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CORROSION OF 12X18H10T STEEL IN Ce-, Nd- AND U-CONTAINING MOLTEN LiCl-KCl EUTECTIC

Jun 27, 2017, 5:30 PM
1h 30m
Poster Area (Yekaterinburg)

Poster Area

Yekaterinburg

POSTER Track 4. Fuel Cycle: Sustainability, Environmental Considerations and Waste Management Issues Poster Session 1

Speaker

Dr Evgeniya Nikitina (Institute of High Temperature Electrochemistry)

Description

The present work is aimed at the study of the 12Х18Н10Т steel corrosion in the molten LiCl-KCl eutectic, which contains different proportions of CeCl3, NdCl3 and UCl3. The CeCl3 and NdCl3 concentrations varied within the interval of 0.2-5.0 mol.%, and the UCl3concentration varied within the interval of 1.0-2.5 mol.%. The temperature of the experiments was 500 0C. The composition of the melts under study was close to the composition of real electrolytes, which appear at the nitride SNF processing. The basic method of study is the gravimetric method with the exposure time from 24 to 100 hours. Atomic-adsorption, micro X-ray spectral and X-ray structural methods were used for samples analysis. The first component of selective dissolution in the steel under study was Fe. Chromium and manganese dissolution degrees were the smallest. The presence of UCl3 in the melt was found to have the largest impact on corrosion. The corrosion rate is rather small. For example, in the melt containing 1 mol.% of NdCl3 the corrosion is equal to 1.93 g/(m2∙h), and in the (LiCl-KCl)eut. + 1%CeCl3 +1%NdCl3 + 1%UCl3 melt it is 2.61 g/(m2∙h). The corrosion mechanism was found to be electrochemical.

Country/Int. Organization

Russia / Institute of High Temperature Electrochemistru

Primary author

Dr Evgeniya Nikitina (Institute of High Temperature Electrochemistry)

Co-authors

Prof. Alexei Potapov (Institute of High Temperature Electrochemistry) Mrs Natalja Kazakovtseva (Institute of High Temperature Electrochemistry) Dr Vladimir Shishkin (Institute of High Temperature Electrochemistry)

Presentation materials