Journal
CORROSION SCIENCE
Volume 90, Issue -, Pages 606-613Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2014.11.006
Keywords
Nickel; Alloy; Stress corrosion; Internal oxidation; Selective oxidation
Funding
- University Network of Excellence in Nuclear Engineering (UNENE)
- Natural Sciences and Engineering Research Council of Canada (NSERC)
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Alloy 690 was exposed to a hydrogenated steam environment at 480 degrees C and 1 bar, considered to simulate primary water in a pressurized water reactor. The possibility of internal oxidation in Alloy 690 was evaluated and the likely relevance to SCC in primary water is discussed. Initial surface imaging revealed intragranular metallic Ni nodules, indicating that internal oxidation had occurred. Grain boundaries provided a short circuit for outward Cr diffusion and an external surface oxide was observed at grain boundaries. FIB trenching was used to study oxidation phenomena occurring beneath the surface and EDX elemental maps were generated. (C) 2014 Elsevier Ltd. All rights reserved.
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