Study on High-temperature Corrosion Behavior of 304 Stainless Steel in Molten Sodium Polysulfide

被引：0
|
作者：
Yao Y. [1 ]
Ren Y. [1 ]
Peng Y. [1 ]
Chen J. [1 ]
Qiu W. [1 ]
Zhou L. [1 ]
机构：
[1] Department of Energy and Power Engineering, Changsha University of Science and Technology, Changsha
来源：
Cailiao Daobao/Materials Reports | 2023年 / 37卷 / 14期
基金：
中国国家自然科学基金;
关键词：
304 stainless steel; current collector; electrochemical impedance spectroscopy; high temperature corrosion; sodium-sulfur battery;
D O I：
10.11896/cldb.22010026
中图分类号：
学科分类号：
摘要：
The stainless steel current collector of sodium-sulfur batteries is prone to suffer high-temperature corrosion in molten sodium polysulfide,which affects the performance of the battery. In this work,the high-temperature corrosion behavior of 304 stainless steel molten sodium polysulfide molten salt at 350 ℃ was studied by electrochemical impedance spectroscopy (EIS). Combined with microstructure analysis,the high-temperature corrosion mechanism was investigated. Electrochemical impedance spectroscopy of 304 stainless steel corroded in the molten sodium polysulfide is composed of the capacitive arc in the high frequency zone and the straight line in the low frequency zone,which shows a typical diffusion controlled reaction. The charge transfer resistance is between 0. 918 Ω·cm2 and 2. 014 Ω·cm2,indicating that 304 stainless steel is apt to corrode in the molten sodium polysulfide. The corrosion scale is mainly composed of FeS2,FeNiS2 outer layer,and inner layer Cr2 S3 . During the corrosion process,the product film on the surface of the alloy undergoes growth,dissolution and shedding. © 2023 Cailiao Daobaoshe/ Materials Review. All rights reserved.
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