Abstract: The investigation into the effect of time and voltage on anodization of aluminum using 0.1M concentration and 2.5 pH of H2SO4 electrolyte, under 35oC and 2.22amp/cm2 current density was carried out. The result obtained showed that as the time and voltage increases the thickness of the coating on the surface of aluminum increases giving a much desired product for industrial and domestic use. The optimum parameter for the coating was found to be 40minutes and 40volts for a thickness of 800µm.