanism for every tested alloy is proposed. In all cases, the corrosion mechanisms during the first hours are similar to a high temperature oxidation mechanism. When the equilibrium is established, the lithiation began by the formation of different double-layers on the surface of Li-metal oxydes. At the end of the corrosion process, one or two inner layers of metallic oxydes and one or two outer layers of Li-metal oxydes were formed. The corrosion mechanisms of the stainless steels (AISI 304 ans AISI 310S) are a function of their chromium contents. TiAl6V alloy showed the best behavior against the corrosion of molten carbonates by the formation of a protective layer of mixed Li-Ti oxydes.Keywords: Electrochemical Impedance Spectroscopy, molten carbonates, corrosion mechanism, stainless steels, titanium alloy. INTRODUCCIONLa corrosión de los materi...

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Accelerated Corrosion of Stainless Steels in the Presence of Molten Carbonate below 923 K

Cited by 13 publications

References 1 publication

Analysis of Oxygen Reduction on Pt Microelectrode with Polymer Electrolytes of Various Exchange Capacities

Analysis of Oxygen Reduction on Pt Microelectrode with Polymer Electrolytes of Various Exchange Capacities

Corrosion mechanisms in chloride and carbonate salts.

Estudio de la corrosión de diferentes aleaciones en sales de carbonatos fundidos con la técnica de espectroscopía de impedancia electroquímica

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