Corrosion behaviour of Alloy 600 containing oxide inclusions exposed to primary water of pressurised water reactors
Source abstract
Abstract
Intergranular stress corrosion cracking (IGSCC) was observed in an Alloy 600 bottom-mounted instrumentation (BMI) nozzle of a French pressurised water reactor (PWR). Destructive examinations of the component revealed the presence of oxide inclusions extending along the crack, which were identified as likely to promote IGSCC initiation. In this context, the corrosion behaviour of Alloy 600 laboratory heats containing aluminium and/or magnesium oxide inclusions was investigated in primary water at 325°C and 360°C for oxidation times ranging from 10 h to 7000 h. Complete dissolution and/or detachment of the oxide inclusions was observed after a few hundred hours of exposure to primary water, and the presence of magnesium borate was locally detected. Furthermore, blister-like features consisting of Ni2FeBO5 filaments embedded in a double nickel chromite spinel layer were characterised on the surface of Alloy 600 in the vicinity of some alumina inclusions while, a micron-thick oxide layer was formed at the former interface with the pre-existing inclusions.
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Research context
OpenAlex topics: Nuclear Materials and Properties · High-Temperature Coating Behaviors · Hydrogen embrittlement and corrosion behaviors in metals
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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