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Dongjin Metal.Co., Ltd(Received July 9, 2014 ; revised August 4, 2014 ; accepted August 4, 2014)AbstractThe present work is concerned with the formation behavior of anodic oxide films on Al7075 alloy undera galvanostatic condition in 20 vol.% sulfuric acid solution. The formation behaviour of anodic oxide filmswas studied by the analyses of voltage-time curves and observations of colors, morphologies and thicknessesof anodic films with anodization time. Hardness of the anodic oxide films was also measured with anodizationtime and at different positions in the anodic films. Six different stages were observed with anodiziation time: barrier layer formation (stage I), pore formation (stage II), growth of porous films (stage III), abnormalrapid oxide growth (stage IV), growth of non-uniform oxide films (stage V) and breakdown of the thickoxide films under high anodic voltages (stage VI). Hardness of the anodic oxide films appeared to decreasewith increasing anodization time and with the position towards the outer surface. This work provides usefulinformation about the thickness, uniformity, imperfections and hardness distribution of the anodic oxide filmsformed on Al7075 alloy in sulfuric acid solution.

Formation Behavior of Anodic Oxide Films on Al7075 Alloy in Sulfuric Acid Solution