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Oxide evolution on Alloy X-750 in simulated BWR environment

Silvia Tuzi (Institutionen för fysik, Materialens mikrostruktur (Chalmers)) ; K. Goransson ; Seikh Rahman (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Sten G. Eriksson (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Fang Liu (Institutionen för fysik, Materialens mikrostruktur (Chalmers)) ; Mattias Thuvander (Institutionen för fysik, Materialens mikrostruktur (Chalmers)) ; Krystyna Stiller (Institutionen för fysik, Materialens mikrostruktur (Chalmers))
Journal of Nuclear Materials (0022-3115). Vol. 482 (2016), p. 19-27.
[Artikel, refereegranskad vetenskaplig]

In order to simulate the environment experienced by spacer grids in a boiling water reactor (BWR), specimens of the Ni-based Alloy X-750 were exposed to a water jet in an autoclave at a temperature of 286 degrees C and a pressure of 80 bar. The oxide microstructure of specimens exposed for 2 h, 24 h, 168 h and 840 h has been investigated mainly using electron microscopy. The specimens suffer mass loss due to dissolution during exposure. At the same time a complex layered oxide develops. After the longest exposure the oxide consists of two outer spinel layers consisting of blocky crystals, one intermediate layer of nickel oxide interspersed with Ti-rich oxide needles, and an inner layer of oxidized base metal. The evolution of the oxide leading up to this structure is discussed and a model is presented.

Nyckelord: High temperature water, Alloy X-750, Corrosion, NiFe2O4, Oxide formation, BWR, Nickel based alloys



Denna post skapades 2016-12-09. Senast ändrad 2017-06-07.
CPL Pubid: 246013

 

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