It has been reported that the size and shape of the pores depend on the structure of the base metal, the type of electrolyte, and the
conditions of the anodizing process. The paper presents thin Al2O3 oxide layer formed under hard anodizing conditions on a plate
made of EN AW-5251 aluminum alloy. The oxidation of the ceramic layer was carried out for 40–80 minutes in a three-component
SAS electrolyte (aqueous solution of acids: sulphuric 33ml/l, adipic 67 g/l, and oxalic 30 g/l) at a temperature of 293–313K, and
the current density was 200–400 A/m2. Presented images were taken by a scanning microscope. A computer analysis of the binary
images of layers showed different shapes of pores. The structure of ceramic Al2O3 layers is one of the main factors determining
mechanical properties.The resistance to wear of specimen-oxide coating layer depends on porosity, morphology, and roughness of
the ceramic layer surface.A3D oxide coatingmodel, based on the computer analysis of images froma scanning electron microscope
(Philips XL 30 ESEM/EDAX), was proposed
