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COMPOSITES AND MULTIPURPOSE COATINGS
Название Oleate-containing biocompatible coatings for protection of biodegradable magnesium implants
DOI 10.17580/tsm.2023.09.04
Автор Gnedenkov A. S., Sinebryukhov S. L., Filonina V. S., Gnedenkov S. V.
Информация об авторе

Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, Russia:

A. S. Gnedenkov, Lead Researcher1, Professor of the Russian Academy of Sciences, Doctor of Сhemical Sciences, e-mail: asg17@mail.com
S. L. Sinebryukhov, Deputy Director Responsible for Research, Corresponding Member of the Russian Academy of Sciences, Doctor of Сhemical Sciences, Associate Professor, e-mail: sls@ich.dvo.ru
V. S. Filonina, Junior Researcher, e-mail: filonina.vs@gmail.com
S. V. Gnedenkov, Director, Corresponding Member of the Russian Academy of Sciences, Doctor of Сhemical Sciences, Professor, e-mail: svg21@hotmail.com

Реферат

A variety of inhibitor-polymer-containing hybrid coatings were formed on the bioresorbable magnesium alloy MA8 (Mg – Mn – Ce system) in order to reduce the rate of material degradation due to a prolonged action function of active anticorrosion protection. A ceramic-like coating was produced by plasma electrolytic oxidation (PEO), which serves as a protective matrix for subsequent functionalization. The authors selected and optimized a technique providing the most efficient impregnation of the PEO layer with sodium oleate (NaOL), which at the same time helps to reduce the rate of its release from the coating due to surface treatment with a bioresorbable polymer material, i. e. polycaprolactone (PCL). The paper describes a number of hybrid coating production techniques, which are based on sequential impregnation of the base PEO layer with various concentrations of sodium oleate and PCL and on single-stage deposition of an inhibitor and a polymer from the solution. The chemical composition of the inhibitor-containing layers was determined, and the distribution of the inhibitor over the surface of the PEO coating is shown. The level of corrosion protection of the alloy was established by conducting electrochemical and volumetric tests in physiological solutions (0.9% NaCl solution, Hanks’ solution). Hybrid coatings obtained by sequential impregnation of the base PEO layer with an inhibitor and a polymer are shown to have the best corrosion resistance among the studied protective layers. Oleate-containing surface layers are characterized with a stable corrosion behaviour during 7 days of soaking in the aggressive medium. A relationship was established between the composition and properties of coa tings formed on magnesium alloys. The application of hybrid anticorrosion PEO coatings is expected to ensure the required level and duration of the corrosion protection for controlled resorption of biomedical magnesium alloy implants.

The funding for the production of biocompatible coating was provided under a Russian Science Foundation grant (Project No. 21-73-10148); the studies of the composition, corrosion rate of the material (volumetry) and its electrochemical properties were funded under a Russian Science Foundation grant (Project No. 20-13-00130).

Ключевые слова Magnesium alloy, physiological solution, hybrid coatings, corrosion rate, electrochemical methods, protective properties, implant surgery.
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