EFFECT OF TiO2 NANOPARTICLES IN NI MATRIX ON MECHANICAL AND CORROSION RESISTANCE PROPERTIES

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.

EFFECT OF TiO2 NANOPARTICLES ON THE MECHANICAL AND ANTICORROSIVE PROPERTIES OF Zn-Ni COMPOSITE COATINGS

“…We can say that the incorporation of TiO2 in the coating reducing the corrosion rate (τcorr). An explanation has been given by Saied et al [9], in which they mentioned that TiO2 nanoparticles changes the structure of the metal deposition, which is most fine, because the nanoparticles provide more nucleation sites and delay the growth of Zn-Ni matrix. TiO2 nanoparticles also fill defects and improve corrosion resistance and hardness.…”

“…However, these alloys have low hardness and abrasion resistance with content of nickel, which could be improved by ceramic particle incorporation. The most important nanoparticles used as deposits are oxides or carbides such as Al2O3 [5][6][7], TiO2 [8][9][10][11], SiO2 [12,13], ZrO2 [7], SiC [7]. TiO2 has been used to improve different metallic and organic coatings.…”

“…TiO2 has been used to improve different metallic and organic coatings. TiO2 with a metallic coating significantly contributes to wear and corrosion resistance, better [8][9][10]12]. Vlasa et al [13] indicated that the porous nanocomposite coatings exhibit higher corrosion resistance when compared to pure Zn coatings and is strongly affected by the TiO2 structure and concentration.…”

MORPHOLOGICAL, STRUCTURAL, MICROHARDNESS AND ELECTROCHEMICAL CHARACTERIZATIONS OF ELECTRODEPOSITED Cr AND Ni–W COATINGS

“…[1]. In order to improve the properties of the surface against corrosion and increase the service life of metallic components, various modifications could be applied such as alloying a nickel based layer with other element like Mo, W, Al, SiC, Co [2][3][4][5][6][7]. Despite these coatings, Ni-Cr alloys exhibit better corrosion resistance and superior hot corrosion resistance due to the formation of a continuous chromia scale [8,9] which permits the use of these alloys in many industrial applications.…”

Experimental studies on wear and corrosion resistance of pulse electrodeposited Ni-TiO2 nanocomposite coatings on AISI 304 stainless steel

“…However the electro deposition technique is found to be versatile [12][13][14][15][16], since it offers uniform coatings, smooth surface, fine grains, enhanced surface properties and extended life of the coated surfaces. This method can also be employed to produce complex surfaces with the advantage of reproducibility.Researchers have studied various second phase nanocomposite coatings like oxides based TiO 2 , ZnO, Cr 2 O 3 , Al 2 O 3 , SiO 2 , ZrO 2 , and carbides based SiC, TiC, and nitrides based BN, TiN, Si 3 N 4 [17][18][19][20][21][22]. Using electro deposition technique the coatings produced by direct current (DC), inclusion of foreign particles into the coatings, optimizing the composition, flow of electric current, pulse plating and pulse reverse plating are the…”