Determination of influence of electrolyte composition and impurities on the content of -AL2O3 phase in MАO-coatings on aluminum

Authors

  • Valeria Subbotinа National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002, Ukraine https://orcid.org/0000-0002-3882-0368
  • Ubeidulla F. Al-Qawabeha Al-Zaytoonah University Queen Alia Airport str., 594, Amman, Jordan, 11733, Jordan
  • 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
  • Alexander Subbotin National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002, Ukraine https://orcid.org/0000-0002-9422-4480
  • 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

DOI:

https://doi.org/10.15587/1729-4061.2019.185674

Keywords:

microarc oxidation, anodic-cathodic mode, electrolyte composition, alloying, phase composition, corundum

Abstract

Coatings with a thickness of about 100 μm were obtained by microarc oxidation of technically pure aluminum and aluminum alloyed with copper and zinc in an alkaline silicate electrolyte at a current density of ~20 A/dm2. The results of studying the surface morphology, phase composition, and hardness of MAO coatings are presented. The change parameters were the electrolyte composition and the concentration of alloying (Cu and Zn) elements. This study was carried out because the currently available data are not enough to understand the nature of the influence of the chemical composition of the aluminum alloy and electrolysis conditions (in particular, electrolyte composition) on the mechanism and kinetics of γ→α transformation. Without understanding this, a directed change in the structural state and properties of MAO coatings becomes impossible. As a result of the studies, it was found that during microarc oxidation of aluminum alloys in an alkaline electrolyte with the addition of liquid glass (Na2SiO3) of various concentrations, the strengthened layer consists of oxides α-A12O3, γ-A12O3 and mullite 3Al2O3·2SiO2. The data of x-ray diffraction analysis of the coatings indicate the crystal structure of the coatings. It was established that aluminum alloying with copper and zinc significantly affects the phase composition of the coating, changing the quantitative ratio of the phases in a nonlinear manner. The highest content of the α-A12O3 phase (up to 60 vol. %) is achieved by Cu doping. The highest hardness of MAO coatings is achieved using an electrolyte with a composition of 1 g/l KOH and 6 g/l Na2SiO3 in aluminum alloys with a copper content of more than 3 %, and zinc – 2–3 %. It is established that the mechanism of formation of the phase composition should be associated with stabilization and destabilization of the γ-A12O3 phase. Therefore, to achieve high hardness, it is necessary to choose those alloying elements that affect the destabilization of γ-A12O3, which ensures the formation of the α-A12O3 phase (corundum). In this regard, it was revealed that Cu2+ cations contribute to the destabilization of the γ-А12О3 phase, and Zn2+ cations lead to stabilization of the γ-А12О3 phase at a Zn content >3 %

Author Biographies

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

PhD, Associate 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

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 Physical and Mathematical Sciences, Professor

Department of Materials Science

Alexander Subbotin, National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002

Researcher

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, 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

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Published

2019-12-03

How to Cite

Subbotinа V., Al-Qawabeha, U. F., Belozerov, V., Sоbоl O., Subbotin, A., Tabaza, T. A., & Al-Qawabah, S. M. (2019). Determination of influence of electrolyte composition and impurities on the content of -AL2O3 phase in MАO-coatings on aluminum. Eastern-European Journal of Enterprise Technologies, 6(12 (102), 6–13. https://doi.org/10.15587/1729-4061.2019.185674

Issue

Vol. 6 No. 12 (102) (2019): Materials Science

Section

Materials Science

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Copyright (c) 2019 Valeria Subbotinа, Ubeidulla F. Al-Qawabeha, Valery Belozerov, Oleg Sоbоl, Alexander Subbotin, Taha A. Tabaza, Safwan Moh`d Al-Qawabah

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