The effect of temperature on chromium vaporization and oxide scale growth on interconnect steels for Solid Oxide Fuel Cells

JOURNAL OF POWER SOURCES

卷:287

Article

Falk-Windisch, Hannes¹  Svensson, Jan Erik¹  Froitzheim, Jan¹ 

[1] Chalmers, High Temp Corros Ctr, S-41296 Gothenburg, Sweden

关键词: SOFC;    Interconnect;    Cr vaporization;    Oxidation;    Crofer;    Sanergy;   

DOI  :  10.1016/j.jpowsour.2015.04.040

来源: Elsevier

【 摘 要 】

Chromium vaporization and oxide scale growth are probably the two most important degradation mechanisms associated with the interconnect in Solid Oxide Fuel Cells (SOFCs) when Cr2O3-forming alloys are used as the interconnect material. This study examines the influence of temperature on both mechanisms. Two commercially available steels; Crofer 22 H and Sanergy HT, were isothermally exposed at 650, 750 and 850 degrees C in an air-3% H2O atmosphere with a high flow rate. Volatile chromium species were collected using the denuder technique. The microstructure of thermally grown oxide scales was characterized using Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray Analysis (EDX) and X-Ray Diffraction (XRD). The findings of this study show that although Cr evaporation is reduced with lower temperature, its relative importance compared to oxide scale growth is greater. (C) 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

【 授权许可】

Free