Characterization and performance evaluation of Cu-based/TiO2 nano composites

Abstract

Copper and copper alloys are used in industrial applications and food contact surfaces due to their desirable properties; copper metal matrix composites have been exciting researchers' attention in recent years since they can offer many valuable characteristics. The present study investigated the effects of the TiO2 nanoparticles addition with different weight percent on the hardness and corrosion behavior of copper nanocomposites. The powder metallurgy method was used to fabricate the Cu/TiO2 reinforced with different weight fractions of TiO2 nano particles up to 12 wt.%. The corrosion behavior of fabricated specimens is evaluated using potentiodynamic polarization curves and electrochemical impedance spectroscopy in different solutions. These solutions were 3.5wt.% NaCl, 0.5 NaOH and 0.5 M H2SO4 reflected different pH. The results showed that the addition of TiO2 nano particles improves pure copper's hardness. The hardness of pure copper increased from 53 to 91 HV by adding 12 wt.% TiO2. The corrosion current density (Icorr) of copper nanocomposites test specimens was higher than Icorr of pure copper in all test solutions. As TiO2 nano particles increase, the corrosion resistance of Cu nano composites decreased. All test specimens exhibited little corrosion current density in 3.5 wt.% NaCl solution as compared with other test solutions.

Electrochemical behaviour of graphene and alumina whisker co-reinforced copper matrix composites

“…The electrochemical properties of the composites in neutral, alkaline, and acidic environments are slightly different. The corrosion current of all samples in an acidic environment is higher than that in both neutral and alkaline environments, as confirmed by Saber et al's [26] research, in which the acidic solution is more severe than both the alkaline and salty solutions, although additional reactions occur in 0.5 M NaOH and 0.5 M H 2 SO 4 .…”

“…The electrochemical properties of the composites in neutral, alkaline, and acidic environments are slightly different. The corrosion current of all samples in an acidic environment is higher than that in both neutral and alkaline environments, as confirmed by Saber et al's[26] research, in which the acidic solution is more severe than both the alkaline and salty solutions, although additional reactions occur in 0.5 M NaOH and 0.5 M H 2 SO 4 .The electrochemical behaviour of Cu matrix composites is primarily determined by the nature of the ingredients, microstructure, and corrosive environment. The chemical stability and impermeability of Al 2 O 3 whiskers and graphene in the composite can shield them from corrosion, as shown in Figure4, and no corrosion products, such as attached oxide films, were found on the surfaces of alumina and graphene.…”

“…When the Cu matrix composites were exposed to a neutral environment of 3.5 wt-% NaCl solution, the anodic copper is first oxidised to Cu + ion before reacting with chloride ion to generate an unstable CuCl film, which further reacts with chloride ions to form soluble CuCl 2 − diffusion into the corrosive medium as following reactions [26]. The SEM images in Figure 4 and the corresponding EDS results of spots 1 and 3 in Table 4 confirm the anodic reactions of the copper matrix in the NaCl solution.…”

Designing a Bipolar Membrane Electrolyzer for NaCl Electrolysis to Produce High-Quality NaClO

“…Finally, they reached the equilibrium. The generated Ti 2 O 3 and TiO combined together and formed a special complex (Figure g), which made the anode more stable. − The Ti x O y complex cannot be formed on the anode in the CEM and M-less electrolyzers. It can only be formed under the alkaline condition in the BPM electrolyzer.…”

Wear Behavior Prediction for Cu/TiO2 Nanocomposite Based on Optimal Regression Methods

“…Studies in recent times focused on estimating the nanoparticles' effect on the mechanical properties and wear resistance of metal matrix nanocomposites. Most of these studies focus on the different nanoparticles reinforcing addition to producing metal matrix nanocomposites, leaving only a few studies that focused on the TiO 2 addition effect on Cu's mechanical properties and wear behavior 8 . Moghanian et al 7 studied the effect of addition 1-3wt% of TiO 2 to copper.…”