Experiment and Analysis of Compatibility between New Phase Change Mixed Molten Salt and 316L Stainless Steel

  • REN Chenxing ,
  • ZHENG Chenghang ,
  • GAO Xiang
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  • 1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
    2. Institute of Carbon Neutrality, Zhejiang University, Hangzhou 310027, China
    3. Baima Lake Laboratory, Zhejiang University, Hangzhou 310051, China

Online published: 2024-11-05

Supported by

The authors gratefully acknowledge the financial support by the “Pioneer” and “Leading Goose” R&D Program of Zhejiang Province (Grant No. 2023C03008) and the National Natural Science Foundation of China (Grant No. 42341208).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024

Abstract

Molten salt is considered as a promising heat storage and heat transfer medium due to its efficient thermophysical properties. In order to study the compatibility of five new mixed molten salts obtained with KNO3, NaNO3, K2CO3, Ca(NO3)2·4H2O, ZnCl2, NaF, Na2CO3, NaCl and MgO as materials and 316L stainless steel, corrosion weight loss, scanning electron microscopy, elemental analysis and XRD were used to analyze the compatibility of 316L stainless steel in the new mixed molten salt at different time and temperatures. The corrosion behavior under the conditions was studied and characterized. Their compatibility data was obtained, and the corrosion mechanism of 316L stainless steel in mixed molten salts was explored. The results show that the corrosion weight of 316L stainless steel increases, and the corrosion degree of grain, crystal crack depth and oxidation degree increase gradually with the increase of temperature and time. The corrosion of molten salt on alloy is mainly caused by the selective diffusion loss and corrosion of Cr, Fe and other elements, and is accompanied by the formation of different metal oxides. The formation of metal oxides can slow down metal corrosion and loss to a certain extent. The corrosion results under different working conditions show that 316L stainless steel has good compatibility with the new mixed molten salt, and has certain application value in the field of heat transfer and energy storage.

Cite this article

REN Chenxing , ZHENG Chenghang , GAO Xiang . Experiment and Analysis of Compatibility between New Phase Change Mixed Molten Salt and 316L Stainless Steel[J]. Journal of Thermal Science, 2024 , 33(6) : 2259 -2273 . DOI: 10.1007/s11630-024-2037-6

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