Study of the influence of oxidizing parameters on the composition and morphology of Al2O3•CoOx coatings on AL25 alloy

Authors

DOI:

https://doi.org/10.15587/1729-4061.2018.128457

Keywords:

piston silumin, AL25, plasma-electrolytic oxidation, oxide coating, surface morphology

Abstract

The influence of operating parameters of plasma-electrolytic oxidation in diphosphate cobalt-containing electrolyte on the process of formation of oxide coatings on alumosilicon alloy AL25 (GOST 1583) was studied. It was shown that inclusion of cobalt into the composition of surface oxide layers leads to a change of morphology and topography of the surface. Variation of current density and PEO time allows flexible control of the process of incorporation of the catalytic component into the matrix of oxide of basic metal. It was shown that at an increase in oxidation time, cobalt content in the surface oxide layer increases.

The rational mode of plasma-electrolytic treatment of piston alloy in diphosphate electrolyte for obtaining oxide coatings, enriched with cobalt, was substantiated. It is advisable to perform formation of PEO-coatings on AL25 with developed globular-mosaic surface, maximum cobalt content, with minimizing impurities in the range of current densities of 3–5 A/dm2 within 20–40 min. The obtained cobalt-containing oxide coatings can be used in the air and water purification systems, specifically, for intracylinder catalysis of gas emissions of internal combustion engines.

Author Biographies

Ann Karakurkchi, National Technical University «Kharkіv Polytechnic Institute» Kyrpychova str., 2, Kharkiv, Ukraine, 61002

PhD, Senior Researcher

Department of General and Inorganic Chemistry

Mykola Sakhnenko, National Technical University «Kharkіv Polytechnic Institute» Kyrpychova str., 2, Kharkiv, Ukraine, 61002

Doctor of Technical Sciences, Professor, Head of Department

Department of Physical Chemistry

Maryna Ved', National Technical University «Kharkіv Polytechnic Institute» Kyrpychova str., 2, Kharkiv, Ukraine, 61002

Doctor of Technical Sciences, Professor

Department of General and Inorganic Chemistry

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Published

2018-04-11

How to Cite

Karakurkchi, A., Sakhnenko, M., & Ved’, M. (2018). Study of the influence of oxidizing parameters on the composition and morphology of Al2O3•CoOx coatings on AL25 alloy. Eastern-European Journal of Enterprise Technologies, 2(12 (92), 11–19. https://doi.org/10.15587/1729-4061.2018.128457

Issue

Vol. 2 No. 12 (92) (2018): Materials Science

Section

Materials Science

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Copyright (c) 2018 Ann Karakurkchi, Mykola Sakhnenko, Maryna Ved'

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