Effect of alloy composition on the oxide scale formation and electrical conductivity behavior of Co-plated ferritic alloys

Bi, Zhonghe; Zhu, J.H.; Du, Shiwen; Li, Y.T.

doi:10.1016/j.surfcoat.2013.04.018

Cited by 15 publications

(3 citation statements)

References 35 publications

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“…Similar to Cr, some Fe also di used outward from the substrate to the coating. According to the EDS results, the di usion distance of Fe was further than that of Cr at the same time, implying that the di usivity of Fe is greater than that of Cr, which agrees with the data in the literature [18]. With the extended conversion time, Fe was more uniformly dispersed in the coating.…”

Section: Phase Structures In the Converted Coatingssupporting

confidence: 90%

(Co,Mn)₃O₄ Spinel Coating for Protecting Metallic Interconnects Thermally Converted from an Electro‐Codeposited Co‐Mn₃O₄ Composite Coating

Yelong

Song

Zhu

et al. 2018

Advances in Materials Science and Engineering

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Electro-codeposition was used to prepare the Co and Co-Mn3O4 precursor coatings on ferritic stainless steel E-brite. Plated samples were exposed at 800°C in air for different durations (i.e., 10 min and 4 h) for thermal conversion of the deposited layer to a spinel coating. The converted layer was characterized with scanning electron microscopy/energy-dispersive spectroscopy (SEM/EDS) and X-ray diffraction (XRD). The results showed that after 10 min heat treatment, the plated Co layer was not fully oxidized and converted into a double-layer microstructure with an inner CoO layer and outer Co3O4 layer, while for the Co-Mn3O4 layer, the Mn3O4 particles were not completely dissolved into the oxide layer. After 4 h of exposure, the surface layer was fully converted into the Co3O4 or (Co,Mn)3O4 spinel coating. Though the Mn content in (Co,Mn)3O4 was relatively low, the Mn-doped spinel coating was advantageous over the pure cobalt spinel coating, as the thermally grown Cr2O3 scale at the coating/substrate interface was more compact and protective. Co diffusion from the deposited layer into the alloy substrate was observed for both coatings.

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Section: Phase Structures In the Converted Coatingssupporting

confidence: 90%

(Co,Mn)₃O₄ Spinel Coating for Protecting Metallic Interconnects Thermally Converted from an Electro‐Codeposited Co‐Mn₃O₄ Composite Coating

Yelong

Song

Zhu

et al. 2018

Advances in Materials Science and Engineering

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“…At 800°C, the bare substrate had a moderate scale ASR of 24 mΩ·cm 2 , while the (Co,Mn) 3 O 4 coated sample had a much lower ASR of 13 mΩ·cm 2 , which likely was due to the reduction in contact resistance with the presence of the highly-conductive spinel layer [33]. Moreover, with the addition of CeO 2 in the spinel layer, the ASR of the oxide scale was further reduced to 8 mΩ·cm 2 , which is among the lowest values of ASR reported for SOFC interconnect coatings on Cr 2 O 3 -forming alloys [24][25][26][33][34][35][36]. The significant reduction in ASR with the CeO 2 -doped coating could be attributed to the smaller thickness of the Cr 2 O 3 layer, which is much more electrically resistive than the spinel.…”

Section: Microstructures Before and After Thermal Conversionmentioning

confidence: 99%

CeO2-doped (Co,Mn)3O4 coatings for protecting solid oxide fuel cell interconnect alloys

Zhu

Lewis

et al. 2015

Thin Solid Films

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Reactive element-doped (Co,Mn) 3 O 4 spinel is considered as the most promising coating system to protect ferritic alloys for solid oxide fuel cell interconnect application. In this paper, a CeO 2 -doped (Co,Mn) 3 O 4 coating was synthesized on a Crofer 22 APU alloy substrate via electrolytic codeposition of a composite layer consisting of a Co matrix and embedded Mn 3 O 4 /CeO 2 particles, followed by thermal conversion of the deposited layer in air at elevated temperatures. After oxidation at 800°C in air for 250 h, no Cr penetration was detected in both the CeO 2 -doped and CeO 2 -free spinel coatings. However, CeO 2 doping significantly reduced the Cr 2 O 3 scale growth at the coating/substrate interface. An area specific resistance of 8 m ·cm 2 at800°C was achieved for the CeO 2 -doped coating sample, which was much lower than that of the CeO 2 -free coating sample (13 m ·cm 2 ) or the bare substrate (24 m ·cm 2 ) at the same temperature.CeO 2 doping in the spinel coating also improved the performance stability of the anode-supported cell in contact with the alloy interconnect.

