High-Temperature Corrosion Behaviors of Structural Materials for Lead-Alloy-Cooled Fast Reactor Application

The corrosion of nuclear-grade steels in lead–bismuth eutectic (LBE) complicates the realization of high coolant temperatures. Corrosion tests of T91, HT9, and SS316L were performed in static cells at 600 °C for 2000 h at an oxygen level of 10−6 wt.%. The obtained corrosion surfaces of post-processe...

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Bibliographic Details
Published in:Applied sciences 2021-03, Vol.11 (5), p.2349
Main Authors: Lee, Seung Gi, Shin, Yong-Hoon, Park, Jaeyeong, Hwang, Il Soon
Format: Article
Language:English
Subjects:
Bismuth
Chromium
Corrosion
Corrosion rate
Corrosion tests
Ethanol
Heat
High temperature
high-temperature corrosion
HT9
LBE
Lead base alloys
lead-alloy-cooled fast reactor
Nuclear reactors
Oxidation
Radiation
Scanning electron microscopy
Spallation
Spalling
Stainless steel
T91
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Summary:The corrosion of nuclear-grade steels in lead–bismuth eutectic (LBE) complicates the realization of high coolant temperatures. Corrosion tests of T91, HT9, and SS316L were performed in static cells at 600 °C for 2000 h at an oxygen level of 10−6 wt.%. The obtained corrosion surfaces of post-processed samples were characterized by several microscopy methods. Up to 1000 h, all the alloys exhibited an evolution of duplex oxide layers, which were spalled until 2000 h due to their increased thickness and decreased integrity. Following the spallation, a thin internal Cr-rich oxide layer was formed above the Cr-depleted zone for T91 and HT9. SS316L was penetrated by LBE down to 300 μm in severe cases. A comparison on the corrosion depths of the materials with regard to the parabolic oxidation law with abundant literature data suggests that it may lose its validity once the duplex layer is destroyed as it allows LBE to penetrate the metal substrate.
ISSN:2076-3417
2076-3417
DOI:10.3390/app11052349