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Deteriorated corrosion performance of micro-alloyed Mg-Zn alloy after heat treatment and mechanical processing

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Journal of Materials Science & Technology 2021年第33期92卷 214-224页

作者： Yiming Jin Carsten Blawert Hong Yang Bjorn Wiese Jan Bohlen Di Mei Min Deng frank feyerabend Regine Willumeit Division of Metallic Biomaterials Helmholtz-Zentrum Geesthacht21502 GeesthachtGermany Southwest Technology and Engineering Research Institute 400039 ChongqingChina Magnesium Innovation Center Helmholtz-Zentrum Geesthacht21502 GeesthachtGermany State Key Laboratory of Mechanical Transmissions College of Materials Science and EngineeringChongqing UniversityChongqing400044China National Engineering Research Center for Magnesium Alloys Chongqing University400044 ChongqingChina Faculty of Engineering Christian-Albrechts-Universität zu Kiel24143 KielGermany

The corrosion performances of the as-cast and solution-treated Mg-0.5Zn samples were investigated in 0.9%Na Cl solution and *** the electrochemical measurement results and corrosion morphology observations,it is found that the corrosion resistance of Mg-0.5Zn deteriorated with the extension of solution treatment *** main reason was the formation of Fe-Si precipitates with higher Fe concentrations during heat *** Fe-Si precipitates,especially the ones with high Fe contents influenced the corrosion initiation and propagation *** regard of corrosion performance,the solution-treated and then extruded sample was also performing not as good as the cast and then directly extruded sample.

关键词： Magnesium Alloy Internetallics SEM Inclusions Corrosion

Magnesium degradation under physiological conditions - Best practice

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Bioactive Materials 2018年第2期3卷 174-185页

作者： Jorge Gonzalez Rui Qing Hou Eshwara P.S.Nidadavolu Regine Willumeit-Romer frank feyerabend Institute of Materials Research Division Metallic BiomaterialsHelmholtz-Zentrum GeesthachtMax-Planck-Str.121502 GeesthachtGermany

This review focusses on the application of physiological conditions for the mechanistic understanding of magnesium *** the undisputed relevance of simplified laboratory setups for alloy screening purposes,realistic and predictive in vitro setups are *** to the complexity of these systems,the review gives an overview about technical measures,defines some caveats and can be used as a guideline for the establishment of harmonized laboratory approaches.

关键词： In vitro Flow conditions Degradation products Cell culture conditions

Pore characterization of PM Mg–0.6Ca alloy and its degradation behavior under physiological conditions

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Journal of Magnesium and Alloys 2021年第2期9卷 686-703页

作者： Eshwara Phani Shubhakar Nidadavolu Diana Krüger Berit Zeller-Plumhoff Domonkos Tolnai Björn Wiese frank feyerabend Thomas Ebel Regine Willumeit-Römer Division Metallic Biomaterials Institute of Materials ResearchHelmholtz-Zentrum GeesthachtMax-Planck-Str.1Geesthacht 21502Germany Magnesium Innovation Center(MagIC) Institute of Materials ResearchHelmholtz-Zentrum GeesthachtMax-Planck-Str.1Geesthacht 21502Germany

Several material parameters affect degradation characteristics of Mg and its alloys under physiological *** Mg materials are interesting for their simultaneous degradation and drug delivery ***,an increase in pore surface area is detrimental to both degradation resistance and subsequent mechanical *** present work aims at determining the threshold porosity value in Mg–0.6 Ca specimens produced by powder metallurgy(PM)below which low degradation rates persist with acceptable mechanical *** different porous Mg–0.6 Ca specimens containing both closed and open pore structures were fabricated with porosities ranging from 3%to 21%.Degradation profiles were obtained via a semi static immersion test over 16 days under physiological conditions using Dulbecco’s modified Eagle’s medium with Glutamax and 10%fetal bovine serum as *** results are related to morphological pore parameters like pore size distribution,pore interconnectivity and pore curvatures that were quantified using an ex situμCT *** general,with decreasing porosity a decrease in pore interconnectivity is seen followed by rounding of the *** degradation rates(MDR<0.3 mm/year)are observed in specimens until 10%porosity,however,the upper bound for reproducible degradation is observed to be in specimens until 12%*** porosity level also marks the transition from closed to open pore nature with a simultaneous change in pore interconnectivity from less than 10%to greater than 95%,below and above this porosity level,*** tensile strength and elongation to failure recorded for specimens with 10%porosity were 70 MPa and 2%,respectively displaying positive traits of both homogenous degradation and mechanical *** results suggest that high pore interconnectivity is the dominant factor controlling degradation and mechanical properties in porous Mg-0.6 Ca *** results also indicate a good sintering respons

