Plasma and Fusion Research

Volume 16, 1205015 (2021)

Rapid Communications

Novel Cleaning Methodologies for Specimens Tested in Liquid Metals
Susumu HATAKEYAMA, Naoko OONO1), Takashi NOZAWA2), Kan SAKAMOTO3), Yoshie TAMAI4) and Masatoshi KONDO4)
Tokyo Institute of Technology, Department of Mechanical Engineering, Ookayama, Meguro-ku, Tokyo 152-8550, Japan
1)
Hokkaido University, Sapporo, Hokkaido 060-0808, Japan
2)
National Institutes for Quantum and Radiological Science and Technology, Rokkasho, Aomori 039-3212, Japan
3)
Nippon Nuclear Fuel Development, 2163 Narita-cho, Oarai-machi, Higashi-ibaraki-gun, Ibaraki 311-1313, Japan
4)
Tokyo Institute of Technology, Institute of Innovative Research, Ookayama, Meguro-ku, Tokyo 152-8550, Japan
(Received 8 December 2020 / Accepted 26 December 2020 / Published 19 February 2021)

Abstract

Liquid metals are excellent coolants of fission and fusion reactors. However, the chemical compatibility of structural materials is important issue. The mass losses of the high-temperature materials such as FeCrAl-ODS, SiC, and refractory metals by corrosion in liquid metals are essential information to obtain their corrosion rates. The specimens must be cleaned to remove liquid metals solidified and adhered on the specimens after the corrosion tests, though the damage of the specimens in the cleaning procedure must be minimized. Cleaning methodologies appropriate for the specimens tested in liquid metals are urgently required for further compatibility study. The cleaning methodology with 0.1M sodium hydroxide (NaOH) solution was developed, in which Sn was selectively dissolved without any damage on the specimens of the high-temperature materials. The cleaning procedure to remove Pb, Bi, and these alloys (i.e., Pb-16Li and Pb-Bi) adhered on the specimens in the solution mixture of acetic acid, ethanol, and H2O2 were also studied.

Keywords

liquid metal, cleaning procedure, compatibility study, corrosion

DOI: 10.1585/pfr.16.1205015

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