Stainless steel 316 was examined for compatibility with the eutectic mixtures of NaCl + Na2CO3 and NaCl + Na2SO4 at 700 °C and Li2CO3 + K2CO3 + Na2CO3 at 450 °C in air for thermal energy storage. Electrochemical measurements combined with advanced microscopy and microanalysis techniques were employed. NaCl + Na2CO3 was found as the most aggressive salt at 700 °C. The attack morphology on the surface was uniform corrosion with no localized degradation at 450 °C. Microscopy observations showed grain boundary oxidative attack as the primary corrosion mechanism at 700 °C with depletion of alloying elements from grain boundaries.

中文翻译：

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316不锈钢在用于热能储存的共晶熔盐中的腐蚀

检查了不锈钢 316 与 NaCl + Na2CO3 和 NaCl + Na2SO4 的共晶混合物在 700 °C 和 Li2CO3 + K2CO3 + Na2CO3 的共晶混合物在 450 °C 的空气中的相容性，用于热能存储。电化学测量结合了先进的显微镜和微量分析技术。发现 NaCl + Na2CO3 是 700 °C 时最具腐蚀性的盐。表面的侵蚀形态是均匀腐蚀，在 450°C 下没有局部降解。显微镜观察表明，晶界氧化侵蚀是 700 °C 下的主要腐蚀机制，合金元素从晶界耗尽。