Abstract
Nickel (Ni) is one of the most important hard coatings. Improvement in its tribological and mechanical properties would greatly enhance its use in industry. Nanocomposite coatings of metals with various reinforced nanoparticles have been developed in last few decades. Titania (TiO2) exhibit excellent mechanical properties. It is believed that TiO2 incorporation in Ni matrix will improve the properties of Ni coatings significantly. The main purpose of the current work is to investigate the mechanical and anti-corrosion properties of the electroplated Nickel nanocomposite with a different percentage of TiO2. The results showed that the content of TiO2 and the microhardness in the Ni-TiO2 coatings first increased and reached the maximum at the loading of 20 g/L, then decreased, due to agglomeration of dioxide of Titania for high concentration of TiO2. The [200] preferred orientation for Ni pure gradually evolved to [111] orientation with increasing TiO2 nanoparticle loading. At 20 g/L of titania, we obtained the minimum crystallite size (27 nm). The anti-corrosion property of nanocomposite coating was carried out in 3.5 % NaCl electrolyte, and the result also showed that the nanocomposite coatings improve the corrosion resistance significantly. This present work reveals that incorporation of TiO2 in nickel nanocomposite coating improves corrosion resistance and mechanical properties of both hardness and corrosion resistance performances, and the improvement becomes at it maximum for 20 g/L of TiO2.
Highlights
Since the late1990s, metal–ceramic composite coatings have been used on automobile parts, appliances, metal furniture, beverage containers, fasteners, and various other industrial products [1,2,3]
3.1 Surface morphology and composition of the coatings Fig. 1 shows surface morphologies of the coatings electrodeposited at different TiO2 nanoparticle loadings in the electrolyte
The results showed that the suspended TiO2 nanoparticle loadings in electrolyte strongly influenced the surface morphology evolution of the coatings
Summary
Since the late1990s, metal–ceramic composite coatings have been used on automobile parts, appliances, metal furniture, beverage containers, fasteners, and various other industrial products [1,2,3]. Composite coatings are formed by components with characteristic dimensionality, such as micro/manometer-size setting in different matrixes [4]. Electrodeposition is a technique for the preparation of excellent performance composite coatings. A characteristic feature of this process is that ceramic particles SiC, CNTs, TiN, and TiO2) suspended in a liquid medium migrate under the influence of an electric field (electrophoresis) and are deposited on an electrode. All charged ceramic particles used to form stable suspensions can be used in electrodeposition. Electrodeposition is affected by parameters such as current density, particle concentration, and bath temperature. [5] found that Co–ZrO2 composite coatings were uniform and well bonded to the substrate, and the thickness of the coating increased with increasing current density. [6] demonstrated that the TiN nanoparticles Xia and al. [6] demonstrated that the TiN nanoparticles
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