| In recent years, nano porous alumina flim have attracted increasing amount of attention due to their potential use in several field of technological interest, such as micro and ultrafiltration catalytic reactors and electrolytes for proton exchange.In this paper, the porous alumina flims were prepared with the method of anodic oxidation. And the influence of the parameters (concentration of electrolyte, voltage, and time and electricity solution temperature) for anodic oxidation on the formation and structure of anodized alumina flims was also discussed. The properties and application of porous alumina flims was mentioned too.The porous alumina flims were prepared with the secondary anodic oxidation in the inner side of aluminum tubes. The oxalic acid electrolyte of different concentration was choosed as the electrolyte. The holes in the nano-array structure anodic aluminum oxide films is hexagon with the diameter of 30-70nm.The microstrue of porous alumina flim was examined in the scanning electron microscope, atomic force microscope. The effect of parameters, such as the concentration of electrolyte, voltage, and time and electricity solution temperature on the order of porous film, the diameter of the hole and the thickness of the flim was discussed. The results showed that in the porous alumina film prepared by secondary anodic oxidation, the hexagonal honeycomb-shaped holes evenly distributed perpendicular to the film surface and grown parallel. The temperature had a great influence on the density and uniformity of the hole. The voltage had a greatest influence on the aperture, and the aperture and space between holes had a linear relationship with the voltage.The mechanics properties were tested by surveying the loading-unloading curve of nanoporous alumina film by nanoindenter. It was found that nano-hardness and elastic modulus of nano-porous alumina flims decreases with the increase of aperture and.thickness of the nanoporous alumina film.
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