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

A. S. Gnedenkov, Lead Researcher, 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

A series of studies has been conducted that aimed to develop a technique for modifying the surface of a bioresorbable Mg – Mn – Ce alloy by forming inhibitor- and polymer-containing coatings of a new type with the aim to reduce the intensity of its corrosion degradation and enable its further long-term practical use in implant surgery. A bioactive calcium-phosphate coating with a developed surface was produced on the material surface by plasma electrolytic oxidation (PEO). The authors used the case study of stearic acid to select and optimize a technique for impregnating the PEO layer with corrosion inhibitor, aimed at lowering the electrochemical activity of the material in view. A technique was developed to improve the anticorrosion properties and lower the probability of the inhibitor coming out of pores. The technique implies treatment of the formed inhibitor-containing composite layer with a biodegradable polymer — i. e. polycaprolactone (PCL). Some techniques are described for producing hybrid coatings by successive impregnation of the base PEO layer with stearic acid and PCL (GP-2SP) and by single-step deposition of PCL and stearic acid from a dichloromethane-based solution (GP-1SP). The authors relied on X-ray phase analysis and energy dispersive spectroscopy to determine the composition of the formed protective layers and confirm the presence of stearic acid and PCL in the coatings. A series of electrochemical in vitro tests was conducted in a normal saline solution, which is most similar to human plasma in terms of ion composition. Hybrid coatings produced by two-step deposition of inhibitor and polymer (GP-2SP) were found to manifest the best protective properties among the studied samples. The efficiency of the inhibitor as part of such anticorrosion coating was 99.3%.

Support for this research was provided under a grant by the Russian Science Foundation; Project No. 20-13-00130.

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