Combined kinetic and X-ray electron probe microanalysis characterization of local porosity variation and pore shape across anodic alumina films |
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| Authors: | G.S. Patermarakis V.N. Kytopoulos |
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| Affiliation: | a School of Chemical Engineering, Department of Materials Science and Engineering, National Technical University, Iroon Polytechniou 9, Zografou 157 80, Athens, Greece
b School of Applied Physical and Mathematical Sciences, Department of Mechanics, SEM - Laboratory, National Technical University, Iroon Polytechniou 9, Zografou 157 80, Athens, Greece |
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| Abstract: | Porous anodic alumina films on Al were prepared by anodic oxidation of Al in H2SO4 electrolyte at a constant temperature and current density and different thicknesses, up to ≈ 41 μm. Their cross section was examined by EPMA for revealing the variation of local porosity across the films and shape of pores while a kinetic model for film growth was developed describing the variation of pore diameter. It was found that the pores open, and local porosity increases, towards the film surface, predicting a conical pore shape, while the results coincided with those obtained by kinetic study. The EPMA analysis combined with kinetic results emerges as a promising tool for studying structural features of these films. |
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| Keywords: | Anodic alumina Thick films X-ray EPMA Kinetics Porosity Pore shape |
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