Microstructural understanding of the oxidation and inter-diffusion behavior of Cr-coated Alloy 800H in supercritical water

Yang, Jianqiao; Bai, Shuyuan; Sun, Jiyuan; Wu, Hao; Sun, Shenghan; Wang, Shuzhong; Li, Yanhui; Ma, Wenhao; Tang, Xingying; Xu, Donghai

doi:10.1016/j.corsci.2022.110910

Cited by 30 publications

(11 citation statements)

References 43 publications

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“…The detachment of the coating from the studied steel, here, should be primarily due to the polishing and mounting processes. In addition, the coating layer can serve as a barrier to inhibit the oxygen inward diffusion and the outward diffusion of cationic species from the substrate [11,64,65]. As for the 800H Ni-based alloy oxidized at high temperature, J. Yang et al [65] have recently found that the Cr coating could retard the Fe outward diffusion at a high temperature.…”

Section: O 2 and Co 2 Heat Treatment Atmospheres Of The Coating Processmentioning

confidence: 99%

“…In addition, the coating layer can serve as a barrier to inhibit the oxygen inward diffusion and the outward diffusion of cationic species from the substrate [11,64,65]. As for the 800H Ni-based alloy oxidized at high temperature, J. Yang et al [65] have recently found that the Cr coating could retard the Fe outward diffusion at a high temperature. For the AISI 430 stainless steel, we previously applied the Mn-Co oxide through slurry coating and conducted the oxidation test at 800 • C in O 2 -5%H 2 O [64].…”

Section: O 2 and Co 2 Heat Treatment Atmospheres Of The Coating Processmentioning

confidence: 99%

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Fabrication of Mn–Co Alloys Electrodeposited on AISI 430 Ferritic Stainless Steel for SOFC Interconnect Applications

Thanedburapasup

Wetchirarat

Muengjai

et al. 2023

Metals

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Mn–Co alloys were electroplated on AISI 430 stainless steel using an electrodeposition technique with the aim to reduce oxidation and chromium volatilization. The electroplating parameters were designed to improve the coating quality. The increased current density with decreased MnSO4 content resulted in a denser coating layer. A sample coated with 0.10 M CoSO4 and 0.50 MnSO4 at 350 mA cm−2 showed the best oxidation resistance after being oxidized at 800 °C for 90 h. The X-ray diffraction (XRD) result revealed that the oxide growth on the surface of the coated samples mainly formed oxides of MnCo2O4, MnCr2O4, and Cr2O3. The chromium volatilization was evaluated by exposing the coated samples to humidified synthetic air at 800 °C for 96 h. The mass flux of Cr volatilization was on the order of 10−11 g cm−2 s−1. Furthermore, different heat treatments in O2 and CO2 atmospheres were compared. Annealing in CO2 at 800 °C for 4 h helped increase the Mn–Co coating density. The relationship between the porosity and its failure behavior was also discussed.

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Section: O 2 and Co 2 Heat Treatment Atmospheres Of The Coating Processmentioning

confidence: 99%

Section: O 2 and Co 2 Heat Treatment Atmospheres Of The Coating Processmentioning

confidence: 99%

Fabrication of Mn–Co Alloys Electrodeposited on AISI 430 Ferritic Stainless Steel for SOFC Interconnect Applications

Thanedburapasup

Wetchirarat

Muengjai

et al. 2023

Metals

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“…[27][28][29] In addition, it has the advantages of a high melting point, good chemical stability, and good corrosion resistance. 30,31 The color for Cr 3+ samples arose from Cr 3+ d-d transitions at about 2.8 and 2.0 eV. 32 For perovskite structures, the unique optical properties of Cr 3+ in the Cr-O octahedral also promote its application in optical crystals and optical materials.…”

Section: Introductionmentioning

confidence: 99%

“…Luckily, LaCrO 3 perovskite oxides have a stable structure and the coexistence of different valence states of elements, as well as excellent ferroelectric and photothermal effects 27–29 . In addition, it has the advantages of a high melting point, good chemical stability, and good corrosion resistance 30,31 . The color for Cr 3+ samples arose from Cr 3+ d–d transitions at about 2.8 and 2.0 eV 32 .…”

Section: Introductionmentioning

confidence: 99%

Combined experimental and DFT study on high‐temperature thermochromism of Co‐doped LaCrO₃ coating for thermal indicator

Tong

Wang

et al. 2023

J Am Ceram Soc.