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“…Spinel coating has the high conductivity, and its thermal expansion coefficient is matching with ferritic stainless steel. Therefore it shows good application prospects to reduce the growth of Cr2O3 film on stainless steel [9][10][11]. The electroplating method for spinel coatings is to pre-deposit a metal or alloy layer on a stainless steel substrate, and then to form a spinel coating by high temperature oxidation treatment.…”

Section: Introductionmentioning

confidence: 99%

Structure and properties of composite Ni–Co–Mn coatings on metal interconnects by electrodeposition

Shao

Guo

Sun

et al. 2019

Journal of Alloys and Compounds

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In order to obtain the high conductivity values and wide spinel stability region for solid oxide fuel cell interconnect, several multilayer Ni, Co and Mn coatings are electroplated and then oxidized in air to form spinel oxide layers. Potentiodynamic polarization curves in different simple solutions are tested to analyze the deposition behavior of Co and Mn. Microstructures and compositions of Ni-Co-Mn multi-layers by adjusting the thickness and deposition parameters are analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that area specific resistance value of sample B-Ni/Co after oxidation at 750℃ for 500h is the lowest among the coatings, and the resistance values at 700℃ and 800℃ are 35.3 and 31.7 mΩ‧cm 2 , respectively. When the Ni transition layer in the vicinity of coating/substrate interface is thick, it will lead to the outward diffusion and aggregation of element Fe to form Fe-rich oxide intermediate layer, which will affect the high-temperature performance of the coating. Pure Co and CoMn alloy coatings with a certain thickness can effectively prevent the inward diffusion of oxygen and the outward diffusion of Fe and Cr at high temperature. The thin Ni transition layer combined with the thick Co layer or CoMn layer has the best element diffusion inhibition and high temperature electrical properties during the long-term high-temperature oxidation process.

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Effect of alloy composition on the oxide scale formation and electrical conductivity behavior of Co-plated ferritic alloys

Cited by 15 publications

References 35 publications

(Co,Mn)₃O₄ Spinel Coating for Protecting Metallic Interconnects Thermally Converted from an Electro‐Codeposited Co‐Mn₃O₄ Composite Coating

(Co,Mn)₃O₄ Spinel Coating for Protecting Metallic Interconnects Thermally Converted from an Electro‐Codeposited Co‐Mn₃O₄ Composite Coating

CeO2-doped (Co,Mn)3O4 coatings for protecting solid oxide fuel cell interconnect alloys

Structure and properties of composite Ni–Co–Mn coatings on metal interconnects by electrodeposition

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Effect of alloy composition on the oxide scale formation and electrical conductivity behavior of Co-plated ferritic alloys

Cited by 15 publications

References 35 publications

(Co,Mn)3O4 Spinel Coating for Protecting Metallic Interconnects Thermally Converted from an Electro‐Codeposited Co‐Mn3O4 Composite Coating

(Co,Mn)3O4 Spinel Coating for Protecting Metallic Interconnects Thermally Converted from an Electro‐Codeposited Co‐Mn3O4 Composite Coating

CeO2-doped (Co,Mn)3O4 coatings for protecting solid oxide fuel cell interconnect alloys

Structure and properties of composite Ni–Co–Mn coatings on metal interconnects by electrodeposition

Contact Info

Product

Resources

About

(Co,Mn)₃O₄ Spinel Coating for Protecting Metallic Interconnects Thermally Converted from an Electro‐Codeposited Co‐Mn₃O₄ Composite Coating

(Co,Mn)₃O₄ Spinel Coating for Protecting Metallic Interconnects Thermally Converted from an Electro‐Codeposited Co‐Mn₃O₄ Composite Coating