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Journal:The International Journal of Advanced Manufacturing Technology
Key Words:GH4169D superalloy Electrochemical machining Electrochemical dissolution behavior Passive film
Abstract:GH4169D alloy is a newly developed superalloy with promising applications in the critical components of aero-engines. Electrochemical machining (ECM) represents one of the primary methods for manufacturing these components. The electrochemical dissolution characteristics form the basis for determining processing parameters in ECM. In this study, the key characteristics of the passivation films on GH4169D alloy, including morphology, chemical composition, and corrosion resistance, were systematically analyzed solutions using polarization curves, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The results demonstrate that the passivation film formed in NaNO3 solution exhibits a denser and more uniform structure with superior corrosion resistance. Furthermore, the microstructure and surface roughness of GH4169D alloy under varying current densities were investigated. When the current density is below 40 A/cm², the surface quality improves with increasing current density; however, beyond this threshold, further improvements in surface quality become negligible. Subsequently, the electrochemical machining process for blisk channels (hereafter referred to as channel ECM) was conducted. The best machining performance under the investigated parameters can be achieved where an electrolyte of 10% NaNO3, a cathode feed rate of 0.5 mm/min, a processing voltage of 25 V, and a pulse power duty ratio of 50%. Blisk channels with an average width of 3.55 mm, a taper angle of 1.08°, and a surface roughness Ra of 0.325 μm at the hub were successfully fabricated. Finally, dissolution models were established to describe the dissolution behavior of GH4169D in NaNO3 and NaCl solutions.
Co-author:Lian, Zhonghao,Cao, Qiannan,Geng, Yongxiu,Song, Shasha
Indexed by:Journal paper
Correspondence Author:Zhang, Juchen
Discipline:Engineering
Document Type:J
Translation or Not:no
Date of Publication:2025-12-05
Included Journals:SCI