| GU Tianzhen,LIU Yuwei,PENG Can,ZHANG Peng,WANG Zhenyao,WANG Chuan,SUN Li.Corrosion Behavior of Hot-dip Zn-Al-Mg Coating Exposed to a Simulated Hot and Humid Marine Atmosphere[J],53(2):110-119 |
| Corrosion Behavior of Hot-dip Zn-Al-Mg Coating Exposed to a Simulated Hot and Humid Marine Atmosphere |
| Received:November 22, 2022 Revised:February 03, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.02.010 |
| KeyWord:hot-dip Zn-Al-Mg coating hot and humid marine atmosphere atmospheric corrosion mass loss corrosion products structure |
| Author | Institution |
| GU Tianzhen |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China;School of Materials Science and Engineering, University of Science and Technology of China, Shenyang , China;Liaoning Shenyang Soil and Atmosphere Corrosion of Materials National Observation and Research Station, Shenyang , China |
| LIU Yuwei |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China;Liaoning Shenyang Soil and Atmosphere Corrosion of Materials National Observation and Research Station, Shenyang , China |
| PENG Can |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China;School of Materials Science and Engineering, University of Science and Technology of China, Shenyang , China;Liaoning Shenyang Soil and Atmosphere Corrosion of Materials National Observation and Research Station, Shenyang , China |
| ZHANG Peng |
HBIS Group Technology Research Institute, Shijiazhuang , China |
| WANG Zhenyao |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China;Liaoning Shenyang Soil and Atmosphere Corrosion of Materials National Observation and Research Station, Shenyang , China |
| WANG Chuan |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China;Liaoning Shenyang Soil and Atmosphere Corrosion of Materials National Observation and Research Station, Shenyang , China |
| SUN Li |
HBIS Group Technology Research Institute, Shijiazhuang , China |
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| Abstract: |
| 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. |
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