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<p>The study investigates the effect of adding equal mass ratios of Si-Ti, Si-Zr, and Ti-Zr elements on the microstructure, mechanical properties, and corrosion behavior of the Zn-5Al-3Mg alloy, respectively. Microstructural characterization reveals that the Si addition promotes the formation and growth of Al-rich dendrites. Conversely, the synergistic combination of Ti and Zr leads to significant grain refinement of the Al-rich phase. This refinement is accompanied by the formation of a core-shell structure, where MgZn<sub>2</sub> encapsulates Mg<sub>2</sub>Zn<sub>11</sub>, and the precipitation of a novel Al<sub>3</sub>(Ti, Zr) phase. Mechanical property demonstrates that all alloying additions enhance the Rockwell hardness, with the Zn-5Al-3Mg-0.2(Si-Ti) alloy achieving the peak value of 89.03 HRB. Electrochemical corrosion tests indicate that the Ti-Zr modified alloy has superior corrosion resistance. This is evidenced by its most positive corrosion potential and lowest corrosion current density. Post-corrosion surface analysis showed no macroscopic pitting for this alloy. This enhanced corrosion resistance is attributed to the refined microstructure, which facilitates the formation of a dense and highly protective corrosion product layer, predominantly composed of Zn<sub>5</sub>(CO<sub>3</sub>)<sub>2</sub>(OH)<sub>6</sub>. The findings confirm that the synergistic effect of Ti and Zr is the most effective in optimizing the overall performance of the Zn-5Al-3Mg alloy.</p>

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Improving the Microstructure, Hardness, and Corrosion Resistance of Zn-5Al-3Mg Alloys by 0.2 wt.% Binary Microalloying of Si, Ti, and Zr

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Mengmeng Zhang,
  • Huijie Sun,
  • Shui Yu,
  • Longyue Ma,
  • Jin Sun,
  • Guorong Zhou

摘要

The study investigates the effect of adding equal mass ratios of Si-Ti, Si-Zr, and Ti-Zr elements on the microstructure, mechanical properties, and corrosion behavior of the Zn-5Al-3Mg alloy, respectively. Microstructural characterization reveals that the Si addition promotes the formation and growth of Al-rich dendrites. Conversely, the synergistic combination of Ti and Zr leads to significant grain refinement of the Al-rich phase. This refinement is accompanied by the formation of a core-shell structure, where MgZn2 encapsulates Mg2Zn11, and the precipitation of a novel Al3(Ti, Zr) phase. Mechanical property demonstrates that all alloying additions enhance the Rockwell hardness, with the Zn-5Al-3Mg-0.2(Si-Ti) alloy achieving the peak value of 89.03 HRB. Electrochemical corrosion tests indicate that the Ti-Zr modified alloy has superior corrosion resistance. This is evidenced by its most positive corrosion potential and lowest corrosion current density. Post-corrosion surface analysis showed no macroscopic pitting for this alloy. This enhanced corrosion resistance is attributed to the refined microstructure, which facilitates the formation of a dense and highly protective corrosion product layer, predominantly composed of Zn5(CO3)2(OH)6. The findings confirm that the synergistic effect of Ti and Zr is the most effective in optimizing the overall performance of the Zn-5Al-3Mg alloy.