Effect of nano Al2O3 coated Ag addition on the corrosion resistance and electrochemical behavior of Cu-Al2O3 nanocomposites

Abstract

Cu-Al2O3 coated Ag nanocomposite is prepared by electroless chemical deposition, followed by PM technique. Nano Al2O3 by 3, 6, 9, and 12 wt.% is firstly coated with 5 wt.% nano Ag then the above four mentioned percent are mechanically milled with nano copper for 1 h by 350 rpm. Followed by compacted under 700 MPa, then sintered at 950 °C in H2 gas inert. The microstructure and mapping were estimated to evaluate the homogeneity of constituent. The amount of relative density decreases with increasing the content of Al2O3 nanoparticles. In addition, electrical resistivity is increase gradually by the addition of Al2O3 coated Ag and thermal conductivity decrease by increasing the Al2O3 coated Ag nanocomposite content. The electrochemical behavior and corrosion resistance of the prepared samples are studied. The resultant indicates that 9 wt.% Al2O3 sample has the lowest corrosion rate. In addition, it is the most suitable for electrochemical deposition.