Effect of Alloy Composition on the Oxidation Behaviour and Cr Vaporisation of High-Cr Steels for SOFC Cathode Air Preheater

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Colleges, School and Institutes

External organisations

  • Korean Institute of Energy Research (KIER)

Abstract

We investigated the capability of aluminised and alumina-forming alloys to reduce the Cr vaporisation and increase the corrosion resistance by the growth and formation of alumina scale. The Cr evaporation tests have been performed for Inconel 625, AluChrom 318, SS309 and aluminised SS309 by applying a denuder technique at 850 °C with 6 L/min airflow and 3 vol% H2O to simulate the cathode atmosphere in SOFC. Chemical analysis of the oxide scales formed was subsequently studied by XRD and SEM/EDX. Inconel 625 and uncoated SS309 exhibited relatively higher Cr evaporation due to a Cr-rich oxide layer, in comparison with other materials. The chromium evaporation of uncoated SS309 was dramatically decreased by aluminising. The experiments showed that Cr retention of the aluminised surface of SS309 is comparable to that of alumina-forming steel, AluChrom 318, over 168 hours. However, spallation of PVD applied alumina scales was detected for aluminised SS309 after 1000 hours oxidation.

Details

Original languageEnglish
Title of host publicationProceedings of SOFC XV
EditorsSubhash C. Singhal, T. Kawada
Publication statusPublished - 23 Jul 2017
Event15th International Symposium on Solid Oxide Fuel Cells, SOFC, 2017 - Hollywood, FL, U.S.A., Hollywood, United States
Duration: 23 Jul 201728 Jul 2017
http://www.electrochem.org/sofc-xv

Publication series

NameECS Transactions
PublisherECS
Number1
Volume78

Conference

Conference15th International Symposium on Solid Oxide Fuel Cells, SOFC, 2017
Abbreviated titleSOFC XV
CountryUnited States
CityHollywood
Period23/07/1728/07/17
Internet address

Keywords

  • SOFC, heat exchanger, corrosion, chromium