Influence of B۴C Nanoparticles on Corrosion Characteristics of Ni Matrix Nanocomposite Coatings Fabricated via Pulse Electroplating Technique
Publish place: Advanced Ceramics Progress، Vol: 9، Issue: 3
Publish Year: 1402
نوع سند: مقاله ژورنالی
زبان: English
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JR_ACERPT-9-3_005
تاریخ نمایه سازی: 8 مهر 1403
Abstract:
The Ni-B۴C nanocomposite coatings were fabricated via pulse electrodeposition on a copper substrate, and the effects of pulse current density, duty cycle, and pulse frequency on the microstructure, morphology, and corrosion characteristics were assessed. Field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) tests were employed. The baseline electrodeposition conditions were set at i = ۱ A/dm², γ = ۵۰%, and f = ۱۰ Hz. Embedding B۴C nanoparticles (NPs) into the nickel matrix significantly reduced the nickel crystallite size for the primary (۱۱۱) and (۲۰۰) crystal planes. Increasing the pulse current density from ۱ to ۴ A/dm² caused a substantial decrease in the incorporation rate of B۴C NPs, from ۵.۵ to ۲.۹ vol.%. However, an increase in the duty cycle from ۲۵ to ۵۰% and the pulse frequency from ۱ to ۱۰ Hz raised the incorporation rate to ۵.۵ vol.% and ۴.۶ to ۳.۹ vol.%, respectively. Surprisingly, the incorporation of B۴C led to an increase in the corrosion current density from ۲.۳۰۱ to ۴.۵۴۱ µA/cm². Increasing the pulse current density from ۱ to ۴ A/dm² and the duty cycle from ۲۵ to ۵۰% notably decreased the corrosion current density from ۴.۵۴۱ to ۱.۳۷۵ µA/cm² and from ۷.۲۴۳ to ۴.۵۴۱ µA/cm², respectively. Conversely, the minimum corrosion current density of ۰.۵۹۹ µA/cm², deposited at ۱ Hz, increased significantly to ۴.۵۴۱ µA/cm² at ۱۰ Hz, while the B۴C NPs content increased from ۳.۹ to ۵.۵ vol.%, possibly due to a more uniform distribution of B۴C NPs at ۱ Hz. The Ni-B۴C specimen deposited at ۱ Hz exhibited a higher Rct compared to the pure nickel sample under baseline conditions, indicating strong consistency between the EIS and potentiodynamic results.
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Authors
Mohammad Kaveh
MSc, Department of Materials Engineering, School of Engineering, Yasouj University, Yasouj, Iran.
Mohammad Sajjadnejad
Assistant Professor, Department of Materials Engineering, School of Engineering, Yasouj University, Yasouj, Iran.
Abbas Mohassel
Assistant Professor, Department of Materials Engineering, School of Engineering, Yasouj University, Yasouj, Iran.
Nader Setoudeh
Associate Professor, Department of Materials Engineering, School of Engineering, Yasouj University, Yasouj, Iran.
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