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Corrosion Resistance and Quality of Sealed Porous Alumina Coatings

M. Zemanov√°, M. Chovancov√°, P. Fellner, and K. Prekopp

Department of Inorganic Technology, Faculty of Chemical Technology, Slovak University of Technology, SK-812 37 Bratislava


Abstract: The sealing of porous anodic oxide films on aluminium by the use of sol-gel method has been proposed as an alternative to the hydrothermal sealing method or cold impregnation.Corrosion resistivity of samples prepared by these various sealing methods was investigated using accelerated corrosion test (STN 03 8131) in the condensation chamber. The sealing quality and continuity of prepared samples were also investigated (tests ISO 3210 and ISO 2085). The obtained results were compared and evaluated. Hydrothermally sealed anodized samples on aluminium give qualitative, continuous coatings with high corrosion resistivity. The high corrosion resistivity and continuous coating is property of anodized coating treated by the sol-gel method. The corrosion resistivity of samples sealed by cold impregnation is low.

Full paper in Portable Document Format: 523a152.pdf


Chemical Papers 52 (3) 152–155 (1998)

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