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<p>This study evaluates the corrosion behavior of an Al–25Fe–25Ni alloy in 0.5 M H<sub>2</sub>SO<sub>4</sub> at room temperature using electrochemical techniques. The alloy and its constituent elements (Al, Fe, Ni) were analyzed to identify their individual contributions to the passivation behavior. Potentiodynamic polarization revealed <i>E</i><sub>corr</sub> =  − 262 mV vs. SCE and <i>i</i><sub>corr</sub> = 0.0302&#xa0;mA/cm<sup>2</sup> for the alloy, values similar to those of Ni. Al showed the most negative <i>E</i><sub>corr</sub> (− 725 mV), while Fe exhibited an intermediate value (−499 mV) and the highest <i>i</i><sub>corr</sub> (0.2349&#xa0;mA/cm<sup>2</sup>). The alloy displayed two passivation regions: the first associated with Al and the second with Ni, with Fe playing a minor role. After 24 h, <i>R</i><sub><i>p</i></sub> values reached ~ 8500 Ω&#xa0;cm<sup>2</sup> for the alloy and Ni but remained &lt; 1000 Ω&#xa0;cm<sup>2</sup> for Al and Fe. The alloy’s enhanced resistance was attributed to Ni and the formation of protective Ni–Al oxides, confirmed by SEM, EDS, and XRD.</p> Graphical abstract <p></p>

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Study of the corrosion phenomenon of an Al–Fe–Ni alloy in an aqueous H2SO4 solution

  • 期刊论文

  • 发表日期：

    2025年12月19日

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  • K. Y. Medrano Zamudio,
  • G. Carbajal De la Torre,
  • M. L. Ballesteros Almanza,
  • Hongbo Liu,
  • M. A. Espinosa Medina

摘要

This study evaluates the corrosion behavior of an Al–25Fe–25Ni alloy in 0.5 M H2SO4 at room temperature using electrochemical techniques. The alloy and its constituent elements (Al, Fe, Ni) were analyzed to identify their individual contributions to the passivation behavior. Potentiodynamic polarization revealed Ecorr =  − 262 mV vs. SCE and icorr = 0.0302 mA/cm2 for the alloy, values similar to those of Ni. Al showed the most negative Ecorr (− 725 mV), while Fe exhibited an intermediate value (−499 mV) and the highest icorr (0.2349 mA/cm2). The alloy displayed two passivation regions: the first associated with Al and the second with Ni, with Fe playing a minor role. After 24 h, Rp values reached ~ 8500 Ω cm2 for the alloy and Ni but remained < 1000 Ω cm2 for Al and Fe. The alloy’s enhanced resistance was attributed to Ni and the formation of protective Ni–Al oxides, confirmed by SEM, EDS, and XRD.

Graphical abstract