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

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Area of Science:

  • Materials Science
  • Corrosion Engineering
  • Nanotechnology

Background:

  • Copper and its alloys are vital in industrial and food contact applications.
  • Copper metal matrix composites are gaining research interest for their enhanced properties.
  • Titanium dioxide (TiO2) nanoparticles offer potential for reinforcing copper matrices.

Purpose of the Study:

  • To investigate the impact of TiO2 nanoparticle addition on copper nanocomposite hardness.
  • To evaluate the corrosion behavior of Cu/TiO2 nanocomposites in diverse chemical environments.
  • To determine the relationship between TiO2 content and the mechanical and electrochemical properties of copper.

Main Methods:

  • Fabrication of Cu/TiO2 nanocomposites using powder metallurgy with varying TiO2 weight percentages (up to 12 wt.%).
  • Assessment of hardness using Vickers hardness testing.
  • Evaluation of corrosion behavior via potentiodynamic polarization and electrochemical impedance spectroscopy.
  • Testing in 3.5 wt.% NaCl, 0.5 M NaOH, and 0.5 M H2SO4 solutions representing different pH levels.

Main Results:

  • Hardness of pure copper increased significantly from 53 to 91 HV with 12 wt.% TiO2 addition.
  • Corrosion current density (Icorr) of Cu/TiO2 nanocomposites was higher than that of pure copper across all tested solutions.
  • Corrosion resistance of copper nanocomposites decreased as the concentration of TiO2 nanoparticles increased.
  • Specimens showed lower corrosion current densities in 3.5 wt.% NaCl solution compared to NaOH and H2SO4 solutions.

Conclusions:

  • TiO2 nanoparticle reinforcement enhances the hardness of copper.
  • Increased TiO2 content in copper nanocomposites leads to reduced corrosion resistance.
  • The corrosive environment significantly influences the corrosion behavior of Cu/TiO2 nanocomposites, with NaCl being the least aggressive tested medium.