Abstract
Microstructure characterization of corrosion behavior of an alumina forming austenitic (AFA) steel exposed to supercritical carbon dioxide was conducted at 450-650°C and 20MPa. At low temperature and short exposure times, the oxidation kinetics were parabolic and the oxide scales were mainly composed of protective and continuous Al2O3 and (Cr, Mn)-rich oxide layers. As the temperature and exposure time increased, the AFA steel gradually suffered breakaway oxidation and its oxide scales showed a multilayer structure mainly composed of Fe3O4, (Cr, Fe)3O4, NiFe/FeCr2O4/Cr2O3/Al2O3, FeCr2O4/Al2O3, and NiFe/Cr2O3/Al2O3, in sequence. The corrosion mechanism based on the microstructure evolution is discussed in detail.
| Original language | English |
|---|---|
| Pages (from-to) | 67-76 |
| Number of pages | 10 |
| Journal | Corrosion Science |
| Volume | 82 |
| DOIs | |
| State | Published - May 2014 |
Keywords
- A. Stainless steels
- B. SEM
- B. STEM
- C. Carburization
- C. High temperature corrosion
- C. Oxidation
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