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

Abstract

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.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1485423
Report Number(s):
PNNL-SA-129585
Journal ID: ISSN 0010-938X
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Corrosion Science
Additional Journal Information:
Journal Volume: 139; Journal Issue: C; Journal ID: ISSN 0010-938X
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
Ni-based alloys, preferential intergranular oxidation, internal oxidation, PWR primary water, TEM and SEM, EDS, Rhines pack, selective oxidation

Citation Formats

Kruska, Karen, Schreiber, Daniel K., Olszta, Matthew J., Riley, Brian J., and Bruemmer, Stephen M. Temperature-dependent selective oxidation processes for Ni-5Cr and Ni-4Al. United States: N. p., 2018. Web. doi:10.1016/j.corsci.2018.04.037.
Kruska, Karen, Schreiber, Daniel K., Olszta, Matthew J., Riley, Brian J., & Bruemmer, Stephen M. Temperature-dependent selective oxidation processes for Ni-5Cr and Ni-4Al. United States. doi:10.1016/j.corsci.2018.04.037.
Kruska, Karen, Schreiber, Daniel K., Olszta, Matthew J., Riley, Brian J., and Bruemmer, Stephen M. Sun . "Temperature-dependent selective oxidation processes for Ni-5Cr and Ni-4Al". United States. doi:10.1016/j.corsci.2018.04.037.
@article{osti_1485423,
title = {Temperature-dependent selective oxidation processes for Ni-5Cr and Ni-4Al},
author = {Kruska, Karen and Schreiber, Daniel K. and Olszta, Matthew J. and Riley, Brian J. and Bruemmer, Stephen M.},
abstractNote = {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.},
doi = {10.1016/j.corsci.2018.04.037},
journal = {Corrosion Science},
issn = {0010-938X},
number = C,
volume = 139,
place = {United States},
year = {2018},
month = {7}
}