Temperature-dependent selective oxidation processes for Ni-5Cr and Ni-4Al
Journal Article
·
· Corrosion Science
The selective oxidation of Ni-5Cr and Ni-4Al alloys is evaluated during high (800°C) and low (420°C) temperature exposures with the oxygen partial pressure moderated by a Ni/NiO powder buffer. Internal oxidation of Cr and Al is observed throughout the matrix and at grain boundaries at 800°C accompanied by the ejection of Ni onto the surface for both. At 420°C, matrix internal oxidation was eliminated and only Ni-4Al exhibited intergranular (IG) oxidation. Surprisingly, a protective surface oxide rapidly formed for Ni-5Cr blocking IG oxidation. This is contradictory to results in 330–360°C hydrogenated water environments where both alloys show IG oxidation.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1485424
- Report Number(s):
- PNNL-SA-129585
- Journal Information:
- Corrosion Science, Journal Name: Corrosion Science Journal Issue: C Vol. 139; ISSN 0010-938X
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
Theoretical and experimental analysis of selective oxidation of Fe–3Al–6Cr alloy with Zn vapor
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