低熔点混合熔融盐腐蚀性研究  

RESEARCH ON CORROSIVE PROPERTY OF LOW MOLTING POINT MIXED MOLTEN SALT

作　　者：鹿院卫 李勇 吴玉庭 马重芳 Lu Yuanwei, Li Yong, Wu Yuting, Ma Chongfang(Key Laboratory of Enhaneed Heat Transfer and Energy Conservation, Ministry of Education ＆ Key Laboratory of Enhaneed Heat Transfer and Energy Conservation, Beijing Municipality, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing University of Technology, Beijing 100124, Chin)

机构地区：[1]北京工业大学环境与能源工程学院传热强化与过程节能教育部重点实验室传热与能源利用北京市重点实验室

出　　处：《太阳能学报》2018年第3期692-696,共5页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51576006);国家重点基础研究发展(973)计划(2015CB251303)

摘　　要：该文作者所在课题组在SolarSalt的基础上成功研制出一种低熔点（85.4℃）、高分解温度（612℃）的四元混合熔融盐（Ca（NO3）2、KNO3、NaNO3、LiNO3的质量比为2：6：1：2）。但该熔融盐与金属材料的相容性未知，为弄清所研制四元混合硝酸盐与金属材料的相容性规律，采用失重法分别测量5种不同材料（不锈钢201、304、321、316L及碳钢）在不同温度混合硝酸盐中的腐蚀速率。结果发现，混合硝酸盐对不锈钢316L腐蚀性最小，300℃和600℃时腐蚀速率分别为0．003mm／a和0．20mm／a，而对碳钢的腐蚀性最大。在此基础上，基于x射线衍射谱图对试验件表面腐蚀成分进行分析，探讨熔盐腐蚀机理，为熔盐在太阳能热发电中的实际应用提供依据。A new mixed molten salt has been developed by our research team on the basis of Solar Salt, which was comprised of Ca（N03）2, KN03, NAN03 and LiNO3 with mass ration of 2： 6：1 ： 2. Its melting temperature is about 85.4 ℃ and the decomposition temperature is about 612 ℃. However, its metal compatibility has not been determined. In order to explore the metal compatibility of the quaternary mixture of nitrate, four different kinds of metal materials, stainless steel 316L, 304, 321 and carbon steel, were used as testing samples. The corrosion rates of four metal samples were studied by weight-loss method. The results show that the corrosion rate of stainless steel 316L is minimal, which is about 0.003 mm/year at 300 ℃ and 0.20 mm/year at 600 ℃. While the corrosion rates of the carbon steel is more than others. Based on the results, the the corrosion mechanism thermal power station of molten products of the specimens were analyzed by X ray diffraction spectrum to determine salt. The results will be a base for the practical application of molten salt in solar thermal power station.

关 键 词：低熔点 熔融盐 腐蚀速率 X射线衍射谱图 

分 类 号：TK519[动力工程及工程热物理—热能工程]