Corrosion behaviour of the 347H stainless steel in molten NaCl-KCl-AlCl3 salts containing aluminum at 500 °C

IF 6.3 2区材料科学 Q2 ENERGY & FUELS

Solar Energy Materials and Solar Cells Pub Date : 2025-05-26 DOI:10.1016/j.solmat.2025.113715

Fangyuan Guo , Yimin Xu , Jia Li , Hao Gu , Zhongfeng Tang , Liuping Chen

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引用次数: 0

Abstract

The strong corrosiveness of the molten NaCl-KCl-AlCl₃ (NKA) salt limits its application as a heat transfer and storage fluid for the next-generation concentrated solar power. In this job, the molten NKA salt was purified with Al sheet, with an excessive amount of Al dissolved in the molten NKA salts. The compatibility of the 347H stainless steel in NKA salts containing aluminum was investigated at 500 °C using static corrosion method. The two-step weight loss of the corroded 347H stainless steel was observed, and the corrosion rate was 116.7 μm/a. The specimens were corroded uniformly. During the first 336 h, 347H stainless steel had a heavy weight loss because of the oxidation and dissolution of Fe and Cr from the 347H stainless steel. After 336 h, the 347H stainless steel's corrosion rate declined as a thick corrosion product layer formed on the surface. This result enriches the molten salt corrosion database and provides a reference for the application of NKA salts as the heat transfer fluid and thermal energy storage media.

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347H不锈钢在500℃含铝NaCl-KCl-AlCl3熔盐中的腐蚀行为

熔融NaCl-KCl-AlCl3 （NKA）盐的强腐蚀性限制了其作为下一代聚光太阳能的传热和存储流体的应用。在此工作中，用Al片对熔融NKA盐进行了净化，在熔融NKA盐中溶解了过量的Al。采用静态腐蚀法在500℃条件下研究了347H不锈钢在含铝NKA盐中的相容性。腐蚀后的347H不锈钢出现两步失重，腐蚀速率为116.7 μm/a。试样腐蚀均匀。在前336小时，由于347H不锈钢中的Fe和Cr的氧化和溶解，347H不锈钢的重量损失很大。336 h后，347H不锈钢的腐蚀速率下降，表面形成较厚的腐蚀产物层。该结果丰富了熔盐腐蚀数据库，为NKA盐作为传热流体和储热介质的应用提供了参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.