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FeCr_(2)O_(4)、MnCr_(2)O_(4)提高了Q345R在450℃熔盐中的耐腐蚀性,因熔盐中Ca^(2+)存在而产生的腐蚀产物CaFeO_(4)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。
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 FeCr_(2)O_(4) and MnCr_()2O_(4) corrosion products on the sample surface,which improves the corrosion resistance of molten salt.Meanwhile,the presence of Ca^(2+) in molten salt results in the CaFeO_(4) 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 lowtemperature mixed molten salt in different fields.
作者
万明忠
王金龙
陈永安
鹿院卫
吴玉庭
张灿灿
WAN Mingzhong;WANG Jinong;CHEN Yongan;LU Yuanwei;WU Yuting;ZHANG Cancan(China Energy Digital Technology Group Co.,Ltd.,Beijing 100044,China;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)
出处
《储能科学与技术》
CAS
CSCD
北大核心
2023年第10期3099-3107,共9页
Energy Storage Science and Technology
基金
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)。
关键词
低熔点
混合硝酸盐
腐蚀性
储罐
low melting point
mixed nitrate
corrosiveness
storage tank
