The effect of pre-heat treatment of AluChrom 318 on the corrosion behaviour and Cr evaporation in SOFC Cathode Air Pre-heater

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Abstract

An extremely low Cr evaporation rate was confirmed for the alumina-forming alloy (AluChrom 318) used in an SOFC Cathode Air Pre-Heater application in our previous work. In the current study, a pre-heat treatment was applied on the AluChrom 318 in order to achieve the formation of a protective alumina scale prior to SOFC application, further decreasing the oxidation rate and Cr evaporation. To examine this further, the effect of pre-heat treatment on the AluChrom 318 was investigated with two variables, namely; temperature (800 to 1100 °C) and dwelling time (0.5 to 4 hours). The results in this study show that the AluChrom 318 pre-treated at 1100 °C for 1 hour will form an α-Al2O3 scale leading to a 98% reduction of oxidation rate and 90% reduction of Cr evaporation compared to the non-treated AluChrom 318 under simulated SOFC cathode conditions.

Details

Original languageEnglish
Pages (from-to)2253-2260
Number of pages8
JournalECS Transactions
Volume91
Issue number1
Publication statusPublished - 8 Sep 2019
Event16th International Symposium on Solid Oxide Fuel Cells: SOFC XVI - Kyoto, Japan
Duration: 8 Sep 201913 Sep 2019
Conference number: 16

Keywords

  • SOFC, Degradation, Heat exchanger, Passivation, FeCrAlY steel