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<p>The corrosion behavior of 7075Al/Al<sub>2</sub>O<sub>3</sub>3D interpenetrating phase composites (IPCs), prepared by the pressureless infiltration method, was investigated in a neutral salt spray (NSS) environment and compared with that of 7075Al. The corrosion process and mechanism were examined using scanning electron microscopy (SEM), SKPFM, potentiodynamic polarization curves (PDP), and electrochemical impedance spectroscopy (EIS). In the initial stage of NSS exposure, Mg diffused into the interior of Al<sub>2</sub>O<sub>3</sub>3D as an active element, resulting in the formation of a "small anode, large cathode" structure between Al<sub>2</sub>O<sub>3</sub>3D and Cu elements segregated near the interface. This led to slightly inferior corrosion resistance for 7075Al/Al<sub>2</sub>O<sub>3</sub>3D IPCs compared to pure 7075Al. However, during later stages of NSS exposure, the limited presence of Mg elements within the Al<sub>2</sub>O<sub>3</sub>3D micropores, in conjunction with the cathodic region formed by Cu elements and the unique three-dimensional topological structure of Al<sub>2</sub>O<sub>3</sub>3D itself, collectively impeded the progression of corrosion reactions. As a result, under long-term NSS exposure conditions, 7075Al/Al<sub>2</sub>O<sub>3</sub>3D IPCs exhibited stronger corrosion resistance than pure 7075Al.</p>

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Corrosion Behavior of 7075Al/Al2O33D IPCs Fabricated by Pressureless Immersion Method Compared with 7075Al in NSS Environment

  • 期刊论文

  • 发表日期：

    2025年1月20日

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  • Feng-jun Jin,
  • Pian-pian Xu,
  • Yi-chao Li,
  • Yan-li Jiang,
  • Liang Yu

摘要

The corrosion behavior of 7075Al/Al2O33D interpenetrating phase composites (IPCs), prepared by the pressureless infiltration method, was investigated in a neutral salt spray (NSS) environment and compared with that of 7075Al. The corrosion process and mechanism were examined using scanning electron microscopy (SEM), SKPFM, potentiodynamic polarization curves (PDP), and electrochemical impedance spectroscopy (EIS). In the initial stage of NSS exposure, Mg diffused into the interior of Al2O33D as an active element, resulting in the formation of a "small anode, large cathode" structure between Al2O33D and Cu elements segregated near the interface. This led to slightly inferior corrosion resistance for 7075Al/Al2O33D IPCs compared to pure 7075Al. However, during later stages of NSS exposure, the limited presence of Mg elements within the Al2O33D micropores, in conjunction with the cathodic region formed by Cu elements and the unique three-dimensional topological structure of Al2O33D itself, collectively impeded the progression of corrosion reactions. As a result, under long-term NSS exposure conditions, 7075Al/Al2O33D IPCs exhibited stronger corrosion resistance than pure 7075Al.