Abstract
Ferritic (FeCrX) alloys forming a protective chromium oxide layer (Cr2O3) are the preferred materials for the interconnect component in solid oxide fuel cells (SOFC).
Due to their oxidation rate in moist air, these alloys undergo degradation causing an increase in interconnect electrical contact resistance and formation of (poisonous) volatile chromium species. Developing coating agents and techniques that protect these alloys and lower their degradation rates is the current approach to extending SOFC lifetime .
In this paper we examine the oxidation behaviour of an uncoated ferritic stainless steel interconnect for a supposed SOFC system operating at 850oC.
A precursor numerical model with respect to the oxidation and evaporation kinetics of the steel has been developed. The model is able to predict the weight gain of the samples upon oxidation, the oxide film thickness, the volatilisation of chromium, and the useable lifetime of interconnects based on chromium depletion calculations.
Due to their oxidation rate in moist air, these alloys undergo degradation causing an increase in interconnect electrical contact resistance and formation of (poisonous) volatile chromium species. Developing coating agents and techniques that protect these alloys and lower their degradation rates is the current approach to extending SOFC lifetime .
In this paper we examine the oxidation behaviour of an uncoated ferritic stainless steel interconnect for a supposed SOFC system operating at 850oC.
A precursor numerical model with respect to the oxidation and evaporation kinetics of the steel has been developed. The model is able to predict the weight gain of the samples upon oxidation, the oxide film thickness, the volatilisation of chromium, and the useable lifetime of interconnects based on chromium depletion calculations.
| Original language | English |
|---|---|
| Title of host publication | ECS Meeting Abstracts: |
| Subtitle of host publication | SOFC-XV: 15th International Symposium on Solid Oxide Fuel Cells July 23, 2017 - July 28, 2017 Hollywood, FL |
| Editors | Subhash Singhal |
| Place of Publication | Pennington |
| Publisher | Electrochemical Society Inc. |
| Number of pages | 10 |
| Volume | MA2017-03 |
| Publication status | Published - 23 Jul 2017 |
| Event | 15th International Symposium on Solid Oxide Fuel Cells, SOFC, 2017 - Hollywood, FL, U.S.A., Hollywood, United States Duration: 23 Jul 2017 → 28 Jul 2017 http://www.electrochem.org/sofc-xv |
Conference
| Conference | 15th International Symposium on Solid Oxide Fuel Cells, SOFC, 2017 |
|---|---|
| Abbreviated title | SOFC XV |
| Country/Territory | United States |
| City | Hollywood |
| Period | 23/07/17 → 28/07/17 |
| Internet address |
Keywords
- SOFC
- Corrosion
- Steel
- Chromium
- Oxide Layer
- protective coatings
ASJC Scopus subject areas
- Mechanics of Materials
- Energy Engineering and Power Technology
- Renewable Energy, Sustainability and the Environment
