THE INFLUENCE OF THE ADDITION OF SiO2 NANO-DIMENSIONAL PARTICLES TO THE ELECTROLYTE ON THE COMPOSITION AND PROPERTIES OF THE OXIDE LAYERS FORMED BY THE PLASMA-ELECTROLYTIC OXIDATION ON MAGNESIUM


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Abstract

Magnesium and its alloys, due to the combination of lightness and strength characteristics, are of interest in all production industries particular about the weight of products - shipbuilding, aviation, rocketry. However, the surface properties of magnesium alloys fail to meet many requirements, and at the moment, there is no the effective method for their improvement. The electrochemical method of plasma electrolytic oxidation (PEO) is promising in this case but the technology of obtaining the oxide layers using this method needs to be improved. One of the ways of modifying the PEO layers is the addition of nanoparticles to the electrolyte. The paper describes the synthesizing of the oxide layers on the pure magnesium by the PEO method using the electrolyte without nanoparticles and with the addition of SiO2 nanoparticles to the electrolyte. The authors studied the obtained oxide layers using the methods of scanning electron microscopy, X-ray spectral microanalysis, X-ray phase analysis, instrumental indentation, and the electrochemical tests. The structure, element and phase composition, adhesion strength to the substrate and the corrosion resistance of the oxide layers on magnesium were studied.
The study demonstrated the positive effect of the SiO2 nanoparticles additions to the electrolyte on the functional properties of the oxide layer - the adhesion strength to the substrate and corrosion resistance. The mechanism of the positive effect of nanoparticles on these characteristics was suggested. The study detected the phase of magnesium silicate Mg2SiO4, as well as magnesium phosphate Mg3(PO4)2 in the oxide layer which indicates the participation of both the electrolyte components - phosphorus, and the added nanosized particles of silicon dioxide in the formation of the layer.

About the authors

E. D. Borgardt

Togliatti State University

Author for correspondence.
Email: euletech13@gmail.com

Borgardt Evgeny Dmitrievich - junior researcher of the Research Division No. 4 of the Research Institute of Advanced Technologies.
445020, Togliatti, Belorusskaya Street, 14.

Россия

A. V. Polunin

Togliatti State University

Email: Anpol86@gmail.com

Polunin Anton Viktorovich - PhD (Engineering), senior researcher of the Research Division No. 4 of the Research Institute of Advanced Technologies.
445020, Togliatti, Belorusskaya Street, 14.

Россия

P. V. Ivashin

Togliatti State University

Email: ivashinpv@gmail.com

Ivashin Pavel Valentinovich - PhD (Engineering), leading researcher of the Research Division No. 4 of the Research Institute of Advanced Technologies.
445020, Togliatti, Belorusskaya Street, 14.

Россия

M. M. Krishtal

Togliatti State University

Email: krishtal@tltsu.ru

Krishtal Mikhail Mikhailovich - Doctor of Sciences (Physics and Mathematics), Professor, Rector.
445020, Togliatti, Belorusskaya Street, 14.

Россия

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