الفهرس 
Improvement of mechanical and chemical characterization of reciprocating mower knives surfaces using nanocomposite coatings
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Abstract
Little information is available about the improvement of agricultural reciprocating mower knives using nanotechnology, which work on intense wear and corrosion condition in agricultural fields with short lifetime due to the wear and corrosion effects. Therefore, in this work, the electrodeposition technique has been used to deposit pure Ni and Ni- nanocomposite coatings on the mower knife surface to promote the resistance to corrosion and wear. So, the influence pH of the plating solution and the applied current density on the surface morphology and nanoindentation, fretting, and corrosion resistance of Ni and Ni- nanocomposite coatings were studied.Titanium dioxide (TiO₂), Zinc oxide (ZnO), and carbon nano tubes (CNTs) was selected to prepare nanocomposite coating.The results proved that Ni deposited from acidic bath displayed the large grain sizes than pure Ni deposited from the alkaline bath, and Ni-ZnO, Ni-TiO₂, and Ni-CNTs nanocomposite coatings were successfully embedded in the Ni matrix.. Over a wide range of experiments, the steel coated Ni- nanocomposite coating from an acidic bath alkaline bath illustrated significantly better properties. Moreover, the results proved that the steel coated by Ni- TiO₂ nanocomposite coating (5.42 GPa) is harder than the steel coated by pure Ni (2.7 GPa) and consequently exhibited higher abrasion wear resistance for Ni-TiO2 nanocomposite coatings with weight loss 24.36 mg compared to pure Ni (79.8 mg.) and the mower with weight losses 102.56 mg. The results proved that the steel coated by Ni nanocomposite coating ratio of the hardness to the modulus (H/Er ), the resistance to the plastic indentation (H³/E²), elastic recovery, abrasion wear resistance, scratching and fretting wear resistance