Abstract
The aim of this work was to establish the influence of the thickness of the anodic coatings on their mechanical properties and to understand the relation between their hardness and the abrasion resistance. The coatings were produced in the hard anodizing process onto the 6061-T6 aluminum alloy. Their thickness was in the range between 19 and 43 µm. The abrasion resistance was determined by using Taber abrasion test. The weight losses of the coatings obtained were in the range between 15 and 11 mg and decreased with their increasing thickness. It has been shown that the hardness measured on the cross sections of the coatings did not correspond to their abrasion resistance. Thus, the new approach has been proposed. The hardness of the coatings was estimated on the basis of the results of the scratch test performed at the constant load. The results obtained correspond to the abrasion resistance of the coatings.
Highlights
Anodic coatings are produced onto the surface of various components, made of aluminum alloys, in order to enhance their surface properties
The hardness is inversely proportional to the depth of penetration of the stylus during the scratch test performed at the constant load
The results obtained correspond to the abrasion resistance of the coating, contrary to the results of the hardness test obtained on the cross sections of the coatings
Summary
Anodic coatings are produced onto the surface of various components, made of aluminum alloys, in order to enhance their surface properties. The anodic coatings are formed in the electrolytic process. Their thickness should be proportional to the electrical charge passing the electrolytic cell. The rate of dissolution of the anodic coating is dependent on the chemical composition of the electrolyte and its temperature. The characteristic features of the hard anodizing are low temperature of the bath (around 273 K) and high current density (Ref [2, 3]). The former ensures that the rate of dissolution of the coating is low. It is frequently observed that the thickness of the hard coatings depends linearly on the time of anodizing (Eq 1): Przemysław
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