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<p>Nickel-based superalloys have been widely applied in aerospace, marine engineering, and other fields. This study investigated the corrosion behavior of pitting corrosion in nickel-based superalloys using scanning electron microscopy (SEM), fast Fourier transform (FFT) of electrochemical noise data, and Hilbert–Huang transform (HHT) methodologies. The results demonstrate that the current variance and standard deviation of nickel-based superalloys increase, the noise resistance decreases, and the slope (k-value) of the power spectral density curve exceeds − 20&#xa0;dB/decade, wavelet energy concentrates predominantly in D1-D3 scales, and numerous small, rapid characteristic peaks emerge in the high-frequency region of the Hilbert–Huang transform spectrum. These observations collectively indicate the initiation of surface pitting corrosion on the nickel-based superalloy following polarization. Microstructural morphology analysis further confirms the formation of pitting cavities on the alloy surface postpolarization. The electrochemical noise analysis method demonstrates robust efficacy in characterizing and evaluating pitting corrosion behavior in nickel-based superalloys.</p>

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Electrochemical Noise Analysis on Corrosion Behavior of Nickel-Based Superalloy

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Wang Jian,
  • Zou Yunhe,
  • Zhang Yuanhang,
  • Tan Yong,
  • Sun Jie

摘要

Nickel-based superalloys have been widely applied in aerospace, marine engineering, and other fields. This study investigated the corrosion behavior of pitting corrosion in nickel-based superalloys using scanning electron microscopy (SEM), fast Fourier transform (FFT) of electrochemical noise data, and Hilbert–Huang transform (HHT) methodologies. The results demonstrate that the current variance and standard deviation of nickel-based superalloys increase, the noise resistance decreases, and the slope (k-value) of the power spectral density curve exceeds − 20 dB/decade, wavelet energy concentrates predominantly in D1-D3 scales, and numerous small, rapid characteristic peaks emerge in the high-frequency region of the Hilbert–Huang transform spectrum. These observations collectively indicate the initiation of surface pitting corrosion on the nickel-based superalloy following polarization. Microstructural morphology analysis further confirms the formation of pitting cavities on the alloy surface postpolarization. The electrochemical noise analysis method demonstrates robust efficacy in characterizing and evaluating pitting corrosion behavior in nickel-based superalloys.