Authors : Farqad Saleem Murad, Samir Hamid Awad and Elham Abdalmajeed
Abstract: Ceramic coatings on Al alloys were prepared via. micro arc oxidation process using natural rock (10 g/L fired and unfired porcelanite) and (2.4 g/L) nano-TiO2 additives. The phase composition, microstructure (SEM and EDX), micro hardness, thickness, roughness and wear resistance of the coatings were studied. The results showed that the thick and hard (γ-Al2 O3 ceramic coatings can be deposited by MAO process on Al alloys using electrolytes contained fired porcelanite with modified tribological properties and less porosity and its non-uniform distribution in the structure. The addition of nano-TiO2 recorded the highest hardness and reduced the pore size and tunnels in coatings structure.
Farqad Saleem Murad, Samir Hamid Awad and Elham Abdalmajeed, 2018. Effects of Natural Rock and Nano-TiO2 Additives on Al2 O3 Layer Deposited on Al Alloys by Micro-Arc Oxidation (MAO). Journal of Engineering and Applied Sciences, 13: 1201-1209.