The efficiency of the green inhibitors(sodium salts of fumarate,glycolate and gluconate)in suppressing corrosion of the structural MA8 magnesium alloy(Mg–Mn–Ce)and the biomedical Mg–0.8Ca alloy was studied using th...The efficiency of the green inhibitors(sodium salts of fumarate,glycolate and gluconate)in suppressing corrosion of the structural MA8 magnesium alloy(Mg–Mn–Ce)and the biomedical Mg–0.8Ca alloy was studied using the hydrogen evolution measurements,mass loss test,EIS,PDP,SVET/SIET.The analysis of the morphology,chemical composition,and growth kinetic of corrosion films formed in 0.9 wt%NaCl solution with and without corrosion inhibitors was carried out.The most compact surface film with the smallest thickness was formed in a saline solution with sodium fumarate.The Mg alloy samples exhibited the highest polarization resistance,the lowest localized electrochemical activity,and the lowest corrosion rate in saline with the addition of sodium fumarate and sodium glycolate.The efficiency of the applied inhibitors was up to 81%.The model of the corrosion mechanism based on the sorption of molecules of organic inhibitors is proposed.The results show the high compatibility of the used inhibitors with the calcium-phosphate PEO-matrix,indicating the possibility of forming a self-healing coating by means of these active substances.展开更多
This article discusses potential solutions to overcome current limitations for clinical implementation of Mg implants by forming the biocompatible hybrid PEO-based inhibitor-and polymer-containing coatings for a contr...This article discusses potential solutions to overcome current limitations for clinical implementation of Mg implants by forming the biocompatible hybrid PEO-based inhibitor-and polymer-containing coatings for a controlled corrosion degradation of the bioresorbable material.Multifunctional hybrid coatings were obtained on MA8 magnesium alloy.The porous ceramic-like coating synthesized by plasma electrolytic oxidation served as a base for further modification with bioresorbable polymer(polycaprolactone,PCL)contained halloysite nanotubes(HNTs)with corrosion inhibitor(benzotriazole,BTA).The method for HNT impregnating with BTA and introducing them into the matrix of PCL was proposed.The chemical composition of the protective layers was studied using SEM-EDX,XRD,XPS,and Raman microspectroscopy.Anticorrosion protection level of the coated specimens was determined by means of electrochemical techniques,weight loss,and hydrogen evolution tests.The samples with hybrid layers showed the best corrosion protection during 23 h exposure to Hanks’Balanced Salt Solution(|Z|_(f=0.1 Hz)=1.02 MΩ·cm^(2),I_(C)=11 nA·cm^(-2),R_(p)=2.4 MΩ·cm^(2))and the lowest degradation rate(0.021 mm/year)after 7 day of exposure to HBSS among all the tested samples.The electrochemical activity on microscale of samples with the studied coatings was estimated by localized electrochemical techniques.The degradation mechanism of specimens with hybrid layers was proposed.The prospects of hybrid layer application in regulating the resorption process of Mg alloys were shown.展开更多
基金supported by the Grant of Russian Science Foundation,Russia(project no 20–13–00130,https://rscf.ru/en/project/20-13-00130/)supported by the Grant of Russian Science Foundation,Russia(project no 24–73–10008,https://rscf.ru/en/project/24-73-10008/)XRD data were obtained under the government assignments from the Ministry of Science and Higher Education of the Russian Federation,Russia(project no FWFN-2024-0001).
文摘The efficiency of the green inhibitors(sodium salts of fumarate,glycolate and gluconate)in suppressing corrosion of the structural MA8 magnesium alloy(Mg–Mn–Ce)and the biomedical Mg–0.8Ca alloy was studied using the hydrogen evolution measurements,mass loss test,EIS,PDP,SVET/SIET.The analysis of the morphology,chemical composition,and growth kinetic of corrosion films formed in 0.9 wt%NaCl solution with and without corrosion inhibitors was carried out.The most compact surface film with the smallest thickness was formed in a saline solution with sodium fumarate.The Mg alloy samples exhibited the highest polarization resistance,the lowest localized electrochemical activity,and the lowest corrosion rate in saline with the addition of sodium fumarate and sodium glycolate.The efficiency of the applied inhibitors was up to 81%.The model of the corrosion mechanism based on the sorption of molecules of organic inhibitors is proposed.The results show the high compatibility of the used inhibitors with the calcium-phosphate PEO-matrix,indicating the possibility of forming a self-healing coating by means of these active substances.
基金supported by Russian Science Foundation,Russia(project no.24-73-10008,https://rscf.ru/en/project/24-73-10008/)the government assignments from the Ministry of Science and Higher Education of the RF,Russia(project no.FWFN-2024-0001).
文摘This article discusses potential solutions to overcome current limitations for clinical implementation of Mg implants by forming the biocompatible hybrid PEO-based inhibitor-and polymer-containing coatings for a controlled corrosion degradation of the bioresorbable material.Multifunctional hybrid coatings were obtained on MA8 magnesium alloy.The porous ceramic-like coating synthesized by plasma electrolytic oxidation served as a base for further modification with bioresorbable polymer(polycaprolactone,PCL)contained halloysite nanotubes(HNTs)with corrosion inhibitor(benzotriazole,BTA).The method for HNT impregnating with BTA and introducing them into the matrix of PCL was proposed.The chemical composition of the protective layers was studied using SEM-EDX,XRD,XPS,and Raman microspectroscopy.Anticorrosion protection level of the coated specimens was determined by means of electrochemical techniques,weight loss,and hydrogen evolution tests.The samples with hybrid layers showed the best corrosion protection during 23 h exposure to Hanks’Balanced Salt Solution(|Z|_(f=0.1 Hz)=1.02 MΩ·cm^(2),I_(C)=11 nA·cm^(-2),R_(p)=2.4 MΩ·cm^(2))and the lowest degradation rate(0.021 mm/year)after 7 day of exposure to HBSS among all the tested samples.The electrochemical activity on microscale of samples with the studied coatings was estimated by localized electrochemical techniques.The degradation mechanism of specimens with hybrid layers was proposed.The prospects of hybrid layer application in regulating the resorption process of Mg alloys were shown.
