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Journal of Chinese Society for Corrosion and protection  2024, Vol. 44 Issue (4): 993-1000    DOI: 10.11902/1005.4537.2023.243
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Present Status and Progress of Corrosion Protection for Microchannel Heat Exchangers of Al-alloy
HE Jiaxuan1, ZHANG Yutong1, GUAN Xudong1, TANG Jianhua2, HUANG Hai2, ZHAO Xuhui1(), TANG Yuming1(), ZUO Yu1
1. Key Laboratory of Carbon Fiber and Functional Polymer, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China
2. Zhejiang Sanhua Intelligent Controls Co., Ltd., Hangzhou 310018, China
Cite this article: 

HE Jiaxuan, ZHANG Yutong, GUAN Xudong, TANG Jianhua, HUANG Hai, ZHAO Xuhui, TANG Yuming, ZUO Yu. Present Status and Progress of Corrosion Protection for Microchannel Heat Exchangers of Al-alloy. Journal of Chinese Society for Corrosion and protection, 2024, 44(4): 993-1000.

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Abstract  

Microchannel heat exchangers of Al-alloy are the important component for air conditioner, of which the primary material is 3003 Al-alloy. In practical applications, the Al-alloy is suffered from corrosion and then results in the heat exchanger failure. This paper firstly introduces the corrosion problems existing in microchannel heat exchangers, then reviews the corrosion causes and influencing factors, such as coolants, micro-galvanic corrosion of the alloy and air pollutants etc., and summarizes corrosion control methods such as inhibitors and surface treatments. Finally elaborates some surface treatment techniques developed for 3003 Al-alloy, including electroless plating, anodizing, chemical conversion, sol-gel treatment etc., which probably provide references for the development and production of corrosion-resistant microchannel heat exchangers of 3003 Al-alloy.

Key words:  microchannel heat exchangers      3003 Al-Alloy      corrosion resistance      surface treatment     
Received:  08 August 2023      32134.14.1005.4537.2023.243
ZTFLH:  TG178  
Corresponding Authors:  ZHAO Xuhui, E-mail: xhzhao@mail.buct.edu.cn;

URL: 

https://www.jcscp.org/EN/10.11902/1005.4537.2023.243     OR     https://www.jcscp.org/EN/Y2024/V44/I4/993

Fig.1  Structural diagram of microchannel heat exchanger
Fig.2  Photograph of fin corrosion of micro-channel heat exchanger after 1250 h of salt spray[13]
Fig.3  Schematic diagram of electrochemical actions between flat tube and fin
Fig.4  Intercrystalline corrosion of aluminum tube cross-section[24]
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