Molten salts have been widely studied as the most common heat storage medium for concentrated solar power (CSP) plants. However, most studies have focused on the corrosiveness of molten salts, while this study innovatively reveals the role of stainless steel in promoting the decomposition of molten salts and the mechanism by which the halogen ions accelerate this process. Considering commercial Solar Salt as an example, the thermal stability, composition, and thermophysical properties of Solar Salt adding Cl⁻, Br⁻, and I⁻ after contacting different stainless steel were analyzed. The results showed that Cr was the main reason for the decomposition of the molten salt, and Cl⁻, Br⁻, and I⁻, all accelerated the decomposition. Meanwhile, different halogen ions promoted the decomposition of molten salts through different mechanisms: oxide layer destruction and chain oxidation.

中文翻译：

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钢中 Cr 对熔融硝酸盐热分解的加速作用以及卤素对这种作用的促进作用

熔盐作为聚光太阳能 (CSP) 电厂最常见的储热介质已得到广泛研究。然而，大多数研究都集中在熔盐的腐蚀性上，而这项研究创新性地揭示了不锈钢对熔盐分解的促进作用以及卤素离子加速这一过程的机制。以商用日晒盐为例，分析了添加Cl ^-、Br ^-和I ^-的日晒盐与不同不锈钢接触后的热稳定性、组成和热物理性质。结果表明，Cr是熔盐分解的主要原因，Cl ^-、Br ^-和I ^-，都加速了分解。同时，不同的卤素离子通过不同的机制促进熔盐的分解：氧化层破坏和链式氧化。