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<p>Chromium volatilization and interfacial oxidation are critical challenges limiting the long-term high-temperature service of ferritic stainless steel (FSS) interconnects in solid oxide fuel cells (SOFCs). In this study, a dense (Co,Mn)<sub>3</sub>O<sub>4</sub> spinel coating was fabricated on E-brite FSS substrates via a composite electrodeposition–thermal conversion approach conducted at 800&#xa0;°C. A homogeneous single-phase spinel was&#xa0;formed with a stable Cr<sub>2</sub>O<sub>3</sub> interlayer that suppressed chromium volatilization and surface degradation. Microstructural and elemental analyses confirmed the&#xa0;structural integrity. After 500&#xa0;h of oxidation at 800&#xa0;°C, the coating remained stable without cracking or spallation. The area-specific resistance (ASR) decreased to 7.9&#xa0;mΩ·cm<sup>2</sup>, an 80.7% reduction compared with the uncoated alloy (41.0&#xa0;mΩ·cm<sup>2</sup>), demonstrating improved electrical conductivity under prolonged exposure. This study provides a practical strategy that uses composite electrodeposition and thermal conversion to enhance both oxidation resistance and electrical performance of ferritic interconnects for intermediate-temperature SOFC applications.</p>

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Protective Co–Mn Spinel Coatings Prepared by Composite Electrodeposition for High-Temperature Service of Ferritic Stainless Steel

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • Jianli Song,
  • Yelong Li,
  • Weiqiang Wang,
  • Linyue Wang

摘要

Chromium volatilization and interfacial oxidation are critical challenges limiting the long-term high-temperature service of ferritic stainless steel (FSS) interconnects in solid oxide fuel cells (SOFCs). In this study, a dense (Co,Mn)3O4 spinel coating was fabricated on E-brite FSS substrates via a composite electrodeposition–thermal conversion approach conducted at 800 °C. A homogeneous single-phase spinel was formed with a stable Cr2O3 interlayer that suppressed chromium volatilization and surface degradation. Microstructural and elemental analyses confirmed the structural integrity. After 500 h of oxidation at 800 °C, the coating remained stable without cracking or spallation. The area-specific resistance (ASR) decreased to 7.9 mΩ·cm2, an 80.7% reduction compared with the uncoated alloy (41.0 mΩ·cm2), demonstrating improved electrical conductivity under prolonged exposure. This study provides a practical strategy that uses composite electrodeposition and thermal conversion to enhance both oxidation resistance and electrical performance of ferritic interconnects for intermediate-temperature SOFC applications.