The influence of pre-treatment on the oxidation behavior of Co coated SOFC interconnects

Macauley, Chandra; Gannon, Paul; Deibert, Max C.; White, Preston

doi:10.1016/j.ijhydene.2010.04.113

Cited by 37 publications

(7 citation statements)

References 18 publications

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“…However, the Co-coating thickness has a strong influence on the thickness of the (Cr,Fe) 2 O 3 and (Co,Fe) 3 O 4 layers formed during the initial oxidation phase and, thus, also a strong influence on the ASR of the material at 650°C. It has previously been speculated that Fe is able to dissolve into the metallic Cocoating, and that this Fe-Co alloy is oxidized into (Co,Fe) 3 O 4 [22,29,39]. The findings in this study, however, do not support that theory.…”

Section: Discussioncontrasting

confidence: 99%

“…5) was never formed, and instead, only a protective Cr-rich (Cr,Fe) 2 O 3 scale was formed initially, as must have been the case for the pre-oxidized material. These results can also be compared to a similar study by Macauley et al [39] on Co-coated SS441 exposed at a substantially higher temperature (800°C) in air. Those authors also reported a beneficial effect of pre-oxidizing the steel before coating it with metallic Co (the formation of a (Co,Fe) 3 O 4 layer was prevented, and thinner Cr 2 O 3 scales were formed).…”

Section: Discussionmentioning

confidence: 57%

“…Those authors also reported a beneficial effect of pre-oxidizing the steel before coating it with metallic Co (the formation of a (Co,Fe) 3 O 4 layer was prevented, and thinner Cr 2 O 3 scales were formed). However, Macauley et al [39] used significantly longer pre-oxidation times (10 and 100 h at 800°C) and, as a consequence, achieved thicker oxide scales than were achieved with the short pre-oxidation step in this study.…”

Section: Discussionmentioning

confidence: 64%

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The Effect of Metallic Co-Coating Thickness on Ferritic Stainless Steels Intended for Use as Interconnect Material in Intermediate Temperature Solid Oxide Fuel Cells

et al. 2017

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The effect of metallic Co-coating thickness on ferritic stainless steels is investigated. This material is suggested to be used as interconnect material in intermediate temperature solid oxide fuel cells. Uncoated, 200-, 600-, 1000-, and 1500-nm Co-coated Sanergy HT is isothermally exposed for up to 500 h in air at 650°C. Mass gain is recorded to follow oxidation kinetics, and area-specific resistance (ASR) measurements are conducted on samples exposed for 168 and 500 h. The microstructure of the thermally grown oxide scales is characterized utilizing scanning electron microscopy and energy-dispersive X-ray analysis on broad ion beam-milled cross sections. A clear increase in ASR as a function of Cocoating thickness is observed. However, the increase in ASR, as an effect of a thicker Co-coating, is correlated with thicker (Cr,Fe) 2 O 3 scales formed on these materials and not to an increase in Co spinel top layer thickness.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionmentioning

confidence: 57%

Section: Discussionmentioning

confidence: 64%

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The Effect of Metallic Co-Coating Thickness on Ferritic Stainless Steels Intended for Use as Interconnect Material in Intermediate Temperature Solid Oxide Fuel Cells

et al. 2017

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“…The coatings were applied as metals, which presumably become oxidized during the first hours of high-temperature air exposure. A previous study 33 has shown that in single atmosphere air at 800 • C, after 10 hours, Co is fully oxidized to Co 3 O 4 and this oxide remains stable up to at least 100 hours. The Co presence on the LSM cathode surface could be related to a migration/diffusion process from the coating through the electrode, a volatilization/condensation process, or to some combination thereof.…”

Section: Resultsmentioning

confidence: 90%

Interactions between Metallic Interconnects and Ceramic Electrodes in SOFC Operating Environments: Air Side

Amendola

Gannon

Sofie

et al. 2012

J. Electrochem. Soc.

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Ferritic stainless steel (FSS) bipolar plates are widely used to interconnect individual cells in planar Solid Oxide Fuel Cell (SOFC) stacks. In this study, thin films of ceramic and cermet electrode materials, La 0.8 Sr 0.2 MnO 3 (LSM) for the cathode and Ni-Y 2 O 3 /ZrO 2 (Ni-YSZ) for the anode, were screen printed on Sanvik's Sanergy HT, a specialty FSS alloy (with and without Co or Co/Ce surface coatings). Samples were then placed in a test rig which allows simultaneous exposures to humidified (3% H 2 O) single (air/air) and dual atmospheres (air/H 2 ) at 800 • C for 100 hours. This research is focused on the FSS surface oxide layers and the phenomena governing materials interactions during realistic SOFC exposures that drive degradation. The surface oxide layer composition and morphology are heavily influenced by the dual atmosphere exposures and contact with electrode materials. For example, air-side surface oxide layers are generally thicker and contain more Fe than those formed in single-atmospheres, and surface oxide layer thickness and composition is altered in the presence of contacting electrodes in comparison with gas-only exposures. These and other recent data suggest that corrosion studies performed without relevant SOFC stack environments (e.g., air-only and without contacting electrodes) may not reveal all of the pertinent high-temperature behaviors.

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“…Como já foi mencionado na literatura, o cobalto puro não é um revestimento apropriado para interconector de SOFC (33). No entanto, em atmosferas redutoras com pré-tratamento esse procedimento pode ser uma alternativa, pois reduz substancialmente a taxa de oxidação dos aços inoxidáveis ferríticos e diminui a ASR em aproximadamente 40 vezes em relação as amostras não revestidas (34). As amostras revestidas com cobalto exibiram picos de CoFe2O4, formados provavelmente devido à reação entre Co3O4 e Fe, migrando do substrato para a superfície.…”

Section: Introductionunclassified

Obtenção de revestimento à base de Mn e Co por dip-coating sobre aço inoxidável ferrítico

Bervian¹,

Korb²,

Ludwig³

et al. 2021

Lat. Americ. J. of Develop.

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Estudos vêm sendo desenvolvidos para melhorar a resistência à oxidação em temperaturas elevadas do aço inoxidável ferrítico, os quais têm sido propostos para fabricação de interconectores de células a combustível do tipo óxido sólido de temperatura intermediária (IT-SOFC). Dentre os revestimentos empregados, os revestimentos cerâmicos de óxidos do tipo espinélio têm sido os mais aplicados. Nesse contexto, no presente trabalho foram obtidos revestimentos à base de Mn e Co sobre aço inoxidável ferrítico (AISI 430), utilizando a técnica de dip-coating. Os filmes obtidos foram caracterizados quanto à morfologia por MEV e quanto à composição elementar por EDS. Foi possível obter do revestimento à base de Mn e Co continuo e aderente sobre o substrato metálico.

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The influence of pre-treatment on the oxidation behavior of Co coated SOFC interconnects

Cited by 37 publications

References 18 publications

The Effect of Metallic Co-Coating Thickness on Ferritic Stainless Steels Intended for Use as Interconnect Material in Intermediate Temperature Solid Oxide Fuel Cells

The Effect of Metallic Co-Coating Thickness on Ferritic Stainless Steels Intended for Use as Interconnect Material in Intermediate Temperature Solid Oxide Fuel Cells

Interactions between Metallic Interconnects and Ceramic Electrodes in SOFC Operating Environments: Air Side

Obtenção de revestimento à base de Mn e Co por dip-coating sobre aço inoxidável ferrítico

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