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

Hannes Falk Windisch (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Jan-Erik Svensson (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Jan Froitzheim (Institutionen för kemi och kemiteknik, Oorganisk miljökemi)
Journal of Power Sources (0378-7753). Vol. 287 (2015), p. 25-35.
[Artikel, refereegranskad vetenskaplig]

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 °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.

Nyckelord: Cr vaporization, Crofer, Interconnect, Oxidation, Sanergy, SOFC



Denna post skapades 2015-06-23. Senast ändrad 2015-06-26.
CPL Pubid: 218676

 

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