Comparative investigation on dynamic hot corrosion behavior of 347H in quaternary molten salt and its nanofluids

IF 6.3 2区材料科学 Q2 ENERGY & FUELS Solar Energy Materials and Solar Cells Pub Date : 2024-11-14 DOI:10.1016/j.solmat.2024.113263

Ruotong Xu , Cancan Zhang , Lina Ma , Guoqiang Wang , Yuting Wu , Yuanwei Lu

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Abstract

Molten salt corrosion behavior plays an important role in the safe operation of molten salt thermal energy storage system. In this work, the dynamic corrosion behavior of 347H stainless steel are investigated in quaternary nitrate-nitrite molten salt (QNN-MS) and its nanofluids. The results show that obvious scouring gullies were observed on the surface of the 347H coupons in dynamic QNN-MS compared with the static condition. The mass loss (m_mass) of 347H after 1000h in QNN-MS with flow rates of 2 m/s, 1.3 m/s, and 0.6 m/s were 2.54 mg/cm², 2.32 mg/cm², and 2.07 mg/cm², respectively, which were about 88.15 %, 71.51 % and 53.33 % higher than that under static condition. After adding SiO₂ nanoparticles, the corrosiveness of QNN-MS to 347H metal was reduced. At flow rates of 2 m/s and 0 m/s, the m_mass of 347H after 1000 h of corrosion in QNN-MS based nanofluids decreased by 0.70 mg/cm² and 1.36 mg/cm² compared to that in QNN-MS, respectively. Meanwhile, the dynamic corrosion mechanism is comparatively discussed by SEM, XRD and EDS method. This work could provide basic corrosion data for the design and optimization of molten salt thermal energy storage system.

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347H 在季熔盐及其纳米流体中的动态热腐蚀行为对比研究

熔盐腐蚀行为对熔盐热储能系统的安全运行起着重要作用。本文研究了 347H 不锈钢在季硝酸盐-亚硝酸盐熔盐（QNN-MS）及其纳米流体中的动态腐蚀行为。结果表明，与静态相比，动态 QNN-MS 中 347H 试样表面出现了明显的冲刷沟壑。在流速为 2 m/s、1.3 m/s 和 0.6 m/s 的 QNN-MS 条件下，347H 在 1000 小时后的质量损失（mmass）分别为 2.54 mg/cm2、2.32 mg/cm2 和 2.07 mg/cm2，比静态条件下分别高出约 88.15 %、71.51 % 和 53.33 %。加入 SiO2 纳米粒子后，QNN-MS 对 347H 金属的腐蚀性降低。在流速为 2 m/s 和 0 m/s 时，347H 在 QNN-MS 纳米流体中腐蚀 1000 h 后的质量比在 QNN-MS 中分别减少了 0.70 mg/cm2 和 1.36 mg/cm2。同时，通过 SEM、XRD 和 EDS 方法对动态腐蚀机理进行了比较讨论。这项工作可为熔盐储热系统的设计和优化提供基础腐蚀数据。

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来源期刊

Solar Energy Materials and Solar Cells 工程技术-材料科学：综合

CiteScore

12.60

自引率

11.60%

发文量

513

审稿时长

47 days

期刊介绍： Solar Energy Materials & Solar Cells is intended as a vehicle for the dissemination of research results on materials science and technology related to photovoltaic, photothermal and photoelectrochemical solar energy conversion. Materials science is taken in the broadest possible sense and encompasses physics, chemistry, optics, materials fabrication and analysis for all types of materials.