Sacrificial effect of titanium powder on the corrosion by hydrogen fluoride in LiF-NaF-KF

•Mixed Ti powder into FLiNaK suppressing the HF corrosion of Stainless Steel 430.•Suppression working even by the Ti powder exposed to air.•Suppression working by the Ti powder with 12 μm of the average particle diameter or with 100 nm or less of particle diameters. Sacrificial corrosion protection,...

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Bibliographic Details
Published in:Fusion engineering and design 2018-11, Vol.136, p.394-397
Main Authors: Yamazaki, Gaku, Yagi, Juro, Tanaka, Teruya, Watanabe, Takashi, Sagara, Akio
Format: Article
Language:English
Subjects:
Corrosion
Corrosion effects
Corrosion prevention
Hydrogen
Hydrogen fluoride
Lithium fluoride
Molten salt blanket
Molten salts
Redox reactions
Sacrificial protection
Salt
Submerging
Titanium
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Summary:•Mixed Ti powder into FLiNaK suppressing the HF corrosion of Stainless Steel 430.•Suppression working even by the Ti powder exposed to air.•Suppression working by the Ti powder with 12 μm of the average particle diameter or with 100 nm or less of particle diameters. Sacrificial corrosion protection, a new use of Ti powder in molten salt blankets, is proposed. Redox reactions of mixed Ti powder into molten fluoride salts are predicted to suppress the TF corrosion of structural materials. Stainless Steel 430 (SS430) is immersed into FLiNaK containing HF at 823 K for 6 h. Before the immersion, the Ti powder either exposed to air or not exposed to air at all is mixed into FLiNaK. It has been found that either types of mixed Ti powder can suppress the HF corrosion of SS430.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2018.02.054