Corrosion behavior of 316 stainless steel, copper, and brazed joint in lithium bromide solution at different temperatures

Xiang Zhang; Yunlong Qiu; Weifei Zhu; Xinhua Yu; Yanan Cao; Xiaohuan Wang; Yanqin Liang

doi:10.1515/mt-2021-2048

Article

Corrosion behavior of 316 stainless steel, copper, and brazed joint in lithium bromide solution at different temperatures

Xiang Zhang
Xiang Zhang, born in 1995, has been studying in Tianjin University from 2018 to now.
, Yunlong Qiu
Yunlong Qiu works at Zhongxing Energy Equipment Co. Ltd.
, Weifei Zhu
Weifei Zhu works at Zhongxing Energy Equipment Co. Ltd.
, Xinhua Yu
Xinhua Yu works at Zhongxing Energy Equipment Co. Ltd.
, Yanan Cao
Yanan Cao works at Zhongxing Energy Equipment Co. Ltd.
, Xiaohuan Wang
Xiaohuan Wang is an assistant professor in Inner Mongolia University of Technology, Hohhot, China.
and Yanqin Liang
Yanqin Liang, born in 1984, is an associate professor in Tianjin University, Tianjin, China. Her research focuses on nonprecious metal catalysts and corrosion.

Published/Copyright: February 21, 2022

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From the journal Materials Testing Volume 64 Issue 1

Abstract

Lithium bromide (LiBr) corrosion on austenitic 316 stainless steel (AISI 316) and copper will largely determine the overall performance of refrigeration compression systems. In this work, the corrosion behavior of AISI 316, copper, and brazed joint was studied in LiBr solution at different temperatures by using the polarization curve and electrical impedance spectroscopy. The morphology and chemical composition of the samples before and after corrosion were characterized to elucidate the corrosion mechanism. The passivation film of AISI 316 stainless steel is more prone to breakdown as the temperature increases, and the corrosion resistance of copper and brazed joint also decreases with the increasing temperature. Zero-resistance ammeter technology was employed to analyze the effect of temperature on galvanic corrosion. The degree of galvanic corrosion increases with temperature for all galvanic pairs (AISI 316-Cu, AISI 316-brazed joint, and Cu-brazed joint). For AISI 316-Cu and AISI 316-brazed joint galvanic pairs, AISI 316 functions as the cathode, while copper or brazed joint serves as the anode. For the Cu-brazed joint pair, the brazed joint is preferred to be corroded at room temperature, whereas at 50 and 75 °C, copper corrosion occurs in priority.

Keywords: 316 stainless steel; brazed joint (metal); copper; corrosion behavior; galvanic current; LiBr

Corresponding author: Yanqin Liang, Tianjin University, Tianjin, China, E-mail: yqliang@tju.edu.cn

Yunlong Qiu, Zhongxing Energy Equipment Co. Ltd, Nantong, China, E-mail: nt_pipe@vip.163.com

Funding source: National Natural Science Foundation of China

Award Identifier / Grant number: 51771131

About the authors

Xiang Zhang

Xiang Zhang, born in 1995, has been studying in Tianjin University from 2018 to now.

Yunlong Qiu

Yunlong Qiu works at Zhongxing Energy Equipment Co. Ltd.

Weifei Zhu

Weifei Zhu works at Zhongxing Energy Equipment Co. Ltd.

Xinhua Yu

Xinhua Yu works at Zhongxing Energy Equipment Co. Ltd.

Yanan Cao

Yanan Cao works at Zhongxing Energy Equipment Co. Ltd.

Xiaohuan Wang

Xiaohuan Wang is an assistant professor in Inner Mongolia University of Technology, Hohhot, China.

Yanqin Liang

Yanqin Liang, born in 1984, is an associate professor in Tianjin University, Tianjin, China. Her research focuses on nonprecious metal catalysts and corrosion.

Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: The authors are grateful to the National Natural Science Foundation of China (Grant number 51771131).
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Published Online: 2022-02-21

Published in Print: 2022-01-27

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Articles in the same Issue

https://doi.org/10.1515/mt-2021-2048

Keywords for this article

316 stainless steel; brazed joint (metal); copper; corrosion behavior; galvanic current; LiBr