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Temperature-dependent selective oxidation processes for Ni-5Cr and Ni-4Al

Journal Article · · Corrosion Science
 [1];  [1];  [1];  [1];  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Energy and Environment Directorate
The selective oxidation of Ni-5Cr and Ni-4 Al 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-4 Al exhibited intergranular (IG) oxidation. Surprisingly, a protective surface oxide rapidly formed for Ni-5Cr blocking IG oxidation. Finally, 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 Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1437016
Alternate ID(s):
OSTI ID: 1582845
OSTI ID: 22840753
OSTI ID: 1485423
OSTI ID: 1485424
Report Number(s):
PNNL-SA--129585; PII: S0010938X17318577
Journal Information:
Corrosion Science, Journal Name: Corrosion Science Vol. 139; ISSN 0010-938X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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