Functional properties of CuMn1.9Fe0.1O4-based coatings deposited on Crofer 22 APU steel exposed to selected pre-oxidation conditions

IF 8.3 2区工程技术 Q1 CHEMISTRY, PHYSICAL International Journal of Hydrogen Energy Pub Date : 2025-04-17 Epub Date: 2025-03-30 DOI:10.1016/j.ijhydene.2025.03.242

Monika Łazor , Yevgeniy Naumovich , Leszek Ajdys , Aleksey Yaremchenko , Agnieszka Żurawska , Paulina Wiecińska

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Abstract

The study investigates how pre-oxidation conditions affect the properties of cobalt-free protective coatings for solid oxide fuel cell (SOFC) interconnects. Coatings were composed of commercial spinel CuMn_1.9Fe_0.1O₄, applied to Crofer 22 APU via electrophoretic deposition (EPD).

Steel samples underwent pre-oxidation at 600–850 °C in air. Pre-oxidation at 800 °C proves to be the most effective, forming a uniform oxide layer that reduced ASR by over 50 % compared to pristine steel. All coatings demonstrate consistent thickness (13–26 μm) and low porosity (11–13 %), with structural characteristics that effectively limit gas-phase transport. Following sintering, XRD studies revealed a dual-phase composition of the coatings comprising spinel (Cu,Mn)₃O₄ and bixbyite (Mn,Fe)₂O₃, which is likely to enhance Cr trapping while remaining stable electrically and mechanically. Analysis using artificial neural networks (ANN) based on ASR results confirm that pre-oxidation at 800 °C ensures mid-term stability, with minimal chromium diffusion observed after 200 h of testing at 700 °C.

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预氧化条件下Crofer 22 APU钢表面沉积的cumn1.9 fe0.1 o4基涂层的功能特性

该研究探讨了预氧化条件如何影响固体氧化物燃料电池（SOFC）互连的无钴保护涂层的性能。以工业尖晶石CuMn1.9Fe0.1O4为材料，经电泳沉积（EPD）应用于Crofer 22 APU上。钢样品在空气中600-850℃进行预氧化。在800°C预氧化被证明是最有效的，形成均匀的氧化层，与原始钢相比，ASR降低了50%以上。所有涂层均具有一致的厚度（13-26 μm）和低孔隙率（11 - 13%），其结构特征有效地限制了气相输运。烧结后，XRD研究表明，涂层的双相组成包括尖晶石（Cu,Mn）3O4和bixbyite (Mn,Fe)2O3，这可能会增强Cr的捕获，同时保持电气和机械稳定性。基于ASR结果的人工神经网络（ANN）分析证实，800°C预氧化确保了中期稳定性，在700°C测试200 h后观察到的铬扩散最小。

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.