关键词： Porous Mg-0.6Ca In vitro Degradation μCT Sintering

Effects of dynamic flow rates on degradation deposition behavior of Mg scaffold

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镁合金学报(英文) 2023年第6期11卷 2054-2060页

作者： Gaozhi Jia Meng Zhou Yicong Huang Chenxin Chen Liang Jin Qian Wu Jian Weng Fei Yu Ao Xiong Guangyin Yuan frank feyerabend Hui Zeng Department of Bone&Joint Surgery Peking University Shenzhen HospitalShenzhen Peking University-The Hong Kong University of Science and Technology Medical CenterShenzhen Institute of Information TechnologyShenzhen 518036China National Engineering Research Center of Light Alloy Net Forming&State Key Laboratory of Metal Matrix Composite Shanghai Jiao Tong UniversityShanghai 200240China Beijing Key Laboratory of Civil Aircraft Structures and Composite Materials Beijing Aircraft Technology Research Institute of COMACBeijing 102211China College of Life Science Zhejiang Chinese Medical UniversityHangzhou 310053China Shenzhen Branch Guangdong Laboratory of Lingnan Modern AgricultureGenome Analysis Laboratory of the Ministry of Agriculture and Rural AffairsAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhen 518120China Department of Orthopaedics Peking University People’s HospitalBeijing 100044China Division of Metallic Biomaterials Institute of Materials ResearchHelmholtz-Zentrum HereonGeesthacht 21502Germany National&Local Joint Engineering Research Center of Orthopaedic Biomaterials Peking University Shenzhen HospitalShenzhen 518036China

Degradability of bone tissue engineering scaffold that matching the regeneration rate could allow a complete replacement of host ***,the porous structure of biodegradable Mg scaffolds certainly generated high specific surface area,and the three-dimensional interconnected pores provided fast pervasive invasion entrance for the corrosive medium,rising concern of the structural integrity during the *** clarify the structural evolution of the three-dimensional(3D)porous structure,semi-static immersion tests were carried out to evaluate the degradation performance in our previous ***,dynamic immersion tests mimicking the in vivo circulatory fluid through the interconnected porous structure have yet been ***,the effects of dynamic flow rates on the degradation deposition behavior of 3D porous Mg scaffolds were rarely *** this study,Mg scaffolds degraded at three flow rates exhibited different degradation rates and deposition process.A flow rate of 0.5 m L/min introduced maximum drop of porosity by accumulated deposition *** deposition products provided limited protection against the degradation process at a flow rate of 1.0 m L/*** three-dimensional interconnected porous structure of Mg scaffold degraded at 2.0 m L/min well retained after 14 days showing the best interconnectivity resistance to the degradation deposition *** dynamic immersion tests disclosed the reason for the different degradation rates on account of flow rates,which may bring insight into understanding of varied in vivo degradation rates related to implantation sites.

关键词： Porous Mg scaffold Degradability Porosity Dynamic immersion test Degradation rate

Proteome analysis of human mesenchymal stem cells undergoing chondrogenesis when exposed to the products of various magnesium-based materials degradation

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Bioactive Materials 2019年第1期4卷 168-188页

作者： Adela Helvia Martínez Sánchez Maryam Omidi Marcus Wurlitzer Marceline Manka Fuh frank feyerabend Hartmut Schlüter Regine Willumeit-Römer Bérengère J.C.Luthringer Division of Metallic Biomaterials Institute of Material ResearchHelmholtz-Zentrum GeesthachtMax Planck Strasse 121502GeesthachtGermany Institute of Clinical Chemistry and Laboratory Medicine Mass Spectrometric ProteomicsUniversity Medical Center Hamburg-EppendorfMartinistraße 5220246HamburgGermany

Treatment of physeal fractures(15%–30%of all paediatric fractures)remains a challenge as in approximately 10%of the cases,significant growth disturbance may *** Magnesium-based implants represent a strategy to minimize damage(i.e.,load support until bone healing without second surgery).Nevertheless,the absence of harmful effects of magnesium-implants and their degradation products on the growth plate should be ***,the proteome of human mesenchymal stem cells undergoing chondrogenesis was evaluated when exposed to the products of various Magnesium-based materials *** results of this study indicate that the materials induced regulation of proteins associated with cell chondrogenesis and cartilage formation,which should be beneficial for cartilage regeneration.

关键词： Stem cells differentiation Chondrogenesis Proteomics Magnesium biomaterial Biodegradable implant

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医用可降解镁与有机分子间的相互作用

医用可降解镁与有机分子间的相互作用