An experimental analysis of the influence of electrolyte compositions, current density and duration of the micro­arc oxidation process on the structural­phase state and properties of VT3­1 titanium alloy

Authors

DOI:

https://doi.org/10.15587/1729-4061.2020.214308

Keywords:

micro-arc oxidation, VT3-1, electrolyte type, growth kinetics, phase composition, wear resistance

Abstract

It was determined that in an electrolyte containing 1.75 g/L KOH+1 g/L Na2SiO3+2 g/L NaAlO2, with an increase in current density from 15 A/dm2 to 50 A/dm2, the phase composition of the coating changes. In the three-phase state (aluminum titanate, rutile, and amorphous-like phase), with increasing j, instead of an amorphous-like phase, a crystalline mullite phase appears. The hardness of the coating increases from 5400 MPa to 12500 MPa. It was found that, in combination with aluminum titanate, mullite is the basis for achieving high hardness in the coating. The formation of a ceramic micro-arc oxide coating on the surface of the VT3-1 titanium alloy makes it possible to reduce the dry friction coefficient by more than 5 times to f=0.09.

The effect of electrolysis conditions during micro-arc oxidation of the VT3-1 alloy (titanium-based) on the growth kinetics, surface morphology, phase-structural state, and physical and mechanical characteristics (hardness, coefficient of friction) of oxide coatings was studied. It was found that the process in the mode of micro-arc discharges is stably implemented on the VT3-1 alloy in an alkaline (KOH) electrolyte with additions of sodium aluminate (NaAlO2) and liquid glass (Na2SiO3). This makes it possible to obtain coatings up to 250 μm thick. In this case, a linear dependence of the coating thickness on the time of the MAO process is observed. The growth rate of the coating increases with increasing current density. The highest growth rate was 1.13 μm/min. It was revealed that in an electrolyte containing 1 g/L KOH+14 g/L NaAlO2 with an increase in the duration of oxidation from 60 to 180 minutes, the relative content of the high-temperature phase, rutile, increases. In the coatings obtained in the electrolyte 1.75 g/L KOH+1 g/L Na2SiO3+2 g/L NaAlO2, with an increase in the duration of the MAO process, the relative content of the amorphous-like phase decreases and the content of the crystalline phase of mullite (3Al2O3·2SiO2) increases

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

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

Postgraduate Student

Department of Materials Science

Oleksandr Smyrnov, Hon. Prof. M. S. Bokarius Kharkiv Research Institute of Forensic Examinations Zolochivska, str., 8a, Kharkiv, Ukraine, 61177

PhD, Leading Researcher

Forensic Laboratory

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2020-10-31

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Subbotinа V., Sоbоl O., Belozerov, V., Shnayder, V., & Smyrnov, O. (2020). An experimental analysis of the influence of electrolyte compositions, current density and duration of the micro­arc oxidation process on the structural­phase state and properties of VT3­1 titanium alloy. Eastern-European Journal of Enterprise Technologies, 5(12 (107), 6–15. https://doi.org/10.15587/1729-4061.2020.214308

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Vol. 5 No. 12 (107) (2020): Materials Science

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Materials Science

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Copyright (c) 2020 Valeria Subbotinа, Oleg Sоbоl, Valery Belozerov, Valentin Shnayder, Oleksandr Smyrnov

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