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1 2007

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Oxide growth mechanism of Ni-base alloys in PWR primary coolant conditions

Marchetti L., Perrin S., Raquet O., Bennour I., Pellegrino S., Vaubaillon S., Miro S., Chevalier S., Heintz O., Pijola M.

Advances in Materials Science

2007

Vol. 7, nr 2(12)

247-253

The thin passive film, formed on Ni-base alloys in Pressurized Water Reactor (PWR) primary coolant, plays a key role on different corrosion and degradation processes. In order to know how the oxide layer grows on the alloy, Iwo different kinds of experiments have been performed. The first one consisted in depositting of gold markers on the alloy surface, and corroding this sample in a corrosion loop and finally in characterizing the gold markers location in relation to the oxide layer by RBS analysis (Rutherford Backscattering Spectrometry). The second experiment consisted actually of Iwo different corrosion treatments: in an H2160 medium, then in a mixed H2 16 O /H2 18 O medium. After these two corrosion cycles, SIMS analyses gave the oxygen isotope distribution profiles. Consequently, the location of the 18 O peak in the layer allowed to locate where the formation of the oxide took place. These experiments enabled us to have a better understanding about the growth mechanism of protective oxide formed on Ni-base alloy in PWR primary conditions. The diffusion of oxygen promotes the protective oxide growth at the alloy / oxide interface. The major part of this diffusion takes place along oxide grain boundaries.