Corrosion behavior of nanostructured Ni‐Si₃N₄ composite films: A study of electrochemical impedance spectroscopy

Abstract

Ni‐Si3N4 nanocomposite films with both the consecutive Ni crystallites and dispersed Si3N4 particles in the nanometer range have been fabricated using DC electroplating technique, and characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), and X‐ray diffraction (XRD). The corrosion resistance of the Ni‐Si3N4 nanocomposite film has been compared to that of pure Ni coating through polarization. Meanwhile, the corrosion process of Ni‐Si3N4 nanocomposite film in neutral 3.5% NaCl solution has been investigated using electrochemical impedance spectroscopy (EIS). The results show that the Ni‐Si3N4 nanocomposite film is more resistant to corrosion than the pure Ni coating. The corrosion of Ni‐Si3N4 nanocomposite film is controlled by electrochemical step, and the whole corrosion process is divided into two sequential stages. The main corrosion type of Ni‐Si3N4 nanocomposite films in neutral 3.5% NaCl solution is pitting.

Advances in precision micro/nano-electroforming: a state-of-the-art review

“…Due to the presence of Si 3 N 4 nanoparticles, the microhardness of the deposited layer and wear resistance were enhanced compared with no Si 3 N 4 nanoparticles. The nanostructured Ni-Si 3 N 4 composite films were investigated by Li et al [213] and showed the surface morphology of the electrodeposited Ni-Si 3 N 4 nanocomposite film coatings was more uniform and denser than that of pure Ni. XRD analysis demonstrated that the grain size of Ni-Si 3 N 4 was less than 35 nm, which could indirectly improve the hardness of coatings.…”

The influence of pulse plating parameters on microstructure and properties of Ni-W-Si3N4 nanocomposite coatings

“…Incorporation of Si 3 N 4 particles in Ni or a Ni-based alloy matrix during electrodeposition obviously improves its hardness and other physical properties [17][18][19]. Li et al [20] have reported that Ni-Si 3 N 4 nanocomposite film is more resistant to corrosion than pure Ni coating. Tripathi et al [21] have studied the preparation and characteristics of Ni-Fe-Si 3 N 4 nanocomposites.…”

“…Gyawali et al [22] confirmed that the scratch resistance of the deposited Ni-W coating were greatly improved through incorporating Si 3 N 4 . While synthesis of various Ni-based composite coatings co-deposited with Si 3 N 4 nanoparticles using electrodeposition method have been widely reported [16][17][18][19][20][21][22], no systematic investigation is about the effect of plating conditions (duty cycle, frequency, current pattern and presence of Si 3 N 4 nanoparticles) on the development of microstructure and mechanical properties of the Ni-W-Si 3 N 4 coatings. In the present work, Ni-WSi 3 N 4 nanocomposite coatings were prepared by pulse current electrodeposition technique.…”

Wear and corrosion resistant properties of electrodeposited Ni composite coating containing Al2O3–TiO2 composite powder

“…3 Numerous nickel matrix composite coatings have been electrodeposited from different electrolyte baths containing nano/micrometre sized inert particles such as TiO 2 , SiC, CeO 2 , Al 2 O 3 , TiC, ZrO 2 , etc. [4][5][6][7][8][9][10][11] In recent years, many papers have been published on the properties of electrodeposited Ni/TiO 2 and Ni/Al 2 O 3 composite coatings. [12][13][14][15][16][17][18][19] Sun and Li reported decreased wear rate and coefficient of friction for Ni/TiO 2 coatings with increase in titania nanoparticle content.…”