Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Transmission Electron Microscopy Characterization of Early Pre-Transition Oxides Formed on ZIRLOTM

  • Bae, Hoyeon (School of Mechanical Engineering, Pusan National University (PNU)) ;
  • Kim, Taeho (School of Mechanical and Nuclear Engineering, Ulsan National Institute of Science and Technology (UNIST)) ;
  • Kim, Ji Hyun (School of Mechanical and Nuclear Engineering, Ulsan National Institute of Science and Technology (UNIST)) ;
  • Bahn, Chi Bum (School of Mechanical Engineering, Pusan National University (PNU))
  • Received : 2015.11.03
  • Accepted : 2015.12.10
  • Published : 2015.12.31
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Abstract

Corrosion of zirconium fuel cladding is known to limit the lifetime and reloading cycles of fuel in nuclear reactors. Oxide layers formed on ZIRLO4^{TM}$ cladding samples, after immersion for 300-hour and 50-day in a simulated primary water chemistry condition ($360^{\circ}C$ and 20 MPa), were analyzed by using the scanning transmission electron microscopy (STEM), in-situ transmission electron microscopy (in-situ TEM) with the focused ion beam (FIB) technique, and X-ray diffraction (XRD). Both samples (immersion for 300 hours and 50 days) revealed the presence of the ZrO sub-oxide phase at the metal/oxide interface and columnar grains developed perpendicularly to the metal/oxide interface. Voids and micro-cracks were also detected near the water/oxide interface, while relatively large lateral cracks were found just above the less advanced metal/oxide interface. Equiaxed grains were mainly observed near the water/oxide interface.

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References

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