Mg-Ti hybrid joints:Surface modification,corrosion studies and 3D-pore investigation using synchrotron-based microtomography  

作　　者：M.Fazel V.M.Garamus M.Serdechnova Fabian Wilde F.Wieland E.Nidadavolu T.Wu T.Ebel C.Blawert R.Willumeit-Römer M.L.Zheludkevich 

机构地区：[1]Institute of Metallic Biomaterials,Helmholtz-Zentrum Hereon,Geesthacht 21502,Germany [2]Institute of Surface Science,Helmholtz-Zentrum Hereon,Geesthacht 21502,Germany [3]Institute of Materials Physics,Helmholtz-Zentrum Hereon,Geesthacht 21502,Germany [4]Faculty of Engineering,Institute of Materials Science,Kiel University,Kaiserstraße 2,Kiel 24143,Germany

出　　处：《Journal of Magnesium and Alloys》2024年第8期3142-3158,共17页镁合金学报（英文）

基　　金：support from the Alexander von Humboldt Foundation.We thank DESY(Hamburg,Germany)for granting the proposal I20221296;support at the PETRA III P05 end-station.

摘　　要：A new direction toward the future of orthopedic implants is to combine biodegradable Mg alloys with permanent Ti to produce selectively biodegradable hybrid joints for advanced tissue engineering.However,the strong galvanic corrosion between Mg and Ti is a major issue to be considered.This work aims to explore plasma electrolytic oxidation(PEO)as a single-step coating treatment to allow for an acceptable degradation behavior of MgTi hybrid systems.To this end,MgTi hybrid joints were produced through the heat treatment of Mg-0.6Ca and commercially pure Ti specimens at 640°C for 8 h.A single-step PEO treatment was then employed to create a protective layer on the surface of hybrid couples.Even though the scanning electron microscopy(SEM)images showed only a porosity of 6%and 12%within the PEO layers on single Mg and MgTi couples,3D investigation of the synchrotron-based microtomography data demonstrated a porosity of 18%and 30%with a considerable number of interconnected pores.According to the electrochemical impedance spectroscopy measurements,the impedance modulus at all frequencies on coated MgTi coupled specimens was lower than that on the coated single Mg-0.6Ca and pure Ti.However,the application of PEO treatment significantly decreased the strong galvanic degradation of Mg-0.6Ca in contact with Ti.The results of hydrogen evolution tests revealed that PEO-treated MgTi couples showed a similar degradation behavior as the single alloy during the first day of immersion.

关 键 词：Mg-Ti hybrid implants Plasma electrolytic oxidation Synchrotron microtomography Galvanic corrosion 

分 类 号：TG146.22[一般工业技术—材料科学与工程] R318.08[金属学及工艺—金属材料]