三元硝基碳酸高分解温度混合熔融盐动态腐蚀特性

doi:10.19799/j.cnki.2095-4239.2024.1057

储能科学与技术 ›› 2025, Vol. 14 ›› Issue (4): 1386-1393.doi: 10.19799/j.cnki.2095-4239.2024.1057

三元硝基碳酸高分解温度混合熔融盐动态腐蚀特性

韩昕龙¹^,²(), 鹿院卫¹^,²(), 马彦成¹^,², 吴玉庭¹^,², 张灿灿¹^,²

^1.北京工业大学传热与能源利用北京市重点实验室
^2.国家能源用户侧储能创新研发中心，北京 100124

收稿日期:2024-11-12 修回日期:2024-12-10 出版日期:2025-04-28 发布日期:2025-05-20
通讯作者: 鹿院卫 E-mail:hxl20000818@163.com;luyuanwei@bjut.edu.cn
作者简介:韩昕龙（2000—），男，硕士研究生，研究方向为熔盐腐蚀，E-mail：hxl20000818@163.com；
基金资助:
国家重点研发计划(2022YFB4202402);国家自然科学基金(52076006)

Research on the dynamic corrosion characteristics of ternary nitrocarbonate acid mixed molten salt at high decomposition temperatures

Xinlong HAN¹^,²(), Yuanwei LU¹^,²(), Yancheng MA¹^,², Yuting WU¹^,², Cancan ZHANG¹^,²

^1.Beijing Key Laboratory of Heat Transfer and Energy Conversion, Beijing University of Technology
^2.National User-Side Energy Storage Innovation Research and Development Center, Beijing 100124, China

Received:2024-11-12 Revised:2024-12-10 Online:2025-04-28 Published:2025-05-20
Contact: Yuanwei LU E-mail:hxl20000818@163.com;luyuanwei@bjut.edu.cn

摘要/Abstract

摘要：

熔融盐高温腐蚀对聚光太阳能热发电系统的长期安全运行至关重要。为了探究第三代太阳能热发电技术熔融盐与高温设备的相容性以及流速对熔融盐腐蚀性的影响，本工作选用高分解温度三元硝基碳酸混合熔融盐和347H不锈钢，搭建动态腐蚀实验台，采用失重法进行了347H不锈钢在640 ℃高温熔融盐环境下恒温1000 h的动态腐蚀实验，研究了在0.6 m/s和2 m/s两种流速下对不锈钢材料腐蚀的影响，并采用扫描电子显微镜(SEM)、X射线衍射(XRD)、能量色散X射线谱(EDS)测试方法对不锈钢腐蚀后的形貌及产物进行分析。结果表明，不同流速下的不锈钢均发生了氧化腐蚀现象。腐蚀失重值(m_mass)随流量的增加而增大。当腐蚀1000 h后，流速为0.6 m/s和2 m/s时，m_mass分别为17.8407 mg/cm²、24.6420 mg/cm²。同时也发现，在相同腐蚀时间内，随着流速的增大不锈钢表面形成的氧化层出现脱落现象，从而导致347H不锈钢的腐蚀速率也随之增加；而在相同的流速下，随着浸泡时间的增加347H不锈钢的腐蚀速率随之下降。

关键词: 太阳能, 熔融盐, 腐蚀失重值, 腐蚀速率, 不锈钢

Abstract:

High-temperature corrosion of molten salt is a critical factor affecting the long-term safe operation of concentrating solar power systems. To investigate the compatibility between molten salt used in the third-generation solar thermal power technology and high-temperature equipment, as well as the impact of flow rate on molten salt corrosion, this study examines the corrosion behavior of ternary nitrocarbonate mixed molten salt with a high decomposition temperature and 347H stainless steel. A dynamic corrosion test platform was established, and a 1000-hour dynamic corrosion test was conducted at 640 ℃ using the weight loss method. The corrosion behavior of 347H stainless steel was analyzed at two flow rates, 0.6 m/s and 2 m/s. The surface morphology and corrosion products were examined using scanning electron microscopy (SEM), X-ray diffraction, and energy-dispersive spectroscopy. The results indicate that oxidation corrosion occurs at both flow rates, with corrosion weight loss (m_mass) increasing as the flow rate increases. After 1000 h, the m_mass values were 17.8407 mg/cm² at 0.6 m/s and 24.6420 mg/cm² and 2 m/s. Additionally, the oxidation layer formed on the stainless steel surface deteriorates more rapidly at higher flow rates, leading to an increased corrosion rate of 347H stainless steel. However, the corrosion rate decreases at a constant flow rate as soaking time increases.

Key words: solar energy, molten salt, corrosion weight loss, dorrosion rate, stainless steel

中图分类号:

TK 514

韩昕龙, 鹿院卫, 马彦成, 吴玉庭, 张灿灿. 三元硝基碳酸高分解温度混合熔融盐动态腐蚀特性[J]. 储能科学与技术, 2025, 14(4): 1386-1393.

Xinlong HAN, Yuanwei LU, Yancheng MA, Yuting WU, Cancan ZHANG. Research on the dynamic corrosion characteristics of ternary nitrocarbonate acid mixed molten salt at high decomposition temperatures[J]. Energy Storage Science and Technology, 2025, 14(4): 1386-1393.

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三元硝基碳酸高分解温度混合熔融盐动态腐蚀特性

Research on the dynamic corrosion characteristics of ternary nitrocarbonate acid mixed molten salt at high decomposition temperatures

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