Plasma and Fusion Research
Volume 13, 3405079 (2018)
Regular Articles
- 1)
- SOKENDAI (The Graduate University for Advanced Studies), Toki 509-5292, Japan
- 2)
- National Institute for Fusion Science, Toki 509-5292, Japan
Abstract
Sacrificial anode methods are focused upon for suppression of the tritium fluoride corrosion of structural materials in molten salt blankets in fusion reactors. Stainless Steel 430 (SS430) is immersed into hydrogen fluoride (HF)-containing LiF-NaF-KF (FLiNaK) for 6 hours at 773 K with Ti. It has been found that (1) the presence of Ti suppresses the corrosion of SS430 by HF. Further, by the electrical connection between SS430 and Ti, (2) Ti can sufficiently lower the potential of SS430, (3) the weight loss of Ti increases, and (4) the grain boundary corrosion of SS430 by Cr dissolution is mitigated. The applicability of sacrificial anode methods to molten salt blankets has been established.
Keywords
corrosion protection, FLiNaK, titanium, hydrogen fluoride, sacrificial anode, electrochemistry
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