Applying the Protective Mn–Co–La2O3 Coating on Crofer 22 APU Ferritic Stainless Steel Used as Solid Oxide Fuel Cell Interconnects

IF 2.9 2区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
Farhad Mohsenifar, Hadi Ebrahimifar, Ahmad Irannejad
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Abstract

This research studies the effect of Mn–Co–La2O3 coating synthesized by the electrodeposition method on the oxidation resistance and electrical conductivity of the Crofer 22 APU stainless steel interconnect plates in solid oxide fuel cells. The test samples were characterized by a field emission scanning electron microscope (FESEM) equipped with energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The oxidation kinetics of the coated and uncoated samples were studied by tracking their weight changes over time at 800 °C, showing that the oxidation mechanism for all samples follows the parabolic law. Lower oxidation rate constant (kp) values of the coated sample compared with that of the uncoated one indicated a reduction in the oxidation rate of the steel substrate in the presence of the Mn–Co–La2O3 coating. The examination of the cross-section of different samples after the isothermal oxidation for 500 h at 800 °C exhibited that applying the composite coating leads to a decrease in the thickness of the chromia layer formed on the steel surface. Furthermore, under these conditions, the area-specific resistance (ASR) of the coated sample (13.11 mΩ cm2) is significantly lower than that of the uncoated one (41.45 mΩ cm2).

Abstract Image

在用作固体氧化物燃料电池互连器件的 Crofer 22 APU 铁素体不锈钢上应用 Mn-Co-La2O3 保护涂层
摘要 本研究探讨了电沉积法合成的 Mn-Co-La2O3 涂层对固体氧化物燃料电池中 Crofer 22 APU 不锈钢互连板的抗氧化性和导电性的影响。测试样品由配备了能量色散光谱仪(EDS)、X 射线衍射仪(XRD)和 X 射线光电子能谱仪(XPS)的场发射扫描电子显微镜(FESEM)进行表征。通过跟踪 800 °C 下涂层和未涂层样品的重量随时间的变化,研究了它们的氧化动力学,结果表明所有样品的氧化机制都遵循抛物线规律。与未涂层样品相比,涂层样品的氧化速率常数(kp)值较低,这表明在 Mn-Co-La2O3 涂层的存在下,钢基体的氧化速率降低。在 800 °C 下等温氧化 500 小时后,对不同样品横截面的检测表明,涂覆复合涂层会导致钢表面形成的铬层厚度减小。此外,在这些条件下,涂层样品的面积电阻(ASR)(13.11 mΩ cm2)明显低于未涂层样品(41.45 mΩ cm2)。
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来源期刊
Acta Metallurgica Sinica-English Letters
Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
6.60
自引率
14.30%
发文量
122
审稿时长
2 months
期刊介绍: This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.
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