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<p>Nickel-based superalloys have found extensive application in aerospace and harsh environments because of their exceptional corrosion resistance. This investigation explored the corrosion resistance of a newly developed Ni-based superalloy, Haynes<sup>®</sup> 233 alloy produced by wire arc additive manufacturing (WAAM). Three distinctive WAAM samples were evaluated in as-built (AB), hot isostatic pressed (HIP), and heat-treated (HH) conditions, alongside a mill annealed wrought (WR) in 3.5 wt% NaCl solution. The samples were characterized using potentiodynamic polarization analysis, electrochemical impedance spectroscopy (EIS), surface morphology assessment via scanning electron microscopy (SEM), and X-ray diffraction (XRD). Findings indicated that the WR sample exhibited the highest corrosion resistance (E<sub>corr</sub>=-126 mV) among all samples, showing the highest corrosion potential value. This was followed by the HIPed and HH samples (E<sub>corr</sub>=-288 mV), with the AB sample (E<sub>corr</sub>=-296 mV) showing the least resistance to corrosion. The findings were additionally corroborated through EIS results revealing the formation of oxide film on the alloy surface. The results from EDS indicated the presence of Ni, Cr, Al, Ti, O, and Mo on the surface of the alloy after corrosion. This was further corroborated by the XRD results, which confirmed the peaks corresponding to the oxides of Cr, Ni, Ti, and Al.</p>

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Corrosion Behavior of Haynes® 233 Manufactured by Wire Arc Additive Manufacturing in 3.5 wt%. NaCl

  • 期刊论文

  • 发表日期：

    2025年12月3日

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  • Peter Omoniyi,
  • Samuel Onimpa Alfred,
  • Kenneth Looby,
  • Olu Bamiduro,
  • Akindele Odeshi,
  • Mehdi Amiri,
  • Gbadebo Owolabi

摘要

Nickel-based superalloys have found extensive application in aerospace and harsh environments because of their exceptional corrosion resistance. This investigation explored the corrosion resistance of a newly developed Ni-based superalloy, Haynes® 233 alloy produced by wire arc additive manufacturing (WAAM). Three distinctive WAAM samples were evaluated in as-built (AB), hot isostatic pressed (HIP), and heat-treated (HH) conditions, alongside a mill annealed wrought (WR) in 3.5 wt% NaCl solution. The samples were characterized using potentiodynamic polarization analysis, electrochemical impedance spectroscopy (EIS), surface morphology assessment via scanning electron microscopy (SEM), and X-ray diffraction (XRD). Findings indicated that the WR sample exhibited the highest corrosion resistance (Ecorr=-126 mV) among all samples, showing the highest corrosion potential value. This was followed by the HIPed and HH samples (Ecorr=-288 mV), with the AB sample (Ecorr=-296 mV) showing the least resistance to corrosion. The findings were additionally corroborated through EIS results revealing the formation of oxide film on the alloy surface. The results from EDS indicated the presence of Ni, Cr, Al, Ti, O, and Mo on the surface of the alloy after corrosion. This was further corroborated by the XRD results, which confirmed the peaks corresponding to the oxides of Cr, Ni, Ti, and Al.