OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 26 No. 3 2024 Wear resistance and corrosion behavior of Cu-Ti coatings in SBF solution Alexander Burkov а, Maxim Dvornik b, Maria Kulik c, *, Alexandra Bytsura d Khabarovsk Federal Research Center FEB RAS, 153 Tihookeanskaya st., Khabarovsk, 680042, Russian Federation a https://orcid.org/0000-0002-5636-4669, burkovalex@mail.ru; b https://orcid.org/0000-0002-1216-4438, maxxxx80@mail.ru; c https://orcid.org/0000-0002-4857-1887, marijka80@mail.ru; d https://orcid.org/0009-0005-4750-7970, alex_btsr@mail.ru Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2024 vol. 26 no. 3 pp. 234–249 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2024-26.3-234-249 ART I CLE I NFO Article history: Received: 20 May 2024 Revised: 22 June 2024 Accepted: 08 July 2024 Available online: 15 September 2024 Keywords: Cu-Ti coating Electrospark deposition SBF solution Coefficient of friction Corrosion Wear Funding The work was supported by the Russian Science Foundation grant No. 23-23-00032. ABSTRACT Introduction. Currently, titanium and its alloys have become the most popular metal implantable biomaterials. However, the main disadvantage of titanium alloys is low wear resistance due to high viscosity. It is known that copper-titanium coatings effectively improve the antibacterial properties of titanium alloy and at the same time increase its wear resistance. Purpose of the work is to study the effects of a solution simulating body fluid on corrosion properties, friction coefficient and the wear of copper-titanium coatings obtained by electrospark deposition method of the Ti-6Al-4V alloy. Method. A non-localized electrode consisting of copper and titanium granules in various ratios was used to form copper-titanium coatings on a titanium alloy by electrospark deposition. The structure of the coatings was examined using a DRON-7 X-ray diffractometer in Cu-Kα radiation and an X-max 80 energy dispersive spectrometer. The antibacterial activity of the deposited Cu-Ti coatings was studied on a non-pathogenic gramnegative culture of Escherichia coli. Polarization tests in SBF solution were carried out using a P-40X potentiostat with an impedance measurement module. The metal content in the SBF solution after immersion of the samples was measured using an ICP-MS 2000 mass spectrometer. The tribological characteristics of the coatings according to the ASTM G99-17 standard using the “ball-on-disk” scheme with sliding friction in the SBF solution at loads of 10 and 25 N were examined. Results and discussions. It is shown that the bactericidal activity of Cu-Ti coated samples to a non-pathogenic culture of Escherichia coli increased monotonously with an increase in copper content. With copper concentration increasing, the corrosion current density of the coatings increased from 3.455 to 17.570 μA/cm2. It is shown that the SBF solution accelerates the wear of a titanium alloy many times over due to its interaction with the electrolyte via the oxidative wear mechanism. The use of Cu-Ti coatings allows reducing the friction coefficient and greatly decreasing the wear of Ti-6Al-4V alloy in the presence of an electrolyte. For citation: Burkov A.A., Dvornik M.A., Kulik M.A., Bytsura A.Yu. Wear resistance and corrosion behavior of Cu-Ti coatings in SBF solution. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2024, vol. 26, no. 3, pp. 234– 249. DOI: 10.17212/1994-6309-2024-26.3-234-249. (In Russian). ______ * Corresponding author Kulik Maria A., Junior Researcher Khabarovsk Federal Research Center FEB RAS, 153 Tihookeanskaya st., 680042, Khabarovsk, Russian Federation Tel.: +7 4212 22-69-56, e-mail: marijka@mail.ru Introduction Titanium and titanium alloys are used in many sectors of the national economy due to its outstanding mechanical properties (high strength, low density) and corrosion resistance [1]. Currently, titanium and its alloys have become more popular metal implantable biomaterials, compared to stainless steels and cobalt alloys, due to its better mechanical properties, high corrosion resistance and biocompatibility [2]. Titanium alloys are primarily used for orthopedic and dental implants. The failure rate of titanium implants is known to be 5–10 % over 15 years [3]. Bioinertness is one of the main reasons for poor osseointegration of titanium alloys. Therefore, for the successful use of titanium alloys in dentures or artificial joints, some obstacles still need to be overcome.
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