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COMPOSITES AND MULTIPURPOSE COATINGS
Название Corrosion resistance of oxide layers formed by micro-arc oxidation on hypereutectic aluminum alloy
DOI 10.17580/tsm.2023.10.07
Автор Dudareva N. Yu., Kolomeychenko A. V., Deev V. B., Sitdikov V. M.
Информация об авторе

Ufa University of Science and Technology, Ufa, Russia

N. Yu. Dudareva, Associate Professor, Professor at the Department of Internal Combustion Engines, Doctor of Technical Sciences, e-mail: dudareva.nyu@ugatu.su

V. M. Sitdikov, Head of the Educational Department – Deputy Head of the Department of Aircraft, Helicopters and Aircraft Engines of the Military Training Center, e-mail: ven_80@mail.ru

 

Central Scientific Research Automobile and Automotive Engines Institute NAMI, Moscow, Russia
A. V. Kolomeychenko, Professor, Head of the Innovative Technology Department, Centre for Agricultural Engineering, Doctor of Technical Sciences, e-mail: a.kolomiychenko@nami.ru

 

Wuhan Textile University, Wuhan, China1 ; Vladimir State University named after Alexander and Nikolay Stoletovs, Vladimir, Russia2 ; National University of Science and Technology MISiS, Moscow, Russia3
V. B. Deev*, Professor of the Faculty of Mechanical Engineering and Automation1, Chief Researcher2, Professor of the Department of Metal Forming3, Doctor of Technical Sciences, Professor, e-mail: deev.vb@mail.ru


*Corresponding Author

Реферат

Oxide surface layers formed by micro-arc oxidation are usually considered to be quite corrosion resistant. However, the properties of these layers are significantly influenced by process factors. This paper describes a study that looked at the relationship between the concentration of sodium metasilicate (Na2SiO3) in the electrolyte and the corrosion resistance of samples. All experiments were carried out with samples of a hype reutectic aluminum alloy containing Si 24–26%(wt.) (AlSi26CuNiMg – M244 grade according to the Mahle standard), as the properties of oxide layers on this alloy are poorly studied. Scanning electron microscope photographs of cross sections were analyzed to determine the thickness and structure of the oxide layer. For porosity studies, images of cross sections were analyzed with the help of the ImageJ programme. The corrosion resistance of the samples was analyzed based on the mass rate of corrosion. For this, samples with an oxide layer were kept in a corrosive solution of special composition for 144 hours. Similar tests were carried out for samples without an oxide layer. It was found that the concentration of sodium metasilicate in the electrolyte has almost no effect on the electrical parameters of micro-arc oxidation, the thickness of the formed layer or its corrosion rate. Micro-arc oxidation of the surface of M244 alloy samples helps raise their corrosion resistance by about 4 times. It is assumed that the corrosion rate of the samples is associated with the presence of open pores, through cracks and pseudo-closed pores, which look closed in the SEM image but in reality are open. An increase in the amount of sodium metasilicate in the electrolyte results in a higher closed porosity of the MAO layer without changing the through porosity.
This research was carried out under a scientific research assignment given by the Ministry of Science and Higher Education of the Russian Federation; Subject: FZUN-2020-0015, assigned to the Vladimir State University.

Ключевые слова Micro-arc oxidation, aluminium alloys, coating, electrolyte, porosity, thickness, corrosion resistance
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