Synthesis and characterization of Ni–\(\hbox {Si}_{3}\hbox {N}_{4}\) nanocomposite coatings fabricated by pulse electrodeposition

  • Seyyed Mohammad NooriEmail author


Pure Ni and Ni–silicon nitride \((\hbox {Si}_{3}\hbox {N}_{4})\) nanocomposite coatings have been successfully fabricated on copper substrates by a pulse electrodeposition method employing the Watts bath. The obtained coatings were characterized with X-ray diffractometry and scanning electron microscopy. Also, surface hardness and the corrosion behaviour of the coatings were analysed by potentiodynamic polarization and electrochemical impedance spectroscopy in a 3.5% NaCl solution. It was found that incorporation of \(\hbox {Si}_{3}\hbox {N}_{4}\) particulates has reduced the crystallite size and also changed the growth orientation of the crystallite from (111) to (220) and (200) crystal planes. The co-deposition of \(\hbox {Si}_{3}\hbox {N}_{4}\) in the Ni matrix led to better properties of these coatings. Accordingly, the hardness value of nanocomposite coatings was about 80–140 Hv higher than that of pure nickel due to dispersion-strengthening and matrix grain refining and increased with the enhancement of incorporating \(\hbox {Si}_{3}\hbox {N}_{4}\) particle content. The presence of the \(\hbox {Si}_{3}\hbox {N}_{4}\) particulates slightly decreases the current efficiency. The current efficiency was decreased by increasing current density from 1 to 4 A \(\hbox {dm}^{-2}\). Moreover, the corrosion resistance of nanocomposite coatings was significantly higher than the pure Ni deposit. Also, the Ni–\(\hbox {Si}_{3}\hbox {N}_{4}\) coating produced at a density of 4 A \(\hbox {dm}^{-2}\) showed the lowest corrosion rate (0.05 mpy).


Composite coating pulse electrodeposition co-deposition hardness corrosion 


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© Indian Academy of Sciences 2019

Authors and Affiliations

  1. 1.School of Metallurgy and Materials Engineering, College of EngineeringUniversity of TehranTehranIran

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