Molybdenum effect on oxidation resistance and electric conduction of ferritic stainless steel for SOFC interconnect

Yun, Dae Won; Seo, Hyung Suk; Jun, Jae Ho; Lee, Jae-Myung; Kim, Kyoo Young

doi:10.1016/j.ijhydene.2012.04.013

Cited by 51 publications

(15 citation statements)

References 25 publications

(18 reference statements)

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“…Yun et al [76] found that Mo addition did not have a significant effect on the evaporation of Cr at 800 °C. Mo can be concentrated at the steel/oxide interface or a Mo -rich second phase may form at the steel/oxide interface and the metal grain boundary, and thus improve adhesion of the Cr 2 O 3 scale to the steel [76,78,79].…”

Section: Discussionmentioning

confidence: 97%

Breakaway oxidation behaviour of ferritic stainless steels at 1150°C in humid air

et al. 2016

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The breakaway oxidation behaviour of ferritic stainless steels 430, 443 and 445 has been investigatedat 1150•C in humid air. The oxidation kinetics exhibited significant differences among the three ferriticstainless steels. A uniform and steady growing oxide scale was developed on the 430 steel with an evensteel/oxide interface. Local breakdown of the initially protective oxide scale occurred and oxide noduleswere developed on the 443 and 445 stainless steels, resulting in irregular and rough steel/oxide interfaces. The breakaway oxidation behaviour was significantly influenced by the microstructure and thecomposition of the oxide scale. The Mn-Cr spinel oxide formed on top of the Cr2O3scale in Mo alloying445 steel can greatly minimise the Cr depletion.

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Section: Discussionmentioning

confidence: 97%

Breakaway oxidation behaviour of ferritic stainless steels at 1150°C in humid air

et al. 2016

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“…12 Beyond the base alloys, the addition of minor alloying elements such as molybdenum (Mo) to the nickel-based alloys can have positive or negative impacts on the oxidation and corrosion behavior depending on the environment. 13 For high-temperature oxidation in dry air, Mo may have favorable effects on the selective oxidation of chromium, 14 but the formation of volatile MoO 3 degrades the oxidation resistance. 15 In different environments, Mo has been found to enhance the hot corrosion resistance in a chloride-containing vapor, [16][17] as well as improve the passivation, pitting resistance, and crevice corrosion in aqueous chloride media.…”

Section: Introductionmentioning

confidence: 99%

In Situ Observations of Early Stage Oxidation of Ni-Cr and Ni-Cr-Mo Alloys

Güleç

Andolina

et al. 2018

Corrosion

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Results of in situ transmission electron microscopy experiments on the early stage oxidation of Ni-Cr and Ni-Cr-Mo alloys are reported. An epitaxial rock-salt oxide with compositions outside the conventional solubility limits initiated at the surface of both alloys, progressing by a layer-by-layer mode. Kirkendall voids were found in Ni-Cr alloys near the metal/oxide interface, but were not seen in the Ni-Cr-Mo. The voids initiated in the oxide then diffused to the metal/oxide interface, driven by the misfit stresses in the oxide. A sequential oxide initiation was observed in NiCr alloys: rock-salt → spinel → corundum; however, for NiCrMo alloys, the metastable Ni 2-x Cr x O 3 (corundum structure) phase formed shortly after the growth of the rock-salt phase. Chemical analysis shows that solute atoms were captured in the initial oxide before diffusing and transforming to more thermodynamically stable phases. The results indicate that Mo doping inhibits the formation of Kirkendall voids via an increase in the nucleation rate of corundum, which was verified by density functional theory calculations.

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“…The Crofer22 has been approved as a promising SOFC interconnect metal by many researchers for the last several years [8,9]. However, its material cost is still very high since it has to be fabricated by vacuum melting process due to the alloying with rare earth metal and very low Si content near 0.01 mass% [10]. Therefore, the development of low cost interconnect metal that fulfills the requirements of SOFC interconnect is one of the most important issues for the commercialization of SOFC.…”

Section: Introductionmentioning

confidence: 99%

Development of a new cost effective Fe–Cr ferritic stainless steel for SOFC interconnect

Kim

et al. 2015

International Journal of Hydrogen Energy

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Molybdenum effect on oxidation resistance and electric conduction of ferritic stainless steel for SOFC interconnect

Cited by 51 publications

References 25 publications

Breakaway oxidation behaviour of ferritic stainless steels at 1150°C in humid air

Breakaway oxidation behaviour of ferritic stainless steels at 1150°C in humid air

In Situ Observations of Early Stage Oxidation of Ni-Cr and Ni-Cr-Mo Alloys

Development of a new cost effective Fe–Cr ferritic stainless steel for SOFC interconnect

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