Abstract The electrochemical reduction behavior of molten Na2SO4 was investigated at 700 °C in LiCl-KCl-Na2SO4 (5–15 mol%) electrolyte under two different gaseous atmospheres of inert argon and oxidizing O2-0.1% SO2. Sulfate ions (SO42–) were directly reduced into sulfur (S) and sulfide (S2–) ions at large negative overpotentials in both gaseous atmospheres. During the transition from inert to oxidizing atmosphere, open circuit potentials of a platinum electrode (vs. Ag/Ag+) were shifted in the positive direction by more than 0.60 V, implying the presence of stronger oxidants which can be coupled with the metal oxidation reactions during the hot corrosion processes.

中文翻译：

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700 °C 时 LiCl-KCl-Na 2 SO 4 中熔融硫酸盐的电化学研究

摘要 在惰性氩气和氧化 O2-0.1% SO2 两种不同气体气氛下，研究了 LiCl-KCl-Na2SO4 (5-15 mol%) 电解质中熔融 Na2SO4 在 700 °C 下的电化学还原行为。在两种气体环境中，硫酸根离子 (SO42-) 都以大的负过电位直接还原为硫 (S) 和硫化物 (S2-) 离子。在从惰性气氛到氧化气氛的转变过程中，铂电极的开路电位（相对于 Ag/Ag+）正向移动超过 0.60 V，这意味着存在更强的氧化剂，可以与金属氧化反应耦合在热腐蚀过程中。