Corrosion behavior of 316 stainless steel, copper, and brazed joint in lithium bromide solution at different temperatures
Author:
Zhang Xiang1, Qiu Yunlong2, Zhu Weifei2, Yu Xinhua2, Cao Yanan2, Wang Xiaohuan3, Liang Yanqin1
Affiliation:
1. Tianjin University , Tianjin , China 2. Zhongxing Energy Equipment Co. Ltd , Nantong , China 3. Inner Mongolia University of Technology , Hohhot , China
Abstract
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.
Publisher
Walter de Gruyter GmbH
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Reference25 articles.
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