Dissolved valence state of iron fluorides and their effect on Ni-based alloy in FLiNaK salt,Corrosion Science

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Dissolved valence state of iron fluorides and their effect on Ni-based alloy in FLiNaK salt
Corrosion Science ( IF 7.4 ) Pub Date : 2021-09-06 , DOI: 10.1016/j.corsci.2021.109794
Hua Ai _{1,

2,

3} , Yiyang Liu _{1,

4} , Miao Shen _{1,

2,

3} , Huajian Liu _{1,

3,

4} , Yanjun Chen _{1,

2,

3} , Xinmei Yang _{1,

2,

3} , Hongtao Liu _{1,

2,

3} , Yuan Qian _{1,

2,

3} , Jianqiang Wang _{1,

2,

3}

Affiliation

In this study, the stable dissolved valence state of iron fluorides in molten LiF - NaF - KF (FLiNaK) salt and their effect on GH3535 alloy were systematically investigated. Results of in situ ultraviolet–visible (UV–Vis) absorption spectroscopy and electrochemical analysis indicated that Fe (II) in molten FLiNaK salt is unstable and gets converted to more stable Fe (III) through the disproportionation reaction: 3 Fe (II) = 2 Fe (III) + Fe. Thus, the corrosion of GH3535 alloy is aggravated by the addition of iron fluorides due to the redox reaction: Fe (III) + Cr = Fe + Cr (III), resulting in the formation of the Cr-depletion layer and Fe-rich layer.

中文翻译：

FLiNaK盐中氟化铁的溶解价态及其对镍基合金的影响

在这项研究中，系统研究了熔融 LiF-NaF-KF (FLiNaK) 盐中氟化铁的稳定溶解价态及其对 GH3535 合金的影响。原位紫外-可见 (UV-Vis) 吸收光谱和电化学分析结果表明，熔融 FLiNaK 盐中的 Fe (II) 不稳定，并通过歧化反应转化为更稳定的 Fe (III)：3 Fe (II) = 2 Fe (III) + Fe。因此，GH3535合金的腐蚀因氧化还原反应而加入氟化铁加剧：Fe(III)+Cr=Fe+Cr(III)，导致形成贫Cr层和富Fe层.

更新日期：2021-09-14

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