To investigate the influence of oxygen content in a physiological liquid environment on the corrosion behavior of biomedical zinc-based alloys,a simulated bodily fluid environment with varying dissolved oxygen was est...To investigate the influence of oxygen content in a physiological liquid environment on the corrosion behavior of biomedical zinc-based alloys,a simulated bodily fluid environment with varying dissolved oxygen was established in vitro using external oxygen supply equipment.The influence of dissolved oxygen concentration on the corrosion behavior of pure Zn and Zn−Cu alloys was studied with scanning electron microscopy,energy dispersive spectroscopy,Fourier transform infrared spectrometry,and electrochemical analysis.Due to oxygen absorption corrosion,the increase in dissolved oxygen concentration increases the pH value of the solution and promotes the accumulation of corrosion product layer.Compared with the environment without additional oxygen supply,the corrosion rate of the sample under the continuous oxygen supply condition is increased by one order of magnitude.Because the Zn−Cu alloy has micro-galvanic corrosion,its corrosion rate is about 1.5 times that of pure zinc under different dissolved oxygen conditions.展开更多
Biodegradable polymer coatings are commonly used as protective barriers on magnesium(Mg) and its alloys.The properties of polymers,such as crystallinity and degradation properties,have a crucial impact on their corros...Biodegradable polymer coatings are commonly used as protective barriers on magnesium(Mg) and its alloys.The properties of polymers,such as crystallinity and degradation properties,have a crucial impact on their corrosion resistance.In this work,polyhydroxybutyrate(PHB) coatings are deposited on Mg sheets with a thickness similar to that of cardiovascular stents to assess the degradation behavior,and poly-lactic acid(PLA)-coated Mg is also investigated to compare the structure-propertyperformance relationship.The hydrogen evolution volume(HEV) of the PHB-coated sample decreases by 30% after immersion in artificial blood plasma(AP) for 7 days,whereas the PL A-coated sample shows an increase of 154%.The PHB coating also shows excellent durability at a constant voltage,compared to severe rupture of the PLA coating.The degradation behavior of the coated-Mg samples is evaluated in AP solution containing different concentrations of the bovine serum albumin(BSA).Corrosion is inhibited as the protein concentration increases.The degradation rates of the Mg,PLA-coated Mg,and PHBcoated Mg decrease by 65%,88%,and 75% for 5 g L^(-1)BSA,respectively.Our results reveal that higher crystallinity and less acidic degradation products give rise to better durability,while the acid self-catalytic effect leads to the failure of PLA.The protein-polymer interactions are determined and the empirical relationship of HEV is established.展开更多
基金supported by the National Natural Science Foundation of China(Nos.52171236,51971062,52231005)Open Research Fund of Jiangsu Key Laboratory for Advanced Metallic Materials,Southeast University,China(No.AMM2024A01)+3 种基金Suzhou Science and Technology Project,China(Nos.SJC2023005,SZS2023023)City University of Hong Kong Donation Research Grant,China(No.DON-RMG 9229021)City University of Hong Kong Strategic Research Grant,China(No.SRG 7005505)City University of Hong Kong Donation Grant,China(No.9220061)。
文摘To investigate the influence of oxygen content in a physiological liquid environment on the corrosion behavior of biomedical zinc-based alloys,a simulated bodily fluid environment with varying dissolved oxygen was established in vitro using external oxygen supply equipment.The influence of dissolved oxygen concentration on the corrosion behavior of pure Zn and Zn−Cu alloys was studied with scanning electron microscopy,energy dispersive spectroscopy,Fourier transform infrared spectrometry,and electrochemical analysis.Due to oxygen absorption corrosion,the increase in dissolved oxygen concentration increases the pH value of the solution and promotes the accumulation of corrosion product layer.Compared with the environment without additional oxygen supply,the corrosion rate of the sample under the continuous oxygen supply condition is increased by one order of magnitude.Because the Zn−Cu alloy has micro-galvanic corrosion,its corrosion rate is about 1.5 times that of pure zinc under different dissolved oxygen conditions.
基金jointly supported by the National Natural Science Foundation of China(No.52171236)State Key Program of the National Natural Science Foundation of China(No.52231005)+5 种基金Open Research Fund of Jiangsu Key Laboratory for Advanced Metallic Materials,Southeast University(No.AMM2024A01)Suzhou Science and Technology Project(Nos.SJC2023005 and SZS2023023)City University of Hong Kong Donation Research Grants(Nos.DON-RMG 9229021 and 9220061)Hong Kong Innovation and Technology Fund(Nos.ITF GHP/212/22GD and CityU 440399)Hong Kong PDFS_RGC Postdoctoral Fellowship Scheme(Nos.PDFS2122-1S08 and CityU 9061014)Hong Kong HMRF(Health and Medical Research Fund)(Nos.2120972 and CityU 9211320)
文摘Biodegradable polymer coatings are commonly used as protective barriers on magnesium(Mg) and its alloys.The properties of polymers,such as crystallinity and degradation properties,have a crucial impact on their corrosion resistance.In this work,polyhydroxybutyrate(PHB) coatings are deposited on Mg sheets with a thickness similar to that of cardiovascular stents to assess the degradation behavior,and poly-lactic acid(PLA)-coated Mg is also investigated to compare the structure-propertyperformance relationship.The hydrogen evolution volume(HEV) of the PHB-coated sample decreases by 30% after immersion in artificial blood plasma(AP) for 7 days,whereas the PL A-coated sample shows an increase of 154%.The PHB coating also shows excellent durability at a constant voltage,compared to severe rupture of the PLA coating.The degradation behavior of the coated-Mg samples is evaluated in AP solution containing different concentrations of the bovine serum albumin(BSA).Corrosion is inhibited as the protein concentration increases.The degradation rates of the Mg,PLA-coated Mg,and PHBcoated Mg decrease by 65%,88%,and 75% for 5 g L^(-1)BSA,respectively.Our results reveal that higher crystallinity and less acidic degradation products give rise to better durability,while the acid self-catalytic effect leads to the failure of PLA.The protein-polymer interactions are determined and the empirical relationship of HEV is established.
