Evaluation of the Parabolic Rate Constant During Different Types of Oxidation Tests for Spinel Coated Fe–17%Cr Alloy

Ebrahimifar, Hadi; Zandrahimi, Morteza

doi:10.1007/s11085-010-9224-4

Cited by 22 publications

(6 citation statements)

References 34 publications

(36 reference statements)

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“…The diffusion of manganese to the cobalt oxide coating has been reported before [31,33,47] and is beneficial for the electrical properties of the coating. Moreover, with more manganese, the coefficient of thermal expansion of the spinel is closer to that of ferritic stainless steels [19,53], which should improve the adhesion of the coating during the thermal cycling.…”

Section: O 2 Atmospherementioning

confidence: 99%

Protective Coatings for Ferritic Stainless Steel Interconnect Materials in High Temperature Solid Oxide Electrolyser Atmospheres

et al. 2022

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Stainless steel interconnect materials used in solid oxide fuel cells and electrolysers need to be coated to improve oxidation resistance and to mitigate Cr-vaporization. This work aimed to explore the optimal steel/coating combinations suitable for use in reversible solid oxide stacks and evaluated (Co,Mn)3O4 spinel, LaFeO3 perovskite, Ce/Co and Y-based coatings, on AISI441 and Crofer 22 APU steels. The coatings were evaluated based on measurements of mass gain and oxide scale thickness after exposure at 700 and 800 °C to fuel side (90 vol.% H2O/10 vol.% H2) and air/oxygen side (pure O2) atmospheres. In pure O2, the most efficient coatings for limiting oxide scale formation and Cr evaporation, compared to the bare steel, were (Co,Mn)3O4 and CeCo on Crofer 22 APU. In 90 vol.% H2O/10 vol.% H2, the Y-based coating showed the largest improvement in oxidation resistance.

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Section: O 2 Atmospherementioning

confidence: 99%

Protective Coatings for Ferritic Stainless Steel Interconnect Materials in High Temperature Solid Oxide Electrolyser Atmospheres

et al. 2022

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“…is the fastest diffusing ion in chromia. The diffusion coefficients for Cr, Fe, and Ni ions are similar, but lower than that for Mn, which could explain why the Mn-rich spinel becomes one of the main oxide phases, even though the steels contain less than 1 % Mn [33][34][35][36]. Figure 10 demonstrates the SEM cross-sectional image (Fig.…”

Section: Oxid Metmentioning

confidence: 99%

Oxidation and Electrical Behavior of Mn-Co-Coated Crofer 22 APU Steel Produced by a Pack Cementation Method for SOFC Interconnect Applications

Ebrahimifar

Zandrahimi

2015

Oxid Met

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An issue associated with chromia-scale formation on ferritic stainless steels is an associated increase in electrical resistance over time, due to the oxide growth. Further, the migration of chromium via chromia-scale evaporation into solid oxide fuel cell (SOFC) cathodes can result in degradation in cell electrochemical performance. In this research, manganese and cobalt were deposited by the pack cementation method onto Crofer 22 APU ferritic stainless steel. Isothermal and cyclic oxidation was carried out to evaluate the role of coating materials during oxidation. Area-specific resistance (ASR) of the Mn-Co-coated substrates was also tested at 800°C. The results demonstrate that the coating layer transforms to MnCo 2 O 4 , CoFe 2 O 4 , CoCr 2 O 4 , and Co 3 O 4 spinels during oxidation. This scale is protective, and acts as an effective barrier against chromium migration into the outer oxide. Mn-Co oxide and cobalt oxides also cause a reduction in ASR, in comparison to that of bare steel.

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“…9,17,18 The key requirements for a protective coating include dense structure, high electronic conductivity, thermal, mechanical and chemical compatibility with the adjacent components and low diffusion coefficients of Cr and O. Among coating mate-rials, such as reactive element oxides, 11,[19][20][21][22][23][24] 72,73 Although the feasibility of these techniques has been substantiated, individual processes exhibit their characteristic drawbacks along with their advantages. For example, electroplating is suitable for uniformly applying thin film over a complex configuration, but the large negative reduction potential of manganese makes the control of the spinel composition extremely difficult.…”

mentioning

confidence: 99%

Highly Dense Mn-Co Spinel Coating for Protection of Metallic Interconnect of Solid Oxide Fuel Cells

Lee

Hong

Kim

et al. 2014

J. Electrochem. Soc.

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The major degradation issues of solid oxide fuel cells (SOFC) are associated with the oxide scale growth and Cr evaporation of the metallic interconnect. To address these challenges, a highly dense spinel oxide coating was fabricated on a ferritic stainless steel interconnect using a cost-competitive ceramic processing route. The nano-scale Mn 1.5 Co 1.5 O 4 spinel powder was synthesized using a glycine-nitrate method, and the particle agglomerates were effectively disintegrated by a high-energy attrition milling process. The spinel protective coating, which was applied by screen printing, was sintered to a nearly full density, without causing damage to the metallic substrate, by a high-temperature annealing process in a reducing environment, followed by re-oxidation at a moderate temperature. The dense spinel coating remarkably reduced the growth rate of chromia scale and restrained the evaporation of chromium species, as verified by area specific resistance (ASR) measurements and analysis on chromium distribution over the cross-section. Strong adhesion between the coating and substrate was confirmed after 500-hour operation. The sintering mechanism involved in reduction-oxidation heat-treatment was studied based on dilatometry measurements and microstructural features. The implication of the ASR change and the chromium migration for stability of practical SOFC stacks was discussed in detail.

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Evaluation of the Parabolic Rate Constant During Different Types of Oxidation Tests for Spinel Coated Fe–17%Cr Alloy

Cited by 22 publications

References 34 publications

Protective Coatings for Ferritic Stainless Steel Interconnect Materials in High Temperature Solid Oxide Electrolyser Atmospheres

Protective Coatings for Ferritic Stainless Steel Interconnect Materials in High Temperature Solid Oxide Electrolyser Atmospheres

Oxidation and Electrical Behavior of Mn-Co-Coated Crofer 22 APU Steel Produced by a Pack Cementation Method for SOFC Interconnect Applications

Highly Dense Mn-Co Spinel Coating for Protection of Metallic Interconnect of Solid Oxide Fuel Cells

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