Scholarly record
NANOSTRUCTURED CONVERSION COATINGS ON ALUMINUM ALLOYS FOR ECOLOGIC CATALYSIS
Abstract
The process of mixed oxide coatings forming on a high-silicon aluminum alloy in the cobalt-containing pyrophosphate electrolyte by the plasma-electrolytic oxidizing (PEO) method is studied. It was shown that AL25 chemical composition heterogeneity causes the consumption of part of the anode current to homogenize the treated surface, which is reflected in minimizing the content of doping components at the initial processing stage. It was established the growth of mixed oxides Al2O3·CoxOy relative mass to be a function of time with a maximum at 55 minutes. The chemical, phase composition and surface morphology of the formed oxide layer depend on the oxidizing time. The catalytic component content in the surface oxides varies from 0.2 to 23.3 at.% with an increase in processing time of 10 to 60 minutes. Maximum cobalt incorporation into the oxide layer occurs at PEO of 35-50 minutes, while the silicon content in the surface layers does not exceed 2 at.%, which is favorable for the catalytic properties. The cobalt oxide, preliminary Co3O4, incorporation in alumina ?-Al2O3 matrix is visualized by the blue-violet color steroidal surface structures in the sites of micro-arc discharges. The mixed alumina and cobalt oxides layer are characterized by a developed micro globular surface consists of conglomerate spheroids with an average size of 1?2 microns. There are some amorphous phases in the structure of mixed oxides due to non-equilibrium PEO conditions. The set of detected factors is a prerequisite for the high catalytic properties of oxide coatings. A promising field of Al2O3·CoxOy systems application is an intra-cylinder catalysis in the internal combustion engines.
Publication Impact Profile
Publication details
References15
Belyaev, D. V., Mussabek, G., Sagyndykov, A. et.al. Modern state of composite coatings formation problem // 17th Int.l Multidisc. Sc Geoconf. SGEM 2017. 17 (61), 2017, Pp 233-240. 130800Fan
Ved’, M., Sakhnenko, N., Yermolenko, I. Composition and corrosion behavior of iron-cobalt-tungsten.// Eurasian Chemico-Technological Journal. Vol.20, №3.- Pp. 145-152. (2018).
Muradov, A.D., Korobova, N.E., Kyrykbaeva, A.A. Influence of γ-Irradiation on the Optical Properties of the Polyimide–YBa2Cu3O6.7 System. Journal of Applied Spectroscopy. V.85, N2.- Pp.260-266. 2018.
Yar-Mukhamedova, G., Sakhnenko. Nano-composition Ti-Co(Mn) coatings investigation. // 18th Int.l Multidisc. Sc Geoconf. SGEM 2018. 18 (62), 2018 Pp 233-240.
Darisheva A., Kasimzhanov K. Physicochemical Investigations of Scheelite Concentrate Decomposition // Eurasian Chemico-Technological Journal, № 17, p. 209–212, 2015.
Muradov A., Korobova N. Impact of silver metallization and electron irradiation on the mechanical deformation of polyimide films //Technical Physics, Vol. 62, No. 11, pp. 1675–1678. 2017.
Ved, M.V., Karakurkchi, A.V., Sakhnenko, N.D.et al. Mixed alumina and cobalt containing plasma electrolytic oxide coatings // IOP Conference Series: Materials Science and Engineering. 2017.
Ved, M., Sakhnenko, N., Koziar, M. et al. Ternary cobalt-molybdenum-zirconium coatings for alternative energies. Applied Surface Science. 2017. -Vol. 384, № 17.- P. 56–65.
Yar-Mukhamedova, G.Sh. Investigation of corrosion resistance of metallic composite thin-film systems before and after thermal treatment by the "corrodkote" method // Materials Science. Vol.37, №1. - Pp.140-143. 2001.
Komarov Ph. , Ismailova G., Effect of thermal processing on the structure and optical properties of crystalline silicon with GaSb nanocrystals //Technical Physics. V. 60, N 9, P. 1348-1352 (2015).
Muradov, A., Mukashev, K., Ismailova, G., et al. Mathematical model of composite materials formation. // 17-th Int. Multid. Sc Geo-Conf & EXPO SGEM.- Albena, 2017. – P.117-124.
Yar-Mukhamedova G., Ved’ M., Sakhnenko N., Nenastina T., Electrodeposition and properties of binary and ternary cobalt alloys with molybdenum and tungsten, Applied Surface Science, Netherlands, vol. 445, pp. 298-307, 2018.
Aldabergenova, T.M., Kislitsin, S.B. et al. Effect of low-energy alpha-particles irradiation on surface structure and physical-mechanical properties of high-purity tungsten // AIP Conference Proceedings. 2016.
Yar-Mukhamedova, G.Sh. Internal adsorption of admixtures in precipitates of metals // Materials Science. Vol.35(4), p.599-600. 1999.
Sagyndykov, A.B., Kalkozova, Z.K. Fabrication of nanostructured silicon surface using selective chemical etching. // Technical Physics. 62(11), pp. 1692–1697 (2017).
View or Download full articleAccess options
SWS access login
Login as SWS Scientific CommitteeLogin as SWS Scientific PartnerLogin as SWS AuthorAuthors and approved SWS contributors will read and export their own linked papers after identity matching by SWS profile, email and SGEM GlobalID.
For librarian assistance: [email protected]
Purchase Instant Access
- Article can be downloaded after successful payment.
- Article may be used according to SWS library access terms.
- Article cannot be redistributed.
