Microstructure of oxide layers formed on zirconium alloy by air oxidation, uniform corrosion and fresh-green surface modification

Takashi Sawabe, Takeshi Sonoda, Masahiro Furuya, Shoichi Kitajima, Motoyasu Kinoshita, Moriyasu Tokiwai

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Cladding materials with superior corrosion resistance and anti-hydrogen pickup have been developed for high burnup nuclear fuel. We have suggested a surface modification of the cladding materials for this purpose and invented a new surface modification method "Fresh-Green". The Fresh-Green treatment oxidizes and carbonizes a material surface in the same process. Zircaloy-2 with the Fresh-Green treatment showed the improvement of corrosion resistance in autoclave tests. In order to investigate the effect of surface modifications on the corrosion resistance, a synchrotron radiation experiment and a TEM observation were performed on different oxide layers formed on Zircaloy-2. The oxide layers were formed by air-oxidation, an autoclave test and the Fresh-Green treatment. Crystal structures of all the samples were transformed as Zr > Zr3O > tetragonal ZrO2 > monoclinic ZrO2 from the matrix to the surface. Columnar grains of monoclinic zirconia were arranged unidirectionally in the Fresh-Green oxide layer treated at a low temperature. Diffusing capacity for oxygen influenced the crystal structure of the oxide layers.

Original languageEnglish
Pages (from-to)310-319
Number of pages10
JournalJournal of Nuclear Materials
Volume419
Issue number1-3
DOIs
Publication statusPublished - 2011 Dec 1
Externally publishedYes

Fingerprint

zirconium alloys
Zirconium alloys
Oxides
Surface treatment
corrosion
Corrosion
Corrosion resistance
Zircaloy 2 (trademark)
Oxidation
microstructure
Microstructure
oxidation
oxides
corrosion resistance
air
Autoclaves
Air
autoclaves
Crystal structure
nuclear fuel burnup

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)

Cite this

Microstructure of oxide layers formed on zirconium alloy by air oxidation, uniform corrosion and fresh-green surface modification. / Sawabe, Takashi; Sonoda, Takeshi; Furuya, Masahiro; Kitajima, Shoichi; Kinoshita, Motoyasu; Tokiwai, Moriyasu.

In: Journal of Nuclear Materials, Vol. 419, No. 1-3, 01.12.2011, p. 310-319.

Research output: Contribution to journalArticle

Sawabe, Takashi ; Sonoda, Takeshi ; Furuya, Masahiro ; Kitajima, Shoichi ; Kinoshita, Motoyasu ; Tokiwai, Moriyasu. / Microstructure of oxide layers formed on zirconium alloy by air oxidation, uniform corrosion and fresh-green surface modification. In: Journal of Nuclear Materials. 2011 ; Vol. 419, No. 1-3. pp. 310-319.
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