Corrosion Behavior of Hot-dip Zn-Al-Mg Coating Exposed to a Simulated Hot and Humid Marine Atmosphere

被引：0
|
作者：
Gu T. [1 ,2 ,3 ]
Liu Y. [1 ,3 ]
Peng C. [1 ,2 ,3 ]
Zhang P. [4 ]
Wang Z. [1 ,3 ]
Wang C. [1 ,3 ]
Sun L. [4 ]
机构：
[1] Institute of Metal Research, Chinese Academy of Sciences, Shenyang
[2] School of Materials Science and Engineering, University of Science and Technology of China, Shenyang
[3] Liaoning Shenyang Soil and Atmosphere Corrosion of Materials National Observation and Research Station, Shenyang
[4] HBIS Group Technology Research Institute, Shijiazhuang
来源：
Surface Technology | 2024年 / 53卷 / 02期
关键词：
atmospheric corrosion; corrosion products structure; hot and humid marine atmosphere; hot-dip Zn-Al-Mg coating; mass loss;
D O I：
10.16490/j.cnki.issn.1001-3660.2024.02.010
中图分类号：
学科分类号：
摘要：
The work aims to explore the corrosion behavior and mechanism of hot-dip Zn-Al-Mg coatings in a hot and humid marine atmosphere and provide data references for hot-dip Zn-Al-Mg coatings serving in the hot and humid marine atmosphere. The corrosion behavior of the hot-dip Zn-Al-Mg coating in a simulated hot and humid marine atmosphere was analyzed by corrosion weight loss, X-ray diffraction (XRD), scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS) and other test methods. The results showed that the corrosion product was mainly composed of Zn5(OH)8Cl2·H2O. After a period of corrosion, a small amount of ZnO and Zn5(OH)6CO3 were found. The corrosion product evolution was related to the participation of Mg in the corrosion process. The corrosion product had a lamellar structure, which was like a "sandwich" at 1 848 h. Compared with the upper and lower layers of dark substances, the bright-colored corrosion product in the middle layer had more Cl elements concentration. The corrosion rate of the hot-dip Zn-Al-Mg coating generally increased with time, and only dropped sharply in the stage of 672-840 h. Comparison of galvanized coatings corrosion in a simulated hot and humid marine environment and zinc corrosion in a hot and humid outdoor marine atmospheric environment showed that the hot-dip Zn-Al-Mg coating had high corrosion resistance in the simulated hot and humid marine atmosphere environment. The evolution of corrosion products of the hot dip Zn-Al-Mg coating in a simulated hot and humid Marine atmosphere is related to Mg in the corrosion process. The reason for the decrease of corrosion rate at 672-840 h is related to the decrease of ZnO and the increase of Zn5(OH)8Cl2·H2O in corrosion products. It is predicted that the hot-dip Zn-Al-Mg coating still has high corrosion resistance in the hot and humid harsh marine atmosphere, and it can be given priority as a construction material for hot and humid marine atmosphere environment. © 2024 Chongqing Wujiu Periodicals Press. All rights reserved.
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页码：110 / 119
页数：9
相关论文
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