Corrosion and mechanical behavior evaluation of in-situ synthesized Cu-TiB2 nanocomposite

Abstract

In this paper, the synthesis of the copper matrix nanocomposite and the effect of adding TiB₂ nanoparticles on the copper matrix was investigated. Three different amounts of TiB₂ nanoparticles 5, 10, and 15 wt% were added and sintering was carried out at 900 ^oC for 4 hours under argon atmosphere. The phase formation of achieved nanocomposites was studied by X-ray diffractometer and the morphology of the synthesized samples was studied by field emission scanning electron microscopy and atomic force microscopy. The polarization and electrochemical impedance spectroscopy (EIS) at 3.5 wt% NaCl solution at room temperature was were carried out to evaluate the corrosion behavior of synthesized samples. Results show that adding the TiB₂ nanoparticles decrease the corrosion resistance by the formation of galvanic couples, but the effect of amounts of porosities on the corrosion resistance is higher. It is revealed that the variation of the surface roughness is in direct relation to the value of polarization current density.