Design of self-healing PEO-based protective layers containing in-situ grown LDH loaded with inhibitor on the MA8 magnesium alloy

作     者：A.S.Gnedenkov S.L.Sinebryukhov A.D.Nomerovskii V.S.Filonina A.Yu.Ustinov 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：2023年第11卷第10期

页      面：3688-3709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/) supported by the Grant of Russian Science Foundation,Russia (project no.20-13-00130,https://rscf.ru/en/ project/20-13-00130/) 

主　　题：Magnesium alloy Plasma electrolytic oxidation Layered double hydroxides Corrosion inhibitor Electrochemistry Corrosion rate 

摘      要：The high corrosion rate of magnesium and its alloys in chloride-containing solution significantly reduces the potential of this material for diverse ***,the formation of a smart protective coating was achieved in this work to prevent degradation of the MA8 magnesium alloy.A porous ceramic-like matrix was obtained on the material by plasma electrolytic oxidation(PEO).Further surface functionalization was performed using layered double hydroxides(LDH) served as nanocontainers for the corrosion *** methods of LDH intercalation with benzotriazole(BTA) were *** composition and morphology of the formed coating were studied using SEM-EDX analysis,XRD,XPS,and Raman *** corrosion behavior of the coated samples was evaluated using electrochemical impedance spectroscopy and potentiodynamic *** corrosion rate was estimated using volumetry and gravimetry *** formed composite coating provides the Mg alloy with the lowest corrosion activity(|Z|_(f)=0.1 Hz)=8.48·10^(5) Ω·cm^(2),I_(c)=1.4·10^(-8)A/cm^(2),P_(H)=0.21 mm/year) and improves the protective properties of the PEO-coated sample(|Z|_(f)=0.1 Hz)=8.37·10^(3) Ω·cm^(2),I_(c)=4.1·10^(-7)A/cm^(2),P_(H)=0.31 mm/year).The realization of the self-healing effect of the inhibitor-containing LDH/PEO-coated system was studied using localized electrochemical methods(SVET and SIET) with two artificial defects on the surface.A mechanism involving three stages for the active corrosion protection of the alloy was *** findings contribute to the follow-up work of developing modified LDH/PEO-based structures that promote the Mg alloy with high corrosion resistance,superior electrochemical performance for applications in various fields of industry and medicine.