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Advances in Materials Science and Engineering
Volume 2015, Article ID 659846, 9 pages
Research Article

Effect of the Electrolyte Temperature and the Current Density on a Layer Microhardness Generated by the Anodic Aluminium Oxidation

1Department of Technologies and Materials, Faculty of Mechanical Engineering, Technical University of Košice, Mäsiarska 74, 042 00 Košice, Slovakia
2The Department of Mechanical Engineering, Institute of Technology and Businesses in České Budějovice, Okružní 10, 37001 České Budějovice, Czech Republic
3Department of Mathematics, Informatics and Cybernetics, Faculty of Manufacturing Technologies with a Seat in Prešov, Technical University of Košice, Bayerova 1, 080 01 Prešov, Slovakia

Received 24 September 2014; Revised 19 March 2015; Accepted 23 March 2015

Academic Editor: Markku Leskela

Copyright © 2015 Emil Spišák et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The paper investigates the influence of the chemical composition and temperature of electrolyte, the oxidation time, voltage, and the current density on Vickers microhardness of aluminium oxide layers, at the same time. The layers were generated in the electrolytes with different concentrations of sulphuric and oxalic acids and surface current densities 1 A·dm−2, 3 A·dm−2, and 5 A·dm−2. The electrolyte temperature varied from −1.78°C to 45.78°C. The results have showed that while increasing the electrolyte temperature at the current density of 1 A·dm−2, the increase in the layer microhardness values is approximately by 66%. While simultaneously increasing the molar concentration of H2SO4 in the electrolyte, the growth rate of the microhardness value decreases. At the current density of 3 A·dm−2, by increasing the electrolyte temperature, a reduction in the microhardness of the generated layer occurs with the anodic oxidation time less than 25 min. The electrolyte temperature is not significant with the changing values of the layer microhardness at voltages less than 10.5 V.