2/Mg2Zn11) and ternary eutectic (Zn/Al/Mg2Zn11). New phases of (Ce1?xLax)Zn11 and Al2Ti appear with the addition of RE and Ti elements. Electrochemical impedance spectroscopy indicates that the corrosion resistance of Zn-2.5Al-3Mg-0.1RE-0.2Ti alloy can be significantly improved compared to that of Zn-2.5Al-3Mg alloy. XPS analysis results show that the addition of RE element promotes the formation of Zn5(CO3)2(OH)6 and MgAl2O4 in the corrosion products, while the simultaneous addition of RE and Ti elements promotes the formation of corrosion products Zn5(CO3)2(OH)6, ZnAl2O4 and MgAl2O4, and inhibits the formation of loose porous ZnO. Zn5(CO3)2(OH)6, ZnAl2O4 and MgAl2O4 attach well to the surface of the sample, which provides a dense protective layer for the alloys, thus improving the corrosion resistance of Zn-2.5Al-3Mg alloy."/>

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Effect of Adding RE and Ti Elements on Microstructure and Corrosion Resistance of Zn-2.5Al-3Mg Alloy
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1.School of Materials Science and Engineering, University of Jinan, Jinan 250022, China;2.Shandong Quality Inspection and Testing Center of Construction Engineering Co., Ltd, Jinan 250031, China;3.Shandong Huankeyuan Environmental Engineering Co., Ltd, Jinan 250013, China

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Natural Science Foundation of Shandong Province (ZR2021ME191)

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    Abstract:

    The effect of addition of RE and Ti on the microstructure and corrosion resistance of Zn-2.5Al-3Mg alloy were investigated by XRD, SEM, TEM and XPS. Results reveal that the microstructure of the Zn-2.5Al-3Mg alloy is composed of Zn-rich phase, binary eutectic (Zn-MgZn2/Mg2Zn11) and ternary eutectic (Zn/Al/Mg2Zn11). New phases of (Ce1?xLax)Zn11 and Al2Ti appear with the addition of RE and Ti elements. Electrochemical impedance spectroscopy indicates that the corrosion resistance of Zn-2.5Al-3Mg-0.1RE-0.2Ti alloy can be significantly improved compared to that of Zn-2.5Al-3Mg alloy. XPS analysis results show that the addition of RE element promotes the formation of Zn5(CO3)2(OH)6 and MgAl2O4 in the corrosion products, while the simultaneous addition of RE and Ti elements promotes the formation of corrosion products Zn5(CO3)2(OH)6, ZnAl2O4 and MgAl2O4, and inhibits the formation of loose porous ZnO. Zn5(CO3)2(OH)6, ZnAl2O4 and MgAl2O4 attach well to the surface of the sample, which provides a dense protective layer for the alloys, thus improving the corrosion resistance of Zn-2.5Al-3Mg alloy.

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[Chen Wenxuan, Zhou Guorong, Wang Xuefeng, Ma Longyue, Zhao Degang, Li Yongsheng, Wang Dong, Qin Bilian. Effect of Adding RE and Ti Elements on Microstructure and Corrosion Resistance of Zn-2.5Al-3Mg Alloy[J]. Rare Metal Materials and Engineering,2023,52(8):2737~2745.]
DOI：10.12442/j. issn.1002-185X.20220941

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History
  • Received:December 03,2022
  • Revised:June 01,2023
  • Adopted:March 20,2023
  • Online: August 25,2023
  • Published: August 24,2023