低温混合硝酸盐与储罐材料Q345R相容性研究

doi:10.19799/j.cnki.2095-4239.2023.0443

储能科学与技术 ›› 2023, Vol. 12 ›› Issue (10): 3099-3107.doi: 10.19799/j.cnki.2095-4239.2023.0443

低温混合硝酸盐与储罐材料Q345R相容性研究

万明忠¹(), 王金龙², 陈永安¹, 鹿院卫²(), 吴玉庭², 张灿灿²

^1.中能建数字科技集团有限公司，北京 100044
^2.北京工业大学传热强化与过程节能教育部重点实验室暨传热与能源利用北京市重点实验室，北京 100124

收稿日期:2023-06-24 修回日期:2023-08-10 出版日期:2023-10-05 发布日期:2023-10-09
通讯作者: 鹿院卫 E-mail:mzwan2732@ceec.net.cn;luyuanwei@bjut.edu.cn
作者简介:万明忠(1964—)，男，正高级工程师，长期从事压缩空气储能技术研究，E-mail：mzwan2732@ceec.net.cn；
基金资助:
国家重点研发计划(2022YFB4202402);国家自然科学基金(52076006);企业委托项目(CEECSK-2022-KJ01)

Compatibility of low-temperature mixed nitrate and Q345R storage tank material

Mingzhong WAN¹(), Jinlong WANG², Yongan CHEN¹, Yuanwei LU²(), Yuting WU², Cancan ZHANG²

^1.China Energy Digital Technology Group Co. , Ltd. , Beijing 100044, China
^2.Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Ministry of Education and Key Laboratory of Heat Transfer and Energy Conversion of Beijing, Beijing University of Technology, Beijing 100124, China

Received:2023-06-24 Revised:2023-08-10 Online:2023-10-05 Published:2023-10-09
Contact: Yuanwei LU E-mail:mzwan2732@ceec.net.cn;luyuanwei@bjut.edu.cn

摘要/Abstract

摘要：

为了分析使用温度低的混合硝酸盐储热材料与储罐材料Q345R的相容性，本文采用恒温静态腐蚀法将低合金钢Q345R置于450 ℃的混合熔盐中进行腐蚀性研究，利用失重法分析了金属试样在熔盐中的腐蚀失重量及腐蚀速率。通过1000 h腐蚀性测试，获得了Q345R在低温混合硝酸盐中的腐蚀动力学曲线；利用扫描电子显微镜(SEM)、X射线衍射仪(XRD)和能谱分析仪(EDS)对金属试样在熔盐中的腐蚀行为进行表征。结果表明，Q345R在低温混合熔盐中的腐蚀失重量随腐蚀时间的延长较好地符合抛物线腐蚀规律，与相同工况下的太阳盐相比具有更低的腐蚀性，金属表面腐蚀氧化产物的结构和组成对Q345R在熔盐中的耐腐蚀性产生直接影响。因试样中Cr和Ni元素存在而产生的致密性腐蚀产物FeCr₂O₄、MnCr₂O₄提高了Q345R在450 ℃熔盐中的耐腐蚀性，因熔盐中Ca²⁺存在而产生的腐蚀产物CaFeO₄具有抑制腐蚀的作用，使得低温混合熔盐对Q345R的腐蚀性小于太阳盐。研究结果为低温混合熔盐作为储罐材料实际应用提供了选择依据。

关键词: 低熔点, 混合硝酸盐, 腐蚀性, 储罐

Abstract:

To analyze the compatibility of low-temperature molten salt and the Q345R storage tank material for heat storage, this study uses the constant-temperature static corrosion method to investigate the corrosion properties of low-alloy steel Q345R in the low-melting point mixed molten salt at 450 ℃ The corrosion mass loss of the sample is measured, and the corrosion rate is calculated with the mixed molten salt. The corrosion kinetics curve of the Q345R material in molten salt is obtained from the 1000 h corrosion test. The corrosion behavior characterization of the Q345R samples in molten salt is measured through scanning electron microscopy, X-ray diffraction, and energy-dispersive spectroscopy. The results show that the corrosion weight loss of the Q345R material in mixed molten salt effectively follows the parabolic corrosion law with the corrosion time increase. Its annual corrosion rate is lower than that in solar salt under the same working temperature conditions. The structure and the composition of the corrosion oxidation products affect the corrosion properties of the Q345R material. The presence of the Cr and Ni elements in the Q345R sample leads to the production of the dense FeCr₂O₄ and MnCr₂O₄ corrosion products on the sample surface, which improves the corrosion resistance of molten salt. Meanwhile, the presence of Ca²⁺ in molten salt results in the CaFeO₄ corrosion product, which has an inhibitory effect on the corrosion. That is, the corrosiveness of low-temperature mixed molten salt to the Q345R material is lower. This work provides a basis for selecting storage tank materials for the practical application of low-temperature mixed molten salt in different fields.

Key words: low melting point, mixed nitrate, corrosiveness, storage tank

中图分类号:

万明忠, 王金龙, 陈永安, 鹿院卫, 吴玉庭, 张灿灿. 低温混合硝酸盐与储罐材料Q345R相容性研究[J]. 储能科学与技术, 2023, 12(10): 3099-3107.

Mingzhong WAN, Jinlong WANG, Yongan CHEN, Yuanwei LU, Yuting WU, Cancan ZHANG. Compatibility of low-temperature mixed nitrate and Q345R storage tank material[J]. Energy Storage Science and Technology, 2023, 12(10): 3099-3107.

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低温混合硝酸盐与储罐材料Q345R相容性研究

Compatibility of low-temperature mixed nitrate and Q345R storage tank material

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