Electrochemical measurements of the corrosion of pure Fe and JLF-1 steel in HF-containing molten FLiNaK salt
Electrochemical measurements of the corrosion of pure Fe and JLF-1 steel in HF-containing molten FLiNaK salt
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DOI：
10.1016/j.fusengdes.2020.112134
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发表时间：
2021
影响因子：
1.7
通讯作者：
Gaku Yamazaki;T. Nagasaka;J. Yagi;T. Goto;Teruya Tanaka;Takashi Watanabe;A. Sagara
中科院分区：
文献类型：
--
作者：
Gaku Yamazaki;T. Nagasaka;J. Yagi;T. Goto;Teruya Tanaka;Takashi Watanabe;A. Sagara
为了建立含锂熔盐液膜，采用电位阶跃法研究了纯铁和JLF-1钢在FLiNaK（LiF-NaF-KF= 46.5-11.5-42.0）中的腐蚀速率和机理。模拟包层中的TF增殖，在773 K下向FLiNaK注入HF气体。HF气体分压（pHF）在8.59 ~ 2.46× 103 Pa之间变化。在电化学池中测定了纯铁和JLF-1钢的电流-电位曲线，并在极限电流密度下用Butler-Volmer方程进行拟合。纯铁的腐蚀电流密度（i cor）在i cor = 0.6pHF时随pHF的增加而增加。纯铁和JLF-1钢的腐蚀速率相近。为了保持JLF-1钢在包层中的均匀腐蚀速率低于0.1 mm/年，要求FLiNaK中的HF浓度低于1.2× 10− 4 molHF/m3。阴极电流密度（iLc）与pHF成正比，iLc =-0.11pHF，因此，HF腐蚀纯铁的速率限制过程是HF或H+在FLiNaK中的扩散。
In order to establish a liquid blanket using a Li-containing molten fluoride salt, the corrosion rate and mechanism of pure Fe and JLF-1 steel in FLiNaK (LiF-NaF-KF= 46.5-11.5-42.0) was investigated by one of the electrochemical methods, the potential step method. Simulating the TF breeding in the blanket, HF gas was injected into FLiNaK at 773 K. The partial pressure of HF gas (p HF) was varied from 8.59 to 2.46× 10 3 Pa. The current-potential curves of pure Fe and JLF-1 steel were measured in an electrochemical cell and fit by the Butler-Volmer equation with limited current density. The corrosion current density (i cor) of pure Fe increased with p HF as i c o r= 0.6 p H F. The corrosion rates of pure Fe and JLF-1 steel were close. In order to keep the uniform corrosion rate of JLF-1 steel below 0.1 mm/year in the blanket, HF concentration in FLiNaK is required less than 1.2× 10− 4 molHF/m 3. The cathodic current density (i Lc) was proportional to p HF as i L c=-0.11 p H F, and, therefore, the rate-limiting process of HF corrosion of pure Fe is predicted to be HF or H+ diffusion in FLiNaK.