Smart composite antibacterial coatings with active corrosion protection of magnesium alloys

作     者：A.S.Gnedenkov S.L.Sinebryukhov V.S.Filonina N.G.Plekhova S.V.Gnedenkov 

作者机构：Institute of Chemistry of FEB RAS159 Pr.100-letiya VladivostokaVladivostok690022Russia 

出 版 物：《Journal of Magnesium and Alloys》 (镁合金学报（英文）)

年 卷 期：2022年第10卷第12期

页      面：3589-3611页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the Grant of Russian Science Foundation, Russia (project no. 21–73– 10148, https://rscf.ru/en/project/21–73–10148/) The study of material‘s structure, composition, and corrosion processes kinetics was supported by the Grant of Russian Science Foundation, Russia (project no. 20–13–00130, https://rscf.ru/en/project/20–13–00130/) Raman spectra were acquired under the government assignments from the Ministry of Science and Higher Education of the Russian Federation, Russia (project no. FWFN(0205)-2022–0003) 

主　　题：Magnesium alloy Plasma electrolytic oxidation Corrosion inhibitor Self-healing Protective coatings 

摘      要：A new method of the formation of composite coatings with the function of active corrosion protection of magnesium alloys was developed using the plasma electrolytic oxidation(PEO) method. Susceptibility of PEO-layers to pitting formation was evaluated using localized electrochemical methods(SVET/SIET). The morphological features and electrochemical properties of composite coatings were studied using SEM/EDX, XRD, micro-Raman spectroscopy and EIS/PDP measurements, respectively. The effect of surface layers impregnation with corrosion inhibitor on their protective properties in a corrosive environment was established. Additional protection was achieved using controllable coating pore sealing with polymer. It was found that the polymer treatment of the PEO-layer does not reduce the inhibitor’s efficiency. The formed protective composite inhibitor-and-polymer-containing layers decrease the corrosion current density of a magnesium alloy in a 3 wt.% Na Cl solution to three orders of magnitude. This predetermines the prospect of new smart coatings formation that significantly expand the field of application of electrochemically active materials. The mechanism of smart composite coating corrosion degradation was established. The antibacterial activity of the inhibitor-containing coatings against S. aureus methicillin-resistant strain was proved using the in vitro model. These protective layers are promising for reducing the incidence of implant-associated infections.