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Abstract
In this paper Ni-TiO2 nanocomposite coatings with different sizes of TiO2 nanoparticles were successfully prepared by electrodeposition process from a nickel electrolyte in which the TiO2 nanoparticles were suspended. The influence of relevant deposition parameters on the nanocomposite coating characteristics was discussed. X-ray diffractometer (XRD) has been applied in order to investigate the phase structure of the nanocomposite coatings. The surface morphology of nanocomposite coatings was characterized by a scanning electron microscopy equipped with an energy dispersive spectroscopy (SEM/EDS). The electrodeposited nanocomposite coatings obtained at different deposition parameters were evaluated for their mechanical and corrosive properties. Obtained results show that the size of TiO2 nanoparticles and applied current density during deposition process has a direct effect on mechanical and corrosive properties of nanocomposite coatings. Increasing current density and smaller nanoparticle size has affirmative effect on mechanical properties whereas corrosion resistance of nanocomposite coatings deposited at 3 A.dm-2 current density are higher than the coatings prepared at higher current density values.
Highlights
Ni-based coatings have been widely used in several applications in form of single phase (Ni and Ni alloys) and Ni matrix composites/nanocomposites because of their good mechanical properties, high corrosion, and wear resistance (Miguel et al, 2015)
It is obvious from the pattern that peak intensities increase with increasing current density from 3 to 7 A dm−2 for both nanocomposite coatings produced at different particle sizes of TiO2 nanoparticles
Obtained results show that corrosion resistance of nanocomposite coatings deposited at 3 A dm−2 current density are higher than the coatings prepared at higher current density values
Summary
Ni-based coatings have been widely used in several applications in form of single phase (Ni and Ni alloys) and Ni matrix composites/nanocomposites because of their good mechanical properties, high corrosion, and wear resistance (Miguel et al, 2015). Important process parameters for the production of electrodeposited composite coatings are current density, temperature, particle size, concentration, and bath composition. It is important to adjust the process parameters in order to control the properties of the produced composite coatings that depend on the amount of incorporated particles and their distribution in the metal matrix, as well as, on the microstructural characteristics of the metal matrix (Vaezi et al, 2008).
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