In the present work, nano-composites of Ni-P-SiO2-Al2O3 were coated on a 6061 aluminum substrate. The surface morphology of the nano-composite coating was studied by field emission scanning electron microscopy (FESEM). The amount of SiO2 in the coating was determined by Energy Dispersive Analysis of X-Ray (EDX) and the crystalline structure of the coating was examined by X-ray diffractometer (XRD). All the experiments concerning the corrosion behavior of the coating carried out in 3.5%wt NaCl solution and evaluated by electrochemical impedance spectroscopy (EIS) and polarization technique. The results showed that an incorporation of SiO2 and Al2O3 in Ni-P coating at the SiO2 concentration of 10 g/L and 14 g/L Al2O3 led to the lowest corrosion rate (i(corr) = 0.88 mu A/cm(2)), the most positive E-corr and maximum microhardness (537 mu HV). Furthermore, increasing the amount of nanoparticles in the coating was found to decrease CPEdl and improve porosity. (C) 2016 Elsevier B.V. All rights reserved.