Oxidation limited life times of chromia forming ferritic steels

Huczkowski, P.; Shemet, V.; Pirón-Abellán, J.; Singheiser, L.; Quadakkers, W. J.; Christiansen, N.

doi:10.1002/maco.200303798

Cited by 107 publications

(52 citation statements)

References 12 publications

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“…[26,27] As expected the degree of corrosion rate was less at 650°C, (Figure 14). Both the spinel (exposed 500 h) and the uncoated MS (exposed for 2000 h) samples have a few restricted areas where more extensive oxidation has taken place.…”

Section: Corrosion Resistance Of Coated Substratessupporting

confidence: 75%

Spinel-based coatings for metal supported solid oxide fuel cells

Stefan

Neagu

Blennow

et al. 2017

Materials Research Bulletin

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Graphical abstract2 Highlights  A successful method of solution infiltration is used for coating porous metals.  Continuous spinel coatings were successfully prepared on porous metal scaffolds.  Traces of Si favoured infiltration of aqueous solutions and forming spinel coatings. AbstractMetal supports and metal supported half cells developed at DTU are used for the study of a solution infiltration approach to form protective coatings on porous metal scaffolds. The metal particles in the anode layer, and sometimes even in the support may undergo oxidation in realistic operating conditions leading to severe cell degradation. Here, a controlled oxidation of the porous metal substrate and infiltration of Mn and/ or Ce nitrate solutions are applied for in situ formation of protective coatings. Our approach consists of scavenging the FeCr oxides formed during the controlled oxidation into a continuous and well adhered coating. The effectiveness of coatings is the result of composition and structure, but also of the microstructure and surface characteristics of the metal scaffolds.

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Section: Corrosion Resistance Of Coated Substratessupporting

confidence: 75%

Spinel-based coatings for metal supported solid oxide fuel cells

Stefan

Neagu

Blennow

et al. 2017

Materials Research Bulletin

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“…Both materials were of the type FeCrMn(Ti/La) [5][6][7]. The first material, designated as steel (A), was made of high purity elements, whereas the other steel (B) contained approximately 0.1 wt.-% each of Si and Al [17]. The steel compositions are given in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Growth Mechanisms and Electrical Conductivity of Oxide Scales on Ferritic Steels Proposed as Interconnect Materials for SOFC's

et al. 2006

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The oxidation behaviour of two ferritic steel variants was studied at 800 °C in air and the results were compared with data obtained for two Cr‐based materials. The mechanisms of scale formation were investigated for oxidation times ranging from a few minutes up to 6,000 hours. A number of conventional analysis techniques such as optical metallography, scanning electron microscopy, and X‐ray diffraction were used for scale characterization, in combination with two‐stage oxidation studies using an 18O‐tracer. It was found that the growth rates of the scales on the two steels were not only governed by the main scale forming alloying elements, Cr and Mn, but to a substantial extent by minor additions of Si and Al. At the test temperature of 800 °C these latter elements affect scale formation, although they are not directly incorporated in the surface scales. Independent of a detailed alloy composition, the conductivities of the scales on the ferritic steels were found to be higher than those of the surface scales formed on the Cr‐based materials studied.

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“…During operation, the Cr from the protective scale evaporates and is replaced by Cr diffusing from the bulk of the alloy. The Cr is consumed until it reaches a concentration of about 16% in the alloy, when break-away oxidation start to occur [21]. On the one hand, it is interesting to reduce interconnect thickness to reduce the cost associated with the interconnect steel, but on the other hand Asensio-Jimenez et al showed that the corrosion rate of interconnect steel increases for thinner plate thickness [22].…”

Section: Introductionmentioning

confidence: 99%

Post-experimental analysis of a solid oxide fuel cell stack using hybrid seals

Thomann¹,

Rautanen²,

Himanen³

et al. 2015

Journal of Power Sources

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h i g h l i g h t sPost-experimental analysis of a SOFC stack after 1800 h of operation. Microstructural analysis of the glass-coated hybrid seal. Materials interactions between glass-coated seals and Crofer 22 APU interconnects. Dual exposure of 0.2 mm thin Crofer 22 APU plates in stack operating conditions. a b s t r a c t A post-experimental analysis of a SOFC stack is presented. The stack was operated for 1800 h at 700 C with air and hydrogen and contained hybrid glass-Thermiculite 866 seals. The goal of this work was to investigate the sealing microstructure and possible corrosion during mid-term operation. It was found that hybrid seals could effectively compensate for manufacturing tolerances of cells and other components due to the compliance of the glass layer. Additionally, different interfaces were investigated for corrosion. Corrosion was not observed at two-phase interfaces such as Crofer 22 APU/glass, glass/electrolyte and glass/Thermiculite 866. The three-phase interface between Crofer 22 APU/glass/hydrogen exhibited no corrosion. Some evidence of non-systematic corrosion was found at the Crofer 22 APU/ glass/air interface. The possible reasons for the corrosion are discussed. Lastly, dual exposure to humid hydrogen and air of the 0.2 mm Crofer 22 APU interconnect had no detrimental effect on the corrosion compared to air exposure. Overall the hybrid seals used in combination with the thin interconnects were found to be a promising solution due to the low leak rate and limited material interactions.

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Oxidation limited life times of chromia forming ferritic steels

Cited by 107 publications

References 12 publications

Spinel-based coatings for metal supported solid oxide fuel cells

Spinel-based coatings for metal supported solid oxide fuel cells

Growth Mechanisms and Electrical Conductivity of Oxide Scales on Ferritic Steels Proposed as Interconnect Materials for SOFC's

Post-experimental analysis of a solid oxide fuel cell stack using hybrid seals

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