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

网络出版日期: 2024-11-05

基金资助

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).

版权

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

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

  • REN Chenxing ,
  • ZHENG Chenghang ,
  • GAO Xiang
Expand
  • 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

摘要

熔盐由于其高效的热物理性质而被认为是一种很有前途的储热换热介质。为了研究以KNO3、NaNO3、K2CO3、Ca(NO3) 2·4H2O、ZnCl2、NaF、Na2CO3、NaCl和MgO为材料制备的5种新型混合熔盐与316L不锈钢的相容性,采用腐蚀失重、扫描电镜、元素分析和XRD分析了316L不锈钢在不同时间和温度下与新型混合熔盐的相容性。研究并表征了这些条件下的腐蚀行为,获得了它们的相容性数据,探讨了316L不锈钢在混合熔盐中的腐蚀机理。结果表明:随着温度和时间的升高,316L不锈钢的腐蚀质量逐渐增大,晶粒腐蚀程度、晶裂深度和氧化程度逐渐增大;熔盐对合金的腐蚀主要是由Cr、Fe等元素的选择性扩散损失和腐蚀引起的,并伴有不同金属氧化物的形成。金属氧化物的形成可以在一定程度上减缓金属的腐蚀和损失。不同工况下的腐蚀结果表明,316L不锈钢与新型混合熔盐具有良好的相容性,在传热和储能领域具有一定的应用价值。

本文引用格式

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

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.

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