The Teflon impregnation of anodic coating onto aluminium substrate

Przemysław KWOLEK* – Department of Materials Science, Rzeszow University of Technology, Rzeszów, Poland; Patrycja GÓRECKA; Andrzej OBŁÓJ – Research & Development Laboratory for Aerospace Materials, Rzeszow University of Technology, Rzeszów, Poland; Urszula KWOLEK
– Faculty of Chemistry, Jagiellonian University, Kraków, Poland; Kamil DYCHTOŃ, Marcin DRAJEWICZ, Jan SIENIAWSKI – Department of Materials Science, Rzeszow University of Technology, Rzeszów, Poland
Please cite as: CHEMIK 2016, 70, 7, 361–368

Aluminium and its alloys, due to their low density and good
mechanical properties, especially after heat treatment, are widely
applied in the aircraft and automotive industry. In order to enhance
the corrosion resistance of aluminium and its alloys, thick oxide
coatings are produced in the anodizing process. The anodic coatings
improve also the adhesion of paints. However, their hardness and
abrasion resistance is insufficient. Therefore, hard anodic coatings are
produced onto aluminium and its alloys. The characteristic properties
of hard anodizing are: low temperature of the bath (usually below
273 K), high current density (over 2.5 A.dm−2) [1]. The thickness of
hard anodic coatings should be over 51 μm [2]. Elements anodized
in such a process are widely applied in the aircraft and automotive
industry (e.g. pistons and cylinders of reciprocating engines, elements
of hydraulic systems) [1]. However, the tribological properties of the
hard anodic coatings need further improvement.

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