Effect of pulse current density on microstructure and wear property of Ni-TiN nanocoatings deposited via pulse electrodeposition

Synthesis of well-dispersed TiO2/CNTs@CoFe2O4 nanocomposites and their photocatalytic properties

Role of Mo on tribological properties of atmospheric plasma-sprayed Mo-NiCrBSi composite coatings under dry and oil-lubricated conditions

Synthesis and characterization of Ni-W/TiN nanocomposite coating with enhanced wear and corrosion resistance deposited by pulse electrodeposition

Microstructure-corrosion resistance relationship of direct and pulse current electrodeposited Zn-TiO2 nanocomposite coatings

Textural and structural evolution of pulse electrodeposited Ni/diamond nanocomposite coatings

Pure Zn and Zn matrix composite coatings containing nano-sized SiC particles with an average size of 50 nm were prepared from the zinc sulphate bath. The effect of the particle concentration and current density on the amount of particles embedded was examined. Electron microscopic studies revealed that the coating morphology was modified by the presence of SiC nanoparticles. Corrosion resistance properties of the coatings were studied using a potentiodynamic polarisation technique in 1M NaCl solution. It was established that agglomeration of nanoparticles worsens corrosion resistance properties of Zn–SiC coatings. However, the presence of well dispersed nanoparticles significantly improves the corrosion resistance of the zinc. Incorporation of SiC nanoparticles also improves the microhardness of the zinc matrix.

Direct current electrodeposition of Zn and Zn–SiC nanocomposite coatings

The effects of applied current density (1–10 A/dm2), pulse frequency (1–100 Hz) and duty cycle (10–75 %) on the morphology and microhardness of Ni and Ni–ZnO coatings, incorporation rate of ZnO nanoparticles, current efficiency and deposition rate were investigated. Ni–ZnO composites exhibited a nodular morphology. At low current densities, smooth and compact Ni–ZnO coatings were obtained. As the current density increased more gaps and defects appeared on the coatings surface. Maximum incorporation rate of 4.04 vol% was achieved at the current density of 10 A/dm2. Presence of ZnO nanoparticles in the electrolyte improved the current efficiency of the process and deposition rate of the matrix. The microhardness values of the composites were considerably higher than those of the nickel coatings.

Alkaline Electrodeposition of Ni–ZnO Nanocomposite Coatings: Effects of Pulse Electroplating Parameters

Thin films of titanium oxide were obtained by dip-coating, using the sol–gel method. TiO2 powder (Degussa, P25) and polyethylene glycol (PEG) were added to enhance the photocatalytic properties of resulting films. Effects of experimental variables on the photocatalytic properties of the coatings were evaluated based on the degradation efficiency of the reference dye (Methylene blue). The photocatalytic activity of resulting TiO2 coatings was improved with the loading of TiO2 powder (Degussa, P25) and PEG in the sols. The electron-hole pair photogeneration increases with the energy of irradiation and improves photocatalytic efficiency. Increasing coating thickness leads to a rough surface with more reaction sites. Photodegradation conversion of Methylene blue (Mb) decreases with an increase in the initial concentration of Mb.

Influence of operational parameters on the TiO2 photocatalytic degradation of Methylene blue

Purpose – This paper aims to coat ternary composite NiBP-graphite films by Dynamic Chemical Plating “DCP” technique with a growth rate of at least 5 μm/h, which makes this technique a worthy candidate for production of composite films. Electroless nickel plating method can be used to deposit nickel–phosphorous and nickel–boron coatings on metals or plastic surface. However, restrictions such as toxicity, short lifetime of the plating-bath and limited plating rate have limited applications of conventional electroless processes. Design/methodology/approach – DCP is an alternative for producing metallic deposits on non-conductive materials and can be considered as a modified electroless coating process. Using a double-nozzle gun, two different solutions containing the precursors are sprayed simultaneously and separately onto the surface. With this technique, NiBP-graphite films are fabricated and their corrosion and tribological properties are investigated. Findings – With a film thickness of 2 μm, tribologi...

A. Mozafari

Papers

Textural and structural evolution of pulse electrodeposited Ni/diamond nanocomposite coatings

Direct current electrodeposition of Zn and Zn–SiC nanocomposite coatings

Alkaline Electrodeposition of Ni–ZnO Nanocomposite Coatings: Effects of Pulse Electroplating Parameters

Influence of operational parameters on the TiO2 photocatalytic degradation of Methylene blue

Characterization of NiBP-graphite composite coatings deposited by dynamic chemical plating