Design multifunctional Mg-Zr coatings regulating Mg alloy bioabsorption

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外文摘要：Magnesium(Mg)alloys are widely used for temporary bone implants due to their favorable biodegradability,cytocompatibility,hemocompati-bility,and close mechanical properties to bone.However,rapid degradation and inadequate strength limit their applicability.To overcome this,the direct current magnetron sputtering technique is employed for surface coating in Mg-based alloys using various zirconium(Zr)content.This approach presents a promising strategy for simultaneously improving corrosion resistance,maintaining biocompatibility,and enhancing strength without compromising osseointegration.By leveraging Mg's inherent biodegradability,it has the potential to minimize the need for secondary surgeries,thereby reducing costs and resources.This paper is a systematic study aimed at understanding the corrosion mechanisms of Mg-Zr coatings,denoted Mg-xZr(x=0％-5％,atomic percent).Zr-doped coatings exhibited columnar growth leading to denser and refined structures with increasing Zr content.XRD analysis con-firmed the presence of the Mg(00.2)basal plane,shifting towards higher angles(1.15°)with 5％(atomic percent)Zr doping due to lattice pa-rameter changes(i.e.,decrease and increase of"c"and"a"lattice parameters,respectively).Mg-Zr coatings exhibited"liquidphilic"behavior,while Young's modulus retained a steady value around 80 GPa across all samples.However,the hardness has significantly improved across all samples'coating,reaching the highest value of(2.2±0.3)GPa for 5％Zr.Electrochemical testing in simulated body fluid(SBF)at 37 ℃ re-vealed a significant enhancement in corrosion resistance for Mg-Zr coatings containing 1.0％-3.4％(atomic percent)Zr.Compared with the 5％Zr coating which exhibited a corrosion rate of 32 mm·a-1,these coatings displayed lower corrosion rates,ranging from 1 mm·a-1 to 12 mm·a-1.This synergistic enhancement in mechanical properties and corrosion resistance,achieved with 2.0％-3.4％(atomic percent)Zr,sug-gests potential ability for reducing stress shielding and controlled degradation performance,and consequently,promising functional biodegrada-ble materials for temporary bone implants.

外文关键词：

Mg-Zr coatingsMagnetron sputteringNanoindentationCorrosion resistanceBone implants

作者：

Zohra Benzarti、Sandesh Itani、José David Castro、Sandra Carvalho、Ana Sofia Ramos

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作者单位：

University of Coimbra,CEMMPRE,ARISE,Department of Mechanical Engineering,Rua Luís Reis Santos,3030-788,Coimbra,Portugal

Laboratory of Multifunctional Materials and Applications(LaMMA),Department of Physics,Faculty of Sciences of Sfax,University of Sfax,Soukra Road km 3.5,B.P.1171,Sfax,3000,Tunisia

基金：

ILLIANCE High Performing EnergyProjeto apoiado pelo PRR-Plano de Recupera??o e Resiliência e pelos Fundos Europeus Next Generation EUnational funds through FCT-Funda??o para a Ciência e a Tecnolognational funds through FCT-Funda??o para a Ciência e a Tecnolog

项目编号：

722502/C05-i01/2022UID/EMS/00285/2020ARISE-LA/P/0112/2020

出版年：

2024

DOI：

10.1016/j.jma.2024.04.009

镁合金学报(英文)

ISSN：2213-9567

年,卷(期)：2024.12(4)