Preparation of Ni-W/SiC nanocomposite coatings by electrochemical deposition

Synthesis and Characterization of Ni–W/Cr2O3 Nanocomposite Coatings Using Electrochemical Deposition Technique

“…Higher current density allows for higher composite coatings growth rate. This however does not necessarily translate to better coatings, because higher current densities pave the way for creation of internal stresses, which once accumulated, lead to crack formation and propagation [41]. It was observed that dense and compact Ni-W/Cr 2 O 3 coatings were obtained at current densities below 1 A•dm −2 in line with existing literature [19].…”

“…Particle agglomeration on the surface of the coatings can be attributed to insufficient dispersion of Cr 2 O 3 nanoparticles in the plating solution. When current density increased from 1 A•dm −2 to 3 A•dm −2 , it can be seen that the crystal grains of the composite coatings became more distinct [41]. Increase in current density from 1 to 2 A•dm −2 resulted in an increase in the Coulomb force that exists between the cathode surface and the adsorbed metal ions and this increased the content of Cr 2 O 3 nanoparticles in the deposited coatings from 2.1 wt.% to 2.6 wt.%, respectively (see EDS Figure 8).…”

Investigation of Electrodeposition External Conditions on Morphology and Texture of Ni/SiCw Composite Coatings

“…These phenomena made clear that the electrodeposits prepared at low current density tend to form smooth and luminous surface morphology with fine grains. (1) where TC (hkl) is the texture coefficient of the specific (hkl) plane; I (hkl) and I0 (hkl) are the diffraction intensity of the electrodeposited nickel and the powder pattern in the JCPDS cards, respectively; n is the number of reflection peaks used in the calculation. Three peaks of (111), (200) and (221) are used to calculate the texture coefficient.…”

“…In order to resolve this problem, the method of co-deposition insoluble solid particles in metal matrix was established and recognized for fabrication the composite coatings. The reinforcing particles, suspending in the electrolyte, are entrapped and incorporated into the metal matrix by adopting suitable methods during the co-deposition process, such as electrophoresis, adsorption or mechanical entrapment [1]. In 1928, Fink et al [2] introduced the co-deposition method to produce Cu/graphite composite coatings that applied in car engines for the first time.…”

WOx‐Modified Ni Catalyst Supported on Mesoporous Silica with Extra‐Large Mesopores for CO Methanation

“…In addition, Liu et al found that the synergistic effect between Ni and WO 3 in the Ni–W–Ce oxide catalysts minimized the coke formation and stabilized the metal particles . Li et al reported that Ni–WO 3 /SiC nanocomposite is an excellent coating for metal protection . Pan et al found that the introduction of W species into Ni 2 P/SiO 2 promoted the hydrodeoxygenation pathway .…”