فهرست نشریات علمی دسترسی آزاد ایران

In recent decades, electroplating as a fundamental electrochemical technique has impressed the world of electrochemistry, tribology, and corrosion science by magnificent achievements that led to enhance the mechanical, texture, tribology, and corrosion characteristics. In this paper, the aim is to present and analyze the textural, mechanical, morphological, tribological, and corrosion characteristics of electrodeposited nickel-based nanocomposite coatings reinforced with secondary micro- and nano particles using X-ray diffraction, scanning electron microscopy, and atomic force microscopy. The focus is to assess the influence of secondary phase nanoparticles on the strengthening of the composite coatings through the columnar growth of nickel grains since the increase in germination and decrease in growth causes the large and columnar nickel grains to become finer with small and coaxial microstructure. In addition, the corrosion assessments conducted on nickel and nickel-based composite coatings indicate that the corrosion current density of the Ni composite coatings was much lower in comparison to the pure nickel coating, for instance in 3.5 wt. % NaCl solution which can be attributed to the decrease in surface roughness and particularly the advantageous chemical stability of secondary phase nanoparticles. This stability facilitates the reduction of pore size in the nanocomposite coatings and prevents the occurrence of pitting corrosion. Typically, lowering the surface roughness reduces the corrosion rate by minimizing the corrosion sites existing on the surface. Nevertheless, pulse plating significantly decreases the grain size in comparison to conventional DC plating techniques. Consequently, nickel composite nanocrystalline coatings with lower grain size exhibit enhanced corrosion resistance.