TYPE OF WEAR OF ALUMINIUM OXIDE LAYERS DEPENDING\nON MANUFACTURING PARAMETERS

Abstract

The article presents the type of wear of Al2O3 layers produced on the aluminium alloy EN AW-5251 depending\non the production parameters. Oxide layers were produced by using DC anodizing in a ternary electrolyte at\nvariable current density and electrolyte temperature. The layer scratch tests were carried out using a Micron-\nGamma microhardness tester. The scratches of oxide layers were tested for the geometric structure of the\nsurface using a Form TalySurf 2 50i contact profilograph. Contact thickness measurements were also made\nusing a Dualscope MP40 device based on the eddy-current method. Using a scanning microscope (SEM),\nphotos of the sample surfaces were taken to show and compare the surface morphology of the anodized\nlayers in various parameters. Based on the research, it can be concluded that changes in the conditions of the\nproduction process of Al2O3 layers (electrolyte temperature and current density) have an impact on the type\nof tribological wear and changes in layer thickness. The largest thickness of the oxide layer (19.44 μm) was\nmeasured for Sample B produced at a current density of 3A/dm2 at an electrolyte temperature of 283 K, which\nwas also characterized by the lowest value of the ratio of parameters f1 to f2 (0.584). The smallest thickness\n(5.32 μm) was measured for the Sample C anodized at 1 A/dm2 at 303 K, this sample had the largest ratio f1\nto f2 (1.068) for the produced Al2O3 layers. Thanks to the parameters f1 and f2 and the calculation of their\nratio, the wear process for Sample B was determined as scratching and microcutting, while for Sample C as\ngrooving.\n\n