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<p>This study investigates the effect of Te on the microstructure, mechanical properties, and electrochemical performance of stir casting Al-5Zn-2.5&#xa0;Mg-0.2Sn-xTe alloys (<i>x</i> = 0.105, 0.210, 0.315, and 0.406 wt.%). Optical microscopy, SEM/EDS, XRD, and XPS techniques were used to examine the microstructure evolution. The corrosion performance of the alloys was performed in a 3.5 wt.% NaCl solution using various electrochemical techniques. The results revealed an improvement in grain size by 18% (from 48.07 to 39.44&#xa0;µm) and an increase in hardness by increasing the Te/Sn ratio to 2. The electrochemical results showed that incorporating Te in Al-5Zn-2.5&#xa0;Mg-0.2Sn alloy enhanced the passive stability of the films and decreased their susceptibility to localized corrosion. Furthermore, the findings illustrated that when the Te/Sn ratio increased from 0.0 to 2.0, the corrosion potential declined from − 1.02 to − 1.20&#xa0;V (Ag/AgCl), and the corrosion current density dropped from 7.94 to 0.102&#xa0;μA/cm<sup>2</sup>. Electrochemical impedance tests indicated that an increasing Te/Sn ratio in the alloy increased the charge-transfer resistance and decreased the double-layer capacitance, suggesting that the corrosion resistance of the alloys improved.</p>

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Role of Te Additions in Modifying the Microstructure and Passive Stability of Al-5Zn-2.5 Mg-0.2Sn Alloy

  • 期刊论文

  • 发表日期：

    2026年6月25日

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  • M. M. Sadawy,
  • Saad M. Fayed,
  • Ahmed M. Hosny,
  • Dongxu Chen,
  • Shengli Li

摘要

This study investigates the effect of Te on the microstructure, mechanical properties, and electrochemical performance of stir casting Al-5Zn-2.5 Mg-0.2Sn-xTe alloys (x = 0.105, 0.210, 0.315, and 0.406 wt.%). Optical microscopy, SEM/EDS, XRD, and XPS techniques were used to examine the microstructure evolution. The corrosion performance of the alloys was performed in a 3.5 wt.% NaCl solution using various electrochemical techniques. The results revealed an improvement in grain size by 18% (from 48.07 to 39.44 µm) and an increase in hardness by increasing the Te/Sn ratio to 2. The electrochemical results showed that incorporating Te in Al-5Zn-2.5 Mg-0.2Sn alloy enhanced the passive stability of the films and decreased their susceptibility to localized corrosion. Furthermore, the findings illustrated that when the Te/Sn ratio increased from 0.0 to 2.0, the corrosion potential declined from − 1.02 to − 1.20 V (Ag/AgCl), and the corrosion current density dropped from 7.94 to 0.102 μA/cm2. Electrochemical impedance tests indicated that an increasing Te/Sn ratio in the alloy increased the charge-transfer resistance and decreased the double-layer capacitance, suggesting that the corrosion resistance of the alloys improved.