Abstract
Zn-Al-Mg alloys with the alloying elements of Si, Ti and Zr by microalloying method were designed. The microstructure was well characterized, and the Rockwell hardness as well as anti-corrosion were tested. The results showed that the alloys with Si, Ti and Zr elements not only contain the same Al rich phase, Zn rich phase and lamellar Zn/Al/MgZn2 ternary eutectic structure as Zn–5Al–2Mg, but also the formation of Si rich phase, Ti(Al1 – xSix)3 phase, Al3Zr phase and Al3(Ti, Zr) phase, respectively. The electrochemical test demonstrated that Zn–5Al–2Mg–0.2(TiZr) alloy has higher corrosion resistance as compared to that with the addition of (Si,Ti) and (Si,Zr) elements. Therefore, the addition of Ti and Zr elements can greatly improve the corrosion resistance of Zn–5Al–2Mg alloy. Moreover, the corrosion products of Zn–5Al–2Mg alloy and Zn–5Al–2Mg–0.2(TiZr) alloy were tested by XPS. The results showed that the addition of Ti and Zr inhibits the formation of loose porous ZnO, while promotes the formation of compact Zn5(CO3)2(OH)6, Zn5(CO3)2(OH)6 can adhere to the sample surface well, hinder the charge transfer, and improve the corrosion resistance of the alloy.
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The financial support for this study is provided by The Natural Science Foundation of Shandong Province, China (no. ZR2021ME191).
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Chen, W., Sun, H., Zhou, G. et al. Effect of Alloying Elements on the Microstructure and Corrosion Resistance of Zn–5Al–2Mg Alloy. Prot Met Phys Chem Surf 59, 232–244 (2023). https://doi.org/10.1134/S2070205122060041
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DOI: https://doi.org/10.1134/S2070205122060041