Corrosion of pure Cr and pure W in molten FLiNaK at 773 K was investigated to deeply understand the effect of the alloying elements on the corrosion mechanisms of reduced activation ferritic/martensitic (RAFM) steels. The molten salt blanket environment was simulated by hydrogen fluoride gas bubbling. Electrochemical polarization and weight change measurements were conducted to estimate corrosion rates. The oxidation reaction rate of pure Cr was extremely high (instantly reached 2.9 × 10 mm/year). The corrosion rate of W was lower than that of the RAFM steel, JLF-1 steel, and pure Fe by one order of magnitude. W was nobler than Ni, which is known as a corrosion-resistant metal to the molten fluoride salts and hydrogen fluoride. The compatibility of W coating with the first wall structure of blankets was evaluated with the local tritium breeding ratio (TBR). When a Pb neutron multiplier was used, thin W coating almost did not affect the local TBR.

中文翻译：

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氟化氢溶液对熔融 FLiNaK 中纯 Cr 和 W 的腐蚀

研究了纯 Cr 和纯 W 在 773 K 熔融 FLiNaK 中的腐蚀，以深入了解合金元素对还原活化铁素体/马氏体 (RAFM) 钢腐蚀机制的影响。通过氟化氢气体鼓泡模拟熔盐层环境。进行电化学极化和重量变化测量以估计腐蚀速率。纯Cr的氧化反应速率极高（瞬间达到2.9×10mm/年）。W的腐蚀速率比RAFM钢、JLF-1钢和纯Fe低1个数量级。W比Ni贵重，Ni被认为是对熔融氟化物盐和氟化氢具有耐腐蚀性的金属。用局部氚增殖比（TBR）评估W涂层与毯第一壁结构的相容性。当使用Pb中子倍增器时，薄W涂层几乎不影响局部TBR。