Abstract
The corrosion behavior of the aluminum-alloyed austenitic steels Fe-18Ni-12Cr-2.9Al and Fe-18Ni-12Cr-2.3Al-Nb-C was investigated at 700 °C in static Pb for 1000 h as a function of the concentration of dissolved oxygen in the liquid metal. In Pb with ~ 5 × 10 –9 mass % dissolved oxygen, both steels showed dissolution. Depth of corrosion averaged 67 (± 18) µm and 78 (± 25) µm for Fe-18Ni-12Cr-2.3Al-Nb-C and Fe-18Ni-12Cr-2.9Al, respectively. In Pb with higher oxidation potential of 2 × 10 –6 mass %O, both steels showed protective and accelerated oxidation. The protective thin oxide film (≤ 1 µm) was composed of outermost Fe-rich, intermediate Cr-rich and inner Al-rich sublayers. The thicker oxide scale was of irregular thickness (2 ÷ 30 µm) and consisted of Fe–Cr mixed oxide with Ni-rich metallic inclusions.
| Original language | English |
|---|---|
| Pages (from-to) | 589-602 |
| Number of pages | 14 |
| Journal | High Temperature Corrosion of Materials |
| Volume | 101 |
| Issue number | 3 |
| DOIs | |
| State | Published - Jun 2024 |
ASJC Scopus subject areas
- Metals and Alloys
- Materials Chemistry
- Inorganic Chemistry
- Materials Science (miscellaneous)
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