Abstract
The effect of Nd microalloying on the microstructure and corrosion behavior of extruded Mg-6Al-3Sn-2Zn (ATZ632) alloys was investigated. The addition of Nd (0.45 wt.%) into the ATZ632 alloy resulted in the formation of a NdZn1.66Al2.34 phase with a relatively low Volta potential of 68 ~ 78 mV. The polarization resistance of this alloy was calculated to be 564.33 ohm cm2, which is approximately 7.7 times slower than that of the ATZ632 alloy. The main factors for improving the corrosion resistance of the extruded ATZ632 alloy with 0.45 wt.% Nd addition are: (1) the Nd2O3 prevention of Cl− from passing through the corrosion film; (2) the formation of denser and more uniform corrosion films; and (3) the grain refinement and wakening of the (0001) base-plane texture.
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Acknowledgments
The authors gratefully acknowledge the financial supports of the National Natural Science Foundation of China (Grant No. U2241231) and the Shandong Provincial Natural Science Foundation (Project No. ZR2023ME159).
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BJL: Methodology, conceptualization, investigation, writing—original draft, funding acquisition. FHG: Investigation. JJL: Methodology, resources, formal analysis, supervision, writing—review and editing. JP: supervision, review and editing.
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Lv, BJ., Gao, FH., Lv, JJ. et al. Effect of 0.45 wt.% Nd Addition on the Corrosion Resistance of Extruded Mg-6Al-3Sn-2Zn Alloy. J. of Materi Eng and Perform (2023). https://doi.org/10.1007/s11665-023-08526-9
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DOI: https://doi.org/10.1007/s11665-023-08526-9