A study of the electrolyte composition influence on the structure and properties of MAO coatings formed on AMg6 alloy

Authors

  • Valeria Subbotinа National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002, Ukraine https://orcid.org/0000-0002-3882-0368
  • Oleg Sоbоl National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002, Ukraine https://orcid.org/0000-0002-4497-4419
  • Valery Belozerov National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002, Ukraine https://orcid.org/0000-0002-7623-3658
  • Ubeidulla F. Al-Qawabeha Al-Zaytoonah University Queen Alia Airport str., 594, Amman, Jordan, 11733, Jordan
  • Taha A. Tabaza Al-Zaytoonah University Queen Alia Airport str., 594, Amman, Jordan, 11733, Jordan
  • Safwan Moh`d Al-Qawabah Al-Zaytoonah University Queen Alia Airport str., 594, Amman, Jordan, 11733, Jordan
  • Valentin Shnayder National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002, Ukraine https://orcid.org/0000-0002-2544-4471

DOI:

https://doi.org/10.15587/1729-4061.2020.205474

Keywords:

microarc oxidation, alkaline electrolyte, silicate electrolyte, complex electrolyte, phase composition, electric strength

Abstract

The influence of electrolysis conditions at different electrolyte compositions on the phase formation and properties of coatings obtained by microarc oxidation (MAO) on an aluminum alloy AMg6 was studied. For electrolysis, three types of electrolytes were used: alkaline electrolyte ((KOH) solution in distilled water), silicate electrolyte (with different percentages of Na2SiO3 component) and complex alkaline silicate electrolyte with liquid glass (1÷12 g/l Na2SiO3) and potassium hydroxide (1÷6 g/l KOH). An analysis of the results showed that the choice of electrolyte type and conditions of the microarc oxidation process allows a wide variation in the phase-structural state, thickness and properties of the AMg6 aluminum alloy. The criterion for the expected phase-structural state of the coatings as a result of microarc oxidation is the completeness of the γ–Al2O3→α–Al2O3 transformation process during coating formation. The use of an alkaline electrolyte does not allow achieving a high hardness of the coating due to the formation of the γ-Al2O3 phase and the absence of thermodynamic conditions for the γ–Al2O3→α–Al2O3 transition. When using a silicate electrolyte, it is possible to significantly increase the growth rate of the coating, but at the same time, the presence of a large specific Si concentration stimulates the formation of mullite and an amorphous-like phase. The use of a combined alkaline silicate electrolyte (with different percentages of KOH+Na2SiO3) with a low content (6 g/l) of Na2SiO3 in solution stimulates the formation of mullite. This is manifested to the greatest extent with the lowest content (1 g/l) of the KOH component. At a higher content (2 g/l) of the KOH component, the processes characteristic of an alkaline electrolyte become dominant. This leads to an incomplete transformation reaction and the formation of only the γ-Al2O3 phase. The achievement of the thermodynamic conditions of the γ–Al2O3→α–Al2O3 conversion became possible with an increase in the specific Na2SiO3 content in the electrolyte solution to 12 g/l. In this case, MAO coatings were formed on the AMg6 alloy with the highest hardness of 1500 kg/mm2 and high electric strength of 12 V/μm

Author Biographies

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

PhD, Associate Professor

Department of Materials Science

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

Doctor of Physical and Mathematical Sciences, Professor

Department of Materials Science

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

PhD, Professor

Department of Materials Science

Ubeidulla F. Al-Qawabeha, Al-Zaytoonah University Queen Alia Airport str., 594, Amman, Jordan, 11733

PhD, Associate Professor

Department of Mechanical Engineering, Faculty of Engineering

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

PhD, Associate Professor

Department of Mechanical Engineering, Faculty of Engineering

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

PhD, Associate Professor, Dean - Faculty of Engineering and Technology

Department of Mechanical Engineering, Faculty of Engineering

Valentin Shnayder, National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002

Postgraduate Student

Department of Materials Science

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2020-06-30

How to Cite

Subbotinа V., Sоbоl O., Belozerov, V., Al-Qawabeha, U. F., Tabaza, T. A., Al-Qawabah, S. M., & Shnayder, V. (2020). A study of the electrolyte composition influence on the structure and properties of MAO coatings formed on AMg6 alloy. Eastern-European Journal of Enterprise Technologies, 3(12 (105), 6–14. https://doi.org/10.15587/1729-4061.2020.205474

Issue

Vol. 3 No. 12 (105) (2020): Materials Science

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Materials Science

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Copyright (c) 2020 Valeria Subbotinа, Oleg Sоbоl, Valery Belozerov, Ubeidulla F. Al-Qawabeha, Taha A. Tabaza, Safwan Moh`d Al-Qawabah, Valentin Shnayder

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