The effect of de-siliconization on the oxidation behavior of AISI 430 stainless steel used for solid oxide fuel cell interconnect application was investigated. De-siliconization treatment was conducted via heating steel parts in an H2 environment. The de-siliconized substrates were then coated with a Mn1.5Co1.5O4 spinel coating, using wet spray method. For comparison, a similar coating process was applied on the as-received AISI 430 stainless steel specimens. Oxidation kinetics of coated interconnects were evaluated at 700, 800 and 900 °C in air. Results showed that the de-siliconization surface treatment decreased oxidation rates, with kinetic rates (g2 cm−4 s−1) of 4.39 × 10−14 at 700 °C, 1.71 × 10−13 at 800 °C and 1.62 × 10−12 at 900 °C, i.e., 55, 48 and 22% lower compared to the as-received coated substrates, respectively. Scanning electron microscopy images and EDS analysis confirmed the formation of SiO2-rich layer beneath the surface oxide scale for the oxidized specimens. The thickness of the formed scale for the de-siliconized specimens was noticeably lower than that of as-received ones. Step-wise electrical conductivity measurements showed that the de-siliconized specimens, compared to the as-received specimens, had higher electrical conductivity (~ 30–40%), implying lower oxidation degrees of the substrate and thus, better electrical performance under cathodic service condition of SOFC.

中文翻译：

---

固体氧化物燃料电池互连用 Mn1.5Co1.5O4 涂层脱硅 AISI 430 合金的氧化行为和电性能

研究了脱硅对用于固体氧化物燃料电池互连应用的 AISI 430 不锈钢氧化行为的影响。通过在 H2 环境中加热钢部件进行脱硅处理。然后使用湿喷涂法用Mn1.5Co1.5O4尖晶石涂层涂覆脱硅基体。为了进行比较，在收到的 AISI 430 不锈钢样品上应用了类似的涂层工艺。在空气中 700、800 和 900 °C 下评估了涂层互连的氧化动力学。结果表明，脱硅表面处理降低了氧化速率，动力学速率 (g2 cm−4 s−1) 在 700 °C 下为 4.39 × 10−14，在 800 °C 下为 1.71 × 10−13 和 1.62 × 10− 12 在 900 °C，即分别比原样的涂层基材低 55%、48% 和 22%。扫描电子显微镜图像和 EDS 分析证实了在氧化样品的表面氧化皮下形成了富含 SiO2 的层。脱硅试样形成的氧化皮厚度明显低于原样。逐步电导率测量表明，与原样相比，脱硅样品具有更高的电导率（~30-40%），这意味着基材的氧化度较低，因此在阴极服务下具有更好的电性能SOFC 的状况。