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Noncontact temperature measurement using thermochromic materials is vital in the field of temperature indication, but the related mechanisms behind thermochromic behavior are diverse and high complexity, and the color‐temperature correspondence is poorly explored. This paper systematically studied the thermochromic mechanisms and color‐temperature correspondence in the cobalt‐doped LaCrO3 coatings via experiment and density functional theory study. The coatings appear reversible thermochromism from green to black with temperature and composition, functions from room temperature to 700°C. This thermochromism is attributed to the lattice expansion and bandgap reduction as the temperature increase, and a model of temperature effect bandgap was proposed. Meanwhile, the coating temperature can be inferred from the color change because the CIE chromaticity coordinate of the coating varies linearly with temperature, and the mean relative error of thermochromic measurements is 8.28%. Furthermore, the cobalt doped introduces impurity energy levels and enhances the interaction between photons and carriers, which reduce the bandgap and increase the absorption in the visible spectrum resulting in darker colors. This work provides a stable and efficient high‐temperature thermochromic coating that has a wide thermochromic temperature range and clear color‐temperature correspondence, which shows broad application prospects in the field of thermal indication at high temperatures.

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“…In addition to the basic Ni element, there is also a certain amount of Cr, B, Si and other elements in the Ni-based self-fluxing alloy powder. Cr is a solid solution element that can produce lattice distortion with Ni in a limited solid solution, reducing the layer misalignment energy and atomic diffusion ability, forming a stable solid solution, and resulting in solid solution strengthening and improving the hardness, corrosion resistance and wear resistance of the coatings [9][10][11][12]. At the same time, the presence of Cr is conducive to the formation of dispersed fine carbide in the coating, B and Si can purify the molten pool environment and improve the quality of the coatings.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and properties of plasma cladding Ni-based alloy coated on 40Cr Surface

Xun,

Liu,

Pan

et al. 2023

Surf. Topogr.: Metrol. Prop.

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Three Ni-based alloys (Ni60, Ni65, Ni60W) were selected to be coated on the surface of 40Cr and 20 steel. The microstructure, phase composition and elemental distribution of the coatings were characterised respectively to discuss the effects of different substrates, cladding materials, and preparing processes. The corrosion and thermal fatigue behaviour of the coatings were investigated. The results show that the coatings prepared by plasma cladding have a dense microstructure with few defects and a white bright band of a certain thickness was formed between the coating and the substrate. The white bright band between the coating prepared by flame spraying and the substrate was not obvious. The main phase compositions of the coatings are Cr23C6, Cr7C3, Ni2.9Cr0.7Fe0.36 and FeNi3 phases, with the W2C phase also present in the Ni60W coating. The heat-affected zone (HAZ) of the coating is influenced by the coating preparing processes, substrate material and process state of substrates: the size of the HAZ of the plasma cladded coating is smaller than that of the flame sprayed coating, the HAZ of the 40Cr substrate is smaller than that of the 20 steel, and the HAZ of the tempered 40Cr substrate is smaller than that of the annealed 40Cr substrate. The Ni-based alloy coating can effectively improve the surface hardness of the substrate. The Ni65 alloy powder is the most effective (HV0.5992), followed by the Ni60W alloy powder (HV0.5798) and finally the Ni60 alloy powder (HV0.5712). The Ni65 alloy coating has the relatively best thermal fatigue properties, followed by the Ni60W alloy coating and the Ni60 alloy coating is the relatively worst. At the same time, the corrosion resistance of different Ni-based alloy coatings is consistent with the thermal fatigue properties of the coatings.

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Microstructural understanding of the oxidation and inter-diffusion behavior of Cr-coated Alloy 800H in supercritical water

Cited by 30 publications

References 43 publications

Fabrication of Mn–Co Alloys Electrodeposited on AISI 430 Ferritic Stainless Steel for SOFC Interconnect Applications

Fabrication of Mn–Co Alloys Electrodeposited on AISI 430 Ferritic Stainless Steel for SOFC Interconnect Applications

Combined experimental and DFT study on high‐temperature thermochromism of Co‐doped LaCrO₃ coating for thermal indicator

Microstructure and properties of plasma cladding Ni-based alloy coated on 40Cr Surface

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Microstructural understanding of the oxidation and inter-diffusion behavior of Cr-coated Alloy 800H in supercritical water

Cited by 30 publications

References 43 publications

Fabrication of Mn–Co Alloys Electrodeposited on AISI 430 Ferritic Stainless Steel for SOFC Interconnect Applications

Fabrication of Mn–Co Alloys Electrodeposited on AISI 430 Ferritic Stainless Steel for SOFC Interconnect Applications

Combined experimental and DFT study on high‐temperature thermochromism of Co‐doped LaCrO3 coating for thermal indicator

Microstructure and properties of plasma cladding Ni-based alloy coated on 40Cr Surface

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Combined experimental and DFT study on high‐temperature thermochromism of Co‐doped LaCrO₃ coating for thermal indicator