ceramic coatings on Al alloys were prepared via Micro Arc Oxidation process using natural rock additive (10g/l fired and unfired porcelanite), and (2.4g/l) nano-TiO2. 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 ?-Al2O3 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