Breakaway oxidation of zirconium alloys exposed to steam around 1000 °C

•Strong effect of oxidation temperature around 1000 °C on breakaway oxidation.•No significant effect of small chemical variations around nominal composition of M5Framatome.•Effect of one-side versus two-side oxidation in some cases.•Large hydrogen pickup fraction after the onset of breakaway oxidati...

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Bibliographic Details
Published in:Corrosion science 2020-11, Vol.176 (108936), p.108936-21, Article 108936
Main Authors: Le Saux, Matthieu, Brachet, Jean-Christophe, Vandenberghe, Valérie, Ambard, Antoine, Chosson, Raphaël
Format: Article
Language:English
Subjects:
Breakaway oxidation
Condensed Matter
Engineering Sciences
High temperature
LOCA
M5Framatome
Materials
Materials Science
Oxidation
Physics
Zircaloy-4
Zircaloys (trademark)
Zirconium alloys
Zirconium base alloys
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Summary:•Strong effect of oxidation temperature around 1000 °C on breakaway oxidation.•No significant effect of small chemical variations around nominal composition of M5Framatome.•Effect of one-side versus two-side oxidation in some cases.•Large hydrogen pickup fraction after the onset of breakaway oxidation.•Microstructural and microchemical specific features associated with breakaway oxidation. The breakaway oxidation of Zircaloy-4 and M5Framatome alloys oxidized in flowing steam around 1000 °C was studied. The influences of oxidation temperature between 950 and 1050 °C, one-side versus two-side oxidation and chemical variations around the nominal composition of M5Framatome were investigated. Breakaway oxidation is sensitive to the oxidation temperature, the material and the oxidation type. A phenomenological mechanism for breakaway oxidation is postulated on the basis of microstructural and microchemical analyses.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2020.108936