Biodegradation behaviour of Fe-based alloys in Hanks’Balanced Salt Solutions:Part II.The evolution of local pH and dissolved oxygen concentration at metal interface  

作　　者：Cheng Wang Christabelle Tonna Di Mei Joseph Buhagiar Mikhail L.Zheludkevich Sviatlana V.Lamaka 

机构地区：[1]Institute of Surface Science,Helmholtz-Zentrum Hereon,Geesthacht,21502,Germany [2]Department of Metallurgy and Materials Engineering,University of Malta,Msida,Malta [3]School of Materials Science and Engineering&Henan Key Laboratory of Advanced Magnesium Alloy,Zhengzhou University,Zhengzhou,450001,PR China [4]Institute for Materials Science,Faculty of Engineering,Kiel University,Kiel,24103,Germany

出　　处：《Bioactive Materials》2022年第1期412-425,共14页生物活性材料（英文）

基　　金：Mr.Cheng Wang thanks China Scholarship Council for the award of fellowship and funding(No.201806310128);Christabelle Tonna and Joseph Buhagiar would like to thank the Malta Council for Science and Technology,for funding Project BioSA(R&I-2017-037-T)through the FUSION:R&I Technology Development Programme.

摘　　要：Commercially pure Fe,Fe35Mn,and(Fe35Mn)5Ag alloys were prepared by uniaxial pressing of the mixture of individual powders,followed by sintering.The influence of the alloying elements Mn and Ag on the corrosion behaviour of these Fe-based alloys was investigated in Hanks’Balanced Salt Solution(HBSS).Furthermore,the role of the components in HBSS,particularly Ca^(2+)ions during alloys degradation was studied.Distribution of local pH and dissolved oxygen concentration was measured 50μm above the interface of the degrading alloys.The results revealed that 5 wt%Ag addition to Fe35Mn alloy triggered micro-galvanic corrosion,while uniform corrosion dominated in pure Fe and Fe35Mn.Fast precipitation of Ca-P-containing products on the surface of these Fe-based alloys buffered local pH at the metal interface,and blocked oxygen diffusion at the initial stages of immersion.In the(Fe35Mn)5Ag,the detachment or structural changes of Ca-P-containing products gradually diminished their barrier property.These findings provided valuable insights into the degradation mechanism of promising biodegradable Fe-based alloys.

关 键 词：Local pH Dissolved oxygen Fe alloys Biodegradable metals Powder metallurgy 

分 类 号：R318[医药卫生—生物医学工程] TB3[医药卫生—基础医学]