Corrosion Protection of Materials

Corrosion Resistance of Dysprosium Complex Oxide Compound Pellets in a Model Environment of VVER-1000 Primary Coolant

Ihor Chernov1, Valeriy Zuyok1, Ihor Kolodiy2, Olena Bereznyak2, Mykhaylo Tretyakov1, Roman Rud1, Mykola Pylypenko2

1. “Nuclear Fuel Cycle” Science and Technology Establishment of the National Science Center “Kharkiv Institute of Physics and Technology”, Ukraine
2. Institute of Solid State Physics, Materials Science and Technologies of the National Science Center “Kharkiv Institute of Physics and Technology, Ukraine

https://doi.org/10.15407/msse2025.01.134

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Keywords

hydration, thermodesorption, chemisorption, corrosion resistance

Abstract

Corrosion tests of dysprosium titanate and dysprosium hafnate pellets in the model coolant environment of a VVER-1000 reactor for 5,000 hours at a temperature of 350 °C and a pressure of 16.5 MPa revealed formation of the dysprosium borate (DyBO3), as well as small amounts of dysprosium hydroxides DyOOH and Dy(OH)3 in the surface layers of the pellets. The linear dimensions of the pellets did not change, and the pellets retained their integrity, indicating satisfactory corrosion resistance.

References

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  2. Chernov І. О., Zuyok V. А., Grytsyna V. М., Belash М. М., Kolodiy І. V. Corrosion resistance of dysprosium titanate powders and tablets in the model environment of the coolant of the WWER-1000. Physicochemical Mechanics of Materials. – – 59. № 1. – Р. 100–103. http://pcmm.ipm.lviv.ua/pcmm-2023-1u.pdf.