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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

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