Effect of electrolysis regimes on the structure and properties of coatings on aluminum alloys formed by anode­cathode micro arc oxidation

Authors

  • Valery Belozerov National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002, Ukraine https://orcid.org/0000-0002-7623-3658
  • Oleg Sоbоl National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002, Ukraine https://orcid.org/0000-0002-4497-4419
  • Anna Mahatilova National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002, Ukraine https://orcid.org/0000-0001-7146-7087
  • Valeria Subbotinа National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002, Ukraine https://orcid.org/0000-0002-3882-0368
  • Taha A. Tabaza Al-Zaytoonah University Queen Alia Airport str., 594, Amman, Jordan, 11733, Jordan
  • Ubeidulla F. Al-Qawabeha Tafila Technical University P O Box, 179, Tafila, Jordan, 66110, Jordan
  • Safwan M. Al-Qawabah Al-Zaytoonah University Queen Alia Airport str., 594, Amman, Jordan, 11733, Jordan

DOI:

https://doi.org/10.15587/1729-4061.2018.121744

Keywords:

structural engineering, anode-cathode regime, coating thickness, phase composition, corundum, properties

Abstract

The study provides research findings on the effect of current regimes in microplasma oxidation on the phase composition and the properties of oxide coatings on an aluminum alloy. To obtain oxide coatings, micro arc (microplasma) oxidation is carried out in an alkaline-silicate electrolyte with an alternating sinusoidal current and in a pulsed current mode. It has been shown that an increased density of microdischarges in the case of the pulse technology increases the total energy released in them. This produces an increase in the growth rate of the oxide coating and the probability of formation of the α-Al2O3 phase. A linear dependence of the thickness of the coating on the duration of the process time and, accordingly, on the amount of transmitted electricity has been established. It has been found that for a small thickness of the oxide layer, the high rate of heat transfer both to the metal and to the electrolyte promotes the formation of aluminum oxide in the form of the γ-Al2O3 phase. The energy concentration in a thick oxide layer causes the formation of a high-temperature modification of α-Al2O3. It has been shown that the mechanism for the formation of α-Al2O3 is determined by the action of two facts: the difference in the energies of the γ-Al2O3 and α-Al2O3 phases as well as the polymorphic high-temperature transformation of γ-Al2O3→α-Al2O3 in the high-temperature region of a micro arc discharge.

The coatings obtained by microplasma oxidation in the pulsed current mode have high hardness (23 GPa) and electrical strength (20 V/μm)

Author Biographies

Valery Belozerov, National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002

PhD, Professor

Department of Materials Science

Oleg Sоbоl, National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002

Doctor of Physics and Mathematics Sciences, Professor

Department of Materials Science

Anna Mahatilova, National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002

PhD, Senior Researcher

Department of Materials Science

Valeria Subbotinа, National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002

PhD, Associate Professor

Department of Materials Science

Taha A. Tabaza, Al-Zaytoonah University Queen Alia Airport str., 594, Amman, Jordan, 11733

PhD, Associate Professor

Department of Mechanical Engineering

Ubeidulla F. Al-Qawabeha, Tafila Technical University P O Box, 179, Tafila, Jordan, 66110

PhD, Associate Professor

Department of Mechanical Engineering

Safwan M. Al-Qawabah, Al-Zaytoonah University Queen Alia Airport str., 594, Amman, Jordan, 11733

PhD, Associate Professor

Department of Mechanical Engineering

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Published

2018-01-26

How to Cite

Belozerov, V., Sоbоl O., Mahatilova, A., Subbotinа V., Tabaza, T. A., Al-Qawabeha, U. F., & Al-Qawabah, S. M. (2018). Effect of electrolysis regimes on the structure and properties of coatings on aluminum alloys formed by anode­cathode micro arc oxidation. Eastern-European Journal of Enterprise Technologies, 1(12 (91), 43–47. https://doi.org/10.15587/1729-4061.2018.121744

Issue

Vol. 1 No. 12 (91) (2018): Materials Science

Section

Materials Science

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Copyright (c) 2018 Valery Belozerov, Oleg Sоbоl, Anna Mahatilova, Valeria Subbotinа, Taha A. Tabaza, Ubeidulla F. Al-Qawabeha, Safwan M. Al-Qawabah

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