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| Effect of rare earth content on microstructure and corrosion resistance of hot-dip Zn–5Al alloy coated steel wire for bridge cables |
| Xiao-xiong Zhu1,2, Yi-fu Shen1, Cheng-tao Li1, Xiang Dai3, Guo-hao Xiao2 |
| 1 College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics (NUAA), Nanjing 211106, Jiangsu, China 2 Jiangsu Tokyo Rope Co., Ltd., Jiangyin 214425, Jiangsu, China 3 Nanjing Vocational University of Industry Technology, Nanjing 210023, Jiangsu, China |
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Abstract The effects of the content of rare earth elements on the microstructure and properties of hot-dip Zn–5Al alloy steel wire for bridge cables were investigated. The microstructure of the hot-dip coating was analyzed using an optical microscope and a scanning electron microscope equipped with an energy-dispersive spectrometer. The bonding force between the hot-dip coating and steel wire was determined by the winding test. The corrosion resistance of the steel wire hot-dip coating was tested by the electrochemical workstation. The hot-dip Zn–5Al alloy coating has a corrosion-resistant structure composed of a zinc-rich phase and an aluminum-rich phase. Due to the enhanced bonding force, the microstructure of the hot-dip coating of the Zn–5Al alloy with rare earth elements is more compact and uniform than that without rare earth elements. The addition of rare earth elements improves the corrosion resistance of Zn–5Al alloy coated steel wire. Due to the rare earth segregation, which prevents the corrosion of the grain boundary and enhances the anti-intergranular corrosion performance, steel wire exhibits the optimum corrosion resistance when the content of rare earth elements is 0.08 wt.%.
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Xiao-xiong Zhu,Yi-fu Shen,Cheng-tao Li, et al. Effect of rare earth content on microstructure and corrosion resistance of hot-dip Zn–5Al alloy coated steel wire for bridge cables[J]. Journal of Iron and Steel Research International, 2023, 30(10): 2101-2110.
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2023, Vol. 30 
