腐蚀
材料科学
熔盐
差示扫描量热法
热稳定性
热重分析
奥氏体
热分析
冶金
奥氏体不锈钢
等温过程
拉曼光谱
热能储存
化学稳定性
化学工程
微观结构
热的
热力学
物理
工程类
光学
作者
Carolina Villada,Alejandra Toro,F.J. Bolívar
标识
DOI:10.1016/j.est.2021.103465
摘要
In the present work, the corrosion performance of stainless austenitic steel SS304 in contact with three different molten nitrate salts was studied under long-term isothermal conditions. The microstructure and corrosion products during 2000 h corrosion test were analyzed by SEM/EDX as well as XRD after immersion in Solar Salt (60 wt.% NaNO3 - 40 wt.% KNO3), Hitec (7 wt.% NaNO3 – 53 wt.% KNO3 – 40 wt.% NaNO2) and the quaternary salt 45 wt.% KNO3 - 34 wt.% NaNO2 - 15 wt.% LiNO3 - 6 wt.% NaNO3. Additionally, deeper analyzes with the current commercial salts were carried out in order to provide experimental data not only for the metal/salt interaction but also for the chemical interaction salt/atmosphere. The melting behavior and maximum thermal stability of Solar Salt and Hitec were analyzed by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The melting and degradation temperature are discussed as well as the thermal stability of both salts monitored by Raman microscopy, which is an appropriate technique that confirmed the equilibrium alteration by decreasing the nitrite ion content over time. This work allows us to understand not only the high-temperature corrosion behavior of a potential container material but the chemical changes and thermal stability in molten salt mixtures. The results providing here may help to improve the understanding of material compatibility as well as the optimization of the engineering design with molten salts for thermal energy storage technologies.
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