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<p>This investigation examined the efficacy of Nb₂O₅-based coatings, deposited by&#xa0;using the reactive sputtering technique, on the corrosion and corrosion-fatigue behaviour of 2198-T8 aluminium alloy used as aircraft material. Global corrosion behaviour was accessed by Open Circuit Potential (OCP), Potentiodynamic Polarization curves (PPc) and Electrochemical Impedance Spectroscopy (EIS) techniques in 0.6&#xa0;mol L⁻<sup>1</sup> NaCl solution. Fatigue crack growth&#xa0;(FCG) tests were conducted under controlled loading conditions in both air and saline environments. Comprehensive structural and morphological characterisations were performed using advanced microscopy and spectroscopy techniques, including Atomic Force Microscopy (AFM), Scanning Electron Microscopy/Energy Dispersive X-ray Spectroscopy (SEM/EDX), Raman spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), and Electron Backscatter Diffraction (EBSD). The results unequivocally demonstrated the protective nature of the coating, significantly enhancing the alloy's durability as evidenced by corrosion and fatigue-corrosion tests. These findings underscore the substantial potential of Nb₂O₅ coatings in extending the service life of 2198-T8 aluminium alloy when subjected to aggressive environments, thereby providing invaluable data for aerospace engineering applications.</p> Graphical abstract <p></p>

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Investigating the impact of nanostructured Nb2O5-based coating on the corrosion and corrosion-fatigue resistance of 2198-T8 aluminium alloy

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月31日

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  • Uriel Darhê Oudinot Dias Rangel,
  • Murilo Oliveira Alves Ferreira,
  • Natália Bueno Leite Slade,
  • Rogério Valentim Gelamo,
  • Carlos Antônio Reis Pereira Baptista,
  • Haroldo Cavalcanti Pinto,
  • Igor Mota,
  • Guilherme Yuuki Koga,
  • Hugo Manuel Brito Águas,
  • Witor Wolf,
  • Jéferson Aparecido Moreto

摘要

This investigation examined the efficacy of Nb₂O₅-based coatings, deposited by using the reactive sputtering technique, on the corrosion and corrosion-fatigue behaviour of 2198-T8 aluminium alloy used as aircraft material. Global corrosion behaviour was accessed by Open Circuit Potential (OCP), Potentiodynamic Polarization curves (PPc) and Electrochemical Impedance Spectroscopy (EIS) techniques in 0.6 mol L⁻1 NaCl solution. Fatigue crack growth (FCG) tests were conducted under controlled loading conditions in both air and saline environments. Comprehensive structural and morphological characterisations were performed using advanced microscopy and spectroscopy techniques, including Atomic Force Microscopy (AFM), Scanning Electron Microscopy/Energy Dispersive X-ray Spectroscopy (SEM/EDX), Raman spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), and Electron Backscatter Diffraction (EBSD). The results unequivocally demonstrated the protective nature of the coating, significantly enhancing the alloy's durability as evidenced by corrosion and fatigue-corrosion tests. These findings underscore the substantial potential of Nb₂O₅ coatings in extending the service life of 2198-T8 aluminium alloy when subjected to aggressive environments, thereby providing invaluable data for aerospace engineering applications.

Graphical abstract