Long-term Stability of MnCo Spinel Coatings Prepared by Electrophoretic Deposition at High Temperatures

doi:10.11902/1005.4537.2023.310

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (4): 972-978 DOI: 10.11902/1005.4537.2023.310

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Long-term Stability of MnCo Spinel Coatings Prepared by Electrophoretic Deposition at High Temperatures

WANG Bihui, LIU Ju, CUI Zhixiang, XIAO Bo, YANG Tianrang, ZHANG Naiqiang(

)

College of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

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WANG Bihui, LIU Ju, CUI Zhixiang, XIAO Bo, YANG Tianrang, ZHANG Naiqiang. Long-term Stability of MnCo Spinel Coatings Prepared by Electrophoretic Deposition at High Temperatures. Journal of Chinese Society for Corrosion and protection, 2024, 44(4): 972-978.

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Abstract

Spinel coatings Mn_1.5Co_1.5O₄ on steels SUS430 and Crofer22H were prepared via electrophoretic deposition, aiming to improve their high-temperature oxidation resistance and electrical conductivity as SOFC interconnector. Afterwards, their oxidation behavior at 700-800^oC and electrical conductivity after oxidation were characterized by means of intermittent weighing method, X-ray diffraction (XRD), scanning electron microscope (SEM) and 4-wire electrical resistance tester (ASR). The result showed that relatively dense coatings may be acquired by two-step sintering. The oxidation rate of Mn_1.5Co_1.5O₄/SUS430 oxidized at 800^oC for 1000 h is about (1-3) × 10^-14 g²·cm^-4·s^-1, and the oxidation rate constant decreases by 1-2 orders of magnitude as the temperature decreases. Mn_1.5Co_1.5O₄/SUS430 formed a thinner Cr-containing oxide scale due to its own low Cr content, at the same time, the Fe diffused outward from the substrate steel during the oxidation process to further promote the coating densification. Ultimately, after high temperature oxidation, the Mn_1.5Co_1.5O₄/SUS430 showed ASR values lower than those of the Mn_1.5Co_1.5O₄/Crofer22H.

Key words: solid oxide fuel cell ferrite steel spinel coating electrophoretic deposition

Received: 27 September 2023 32134.14.1005.4537.2023.310

ZTFLH:

TG172

Corresponding Authors: ZHANG Naiqiang, E-mail: zhnq@ncepu.edu.cn

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	WANG Bihui
	LIU Ju
	CUI Zhixiang
	XIAO Bo
	YANG Tianrang
	ZHANG Naiqiang

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.310 OR https://www.jcscp.org/EN/Y2024/V44/I4/972

Table 1 Nominal chemical compositions of SUS430 and Crofer22H steels

Fig.1 Schematic diagram of the preparation of the coating, and surface and cross-sectional morphologies of the as-prepared coating after sintering

Fig.2 Mass gain curves of Mn_1.5Co_1.5O₄/SUS430 (a) and Mn_1.5Co_1.5O₄/Crofer22H (b) samples during oxidation in air at different temperatures

Fig.3 Surface morphologies (a-f, h-m) and XRD patterns (g, n) of SUS430 (a-g) and Crofer22H (h-n) steels with Mn_1.5Co_1.5O₄ coating after oxidation for 200 h and 1000 h at 800^oC (a, b, h, i), 750^oC (c, d, j, k) and 700^oC (e, f, l, m)

Fig.4 Cross-sectional morphologies and elemental line of Mn_1.5Co_1.5O₄/SUS430 (a-c) and Mn_1.5Co_1.5O₄/Crofer22H (d-f) after oxidation for 1000 h at 800^oC (a, d), 750^oC (b, e) and 700^oC (c, f) (the thicknesses of Cr-containing oxide layers are shown in the insets)

Fig.5 ASR values of Mn_1.5Co_1.5O₄/steels at different temperatures after oxidation at 800^oC for 200 and 1000 h

Fig.6 Schematic illustration of diffusion process of main elements for Mn_1.5Co_1.5O₄ coated steels during oxidation

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