Abstract
Purpose: Analysis of the influence of microarc oxidation modes on the properties and surface morphology of MAO coatings applied to aluminum alloy samples.
Material and methodology: The studies were carried out on samples of 1163 alloy clad with aluminum. In the study, the following parameters of microarc oxidation were changed: the rate of slow voltage growth, the period of slow voltage growth. After applying the oxide coating, the surface morphology and hardness of the coatings were investigated.
Findings: With a decrease in the rate of growth of the voltage at the anode electrode, it establishes a stable state with a slower rate of rise of potential and current, which causes a rapid accumulation of charge on the electrode surface and leads to an earlier onset of polarization. Under the condition of a steady rate of increase in the anode potential on the surface of the anode electrode, the effect of the rate of voltage rise on the polarization of the anode electrode is proportional to the rate of this increase. The morphology of the coating surface obtained at the first stage of oxidation affects the formation of the base of the future MAO coating and may be uneven. At the second stage, accumulated potential of the electric field leads to micro explosions in the breakdown channels, which contributes to the formation of a splash-like relief.
Originality: Based on obtaining new information on the effect of electric modes of microarc oxidation on the surface morphology of an aluminum alloy.
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The study was carried out using the equipment of the Center for Collective Use “New Materials and Technologies” on the basis of KnASU.
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Bashkov, O.V., Bao, F., Li, X., Bashkova, T.I. (2021). Investigation of the Influence of Electrical Modes on the Morphology and Properties of Oxide Coatings on Aluminum Alloy 1163, Obtained by the Microarc Oxidation. In: Shakirova, O.G., Bashkov, O.V., Khusainov, A.A. (eds) Current Problems and Ways of Industry Development: Equipment and Technologies. Lecture Notes in Networks and Systems, vol 200. Springer, Cham. https://doi.org/10.1007/978-3-030-69421-0_10
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