Anodizing as an electrochemical coating method has been widely used in aerospace industry, nanomaterial, aoutomobile manufacturing. By aluminium anodizing pourous coating is formed on the metal that is considered from two viewpoint. The first viewpoint is related to porous coating arameters such as interpore distance and pore diameter that is used in the deposition of various metals to attainment the proper magnetic properties. The second view also is about improving the surface properties of aluminium erospace alloys such as hardness and corrosion resistance. In the first part of this study mild and hard anodizing in various voltage and electrolyte on pure and aluminium alloy 1100 was prformed. Study of current-voltage curves during the anodization and Field emission scanning electron microscope(FESEM) images showed markedly ignificantltly increased in current level with addind acid sulfuric to electrolyte. The presence of alloying elements decreased quality of coating and reduce growth rate af oxid layer. Increasing of electrolyte tempreture leaded to increasing of anodizing current and growth rate of oxide layer. Pore diameter, barrier layer thickness and interpore distance was dependent on the voltage and current is only effective on the growth rate and thickness of the oxide layer. In the second part of this study, anodization rocess in acid sulfuric at three different voltage(25,30,35V) and two different tempreture(0, -10?) were conducted on aerospace aluminium alloy(AA2024). The anodic coating were characterizied by x-ray diffraction(XRD), Grazing Incidence X-Ray Diffraction (GIXRD), scanning electron microscope(SEM), FESEM, microanalysis(EDS), microhardness, roughness and thickness measurement. The results indicated that the sample thickness increased with increasing the voltage and the temperature. At both tempreture there is an optimum level between coating voltage(30V) and microhardness and also coating voltage and roughness. The best order of nanocell in the AAO was obtained in 35V and -10?. Tow-step anodizing process improve the order of nanocells by reduction of empty space between nanocell. According to the potantiodynamics polarization curve of anodized aluminium at 0? and different voltage, the best corrosion resistanc was obtained in 25V. finally the possibility of production of hybride cotaing AAO/Ni-P on aluminium alloy2024 by electroless plating was studied. By this coating corrosion rate reduced about 92% compared with anodized aluminum alloy2024. Heat treat of hybride coating was performed at 200,400,600? and the maximum value of coating microhardness was about 1190 vickers at 400? that This value of hardness is significant for aluminium alloy 2020.
