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<p>This research examines the corrosion behavior of a stir-cast Al-5Zn-0.5Mg alloy and its TiO₂-reinforced composite (Al-5Zn-0.5Mg/5TiO₂) in 3.5 wt% NaCl solution. Their performance was compared against pure Al and a synthesized MgZn₂ intermetallic to understand the role of each constituent phase. The electrochemical properties were examined through different techniques. Furthermore, a long-term degradation was assessed via immersion tests. Microstructural characterization was performed using scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy and X-ray diffraction. The results revealed that TiO₂ reinforcement substantially enhanced corrosion resistance. The base alloy exhibited a high corrosion rate of 5.09 mpy, whereas the composite demonstrated a markedly reduced rate of 2.01 mpy with a 60% improvement. Electrochemically, the composite showed a positive shift in corrosion potential from − 1229 mV to -1121 mV vs. Ag/AgCl and a reduction in corrosion current density, from 10.42 µA/cm² to 4.16 µA/cm², compared to the base alloy. Additionally, the composite exhibited a more noble pitting potential, and a stable passive film with a reduced current density. The post-corrosion SEM analysis revealed a shift from localized pitting in the base alloy to uniform corrosion in the composite.</p> Graphical Abstract <p></p>

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Electrochemical Characteristics of TiO2 Reinforced Al-Zn-Mg Alloy for Marine Applications

  • 期刊论文

  • 发表日期：

    2026年7月23日

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  • Gamal Rashed,
  • Mosaad Sadawy,
  • Ahmed Abdelkareem,
  • Amr Kandil

摘要

This research examines the corrosion behavior of a stir-cast Al-5Zn-0.5Mg alloy and its TiO₂-reinforced composite (Al-5Zn-0.5Mg/5TiO₂) in 3.5 wt% NaCl solution. Their performance was compared against pure Al and a synthesized MgZn₂ intermetallic to understand the role of each constituent phase. The electrochemical properties were examined through different techniques. Furthermore, a long-term degradation was assessed via immersion tests. Microstructural characterization was performed using scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy and X-ray diffraction. The results revealed that TiO₂ reinforcement substantially enhanced corrosion resistance. The base alloy exhibited a high corrosion rate of 5.09 mpy, whereas the composite demonstrated a markedly reduced rate of 2.01 mpy with a 60% improvement. Electrochemically, the composite showed a positive shift in corrosion potential from − 1229 mV to -1121 mV vs. Ag/AgCl and a reduction in corrosion current density, from 10.42 µA/cm² to 4.16 µA/cm², compared to the base alloy. Additionally, the composite exhibited a more noble pitting potential, and a stable passive film with a reduced current density. The post-corrosion SEM analysis revealed a shift from localized pitting in the base alloy to uniform corrosion in the composite.

Graphical Abstract