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Corrosion Behavior ofAg-doped TiO2 Coatings on Commercially Pure Tita- nium in simulated body fluid Solution

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Journal of Bionic Engineering 2016年第3期13卷 397-405页

作者： Tuba Yetim Department of Chemical Engineering Faculty of Engineering and Architecture Erzurum Technical University Erzurum 25100 Turkey

TiO2 films including different amounts of Ag obtained by sol-gel method on commercially pure titanium （CP-Ti） and the corrosion properties of Ag-doped TiO2 films were investigated by potentiodynamic polarisation and Electrochemical ImpedanceSpectroscopy （EIS） tests in simulated body fluid （SBF） solution. The results were compared with untreated and un-doped samples. Surface characterizations before and after the corrosion tests were performed by the Scanning Electron Microscopy （SEM） and X-ray Diffraction （XRD） analysis. It was observed that Ag-doping for TiO2 films improved the corrosion resistance when compared with untreated and un-doped TiO2 film coated samples. The highest corrosion resistance was obtained from Ag-doped samples coated with a solution of 0.05 M Ag.

关键词： TiO2 coating Ag-doping corrosion CP-Titanium simulated body fluid

Fatigue Behaviors of a Ni-free ZrCuFeAlAg Bulk Metallic Glass in simulated body fluid

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Journal of Materials Science & Technology 2014年第6期30卷 622-626页

作者： Yimei Wang Yan Liu Lin Liu School of Materials Science and Engineering State Key Lab for Materials Processing and Die & Mould Technology Huazhong University of Science and Technology

Fatigue behaviors of a biocompatible Ni-free Zr60.14Cu22.31Fe4.85Al9.7Ag3 Zr-based bulk metallic glass （BMG） have been studied under three-point-bending test in a simulated body fluid （SBF） at 37 ℃ and compared with those in air at room temperature （RT）. The BMG shows a high fatigue limit of approximately 366 MPa in SBF, which was slightly lower than that in air （400 MPa）. The fatigue cracks tended to initiate from the defects such as cast-pores, inclusions and corners of the samples and propagate in a similar path in SBF and in air. Three distinct regions, i.e. a crack-initiation region, a stable crack-growth region and an unstable fast-fracture region were clearly observed on the fatigue-fractured surface. Although pitting occurred at the defects where crack initiated, it does not affect significantly the fatigue life of the BMG, because the lifetime in the present BMG is mainly determined by crack propagation. The high corrosion-fatigue limit of the studied BMG results from its excellent corrosion resistance in SBF and intrinsically good toughness.

关键词： Ni-free Zr-based bulk metallic glass Corrosion fatigue simulated body fluid

Initial formation of corrosion products on pure zinc in simulated body fluid

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Journal of Materials Science & Technology 2018年第12期34卷 2271-2282页

作者： Lijun Liu Yao Meng Chaofang Dong Yu Yan Alex A.Volinsky Lu-Ning Wang State Key Laboratory for Advanced Metals and Materials School of Materials Science and EngineeringUniversity of Science and Technology Beijing Institute for Advanced Materials and Technology University of Science and Technology Beijing Department of Mechanical Engineering University of South Florida

Zinc was recently suggested to be a potential candidate material for degradable coronary artery *** corrosion behavior of pure zinc exposed to r-SBF up to 336 h was investigated by electrochemical measurements and immersion tests. The morphology and chemical composites of the corrosion products were investigated by scanning electron microscope, grazing-incidence X-ray diffraction, X-ray photoelectron spectroscopy and Fourier transform infrared spectrometer. The results demonstrate that the initial corrosion products on the pure zinc mainly consist of zinc oxide/hydroxide and zinc/calcium phosphate compounds. The pure Zn encounters uniform corrosion with an estimated corrosion rate of 0.02-0.07 mmy;during the immersion, which suggests the suitability of pure Zn for biomedical applications.

关键词： Zinc Stent Corrosion simulated body fluid

Understanding the effects of excimer laser treatment on corrosion behavior of biodegradable Mg-1Ca alloy in simulated body fluid

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Journal of Magnesium and Alloys 2022年第4期10卷 1004-1023页

作者： Yuxiang Liu Michele Curioni Shiyun Dong Zhu Liu Department of Materials School of Natural SciencesThe University of ManchesterManchesterM139PLUK National Key Laboratory for Remanufacturing Beijing100072China

In this study,a KrF excimer laser was used to modify the biodegradable Mg-1Ca alloy and the time-evolution degradation behavior of the alloy before and after laser treatment was investigated in simulated body fluid(SBF)solution using immersion tests and electrochemical impedance spectroscopy(EIS).A 5μm melted layer with a homogeneous microstructure and an MgO film on the surface were achieved by laser *** observations(hydrogen evolution,morphology and corrosion products)and EIS results revealed an improvement of corrosion resistance after laser treatment for 48 *** was found a two-layer structure developed after 2 h immersion on both the untreated and laser-treated alloys,but the sequence of forming the two layers was opposite and greatly influenced by the laser-treated *** time-evolution corrosion processes on the untreated and laser-treated alloys were discussed,providing a better understanding of corrosion behavior of biodegradable Mg alloys modified by excimer laser.

关键词： Magnesium Biodegradable implant Excimer laser simulated body fluid Corrosion EIS

Formation of Apatite in simulated body fluid

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Journal of Wuhan University of Technology(Materials Science) 2002年第4期17卷 44-46页

作者：樊东辉 Department of Material Science and Engineering Tongji University Shanghai China Wuhan University of Technology Wuhan China

It is confirmed that the essential condition for glasses and glass-ceramics to bond to living bone is the formation of an apatite layer on their surfaces in the *** is proposed that a hydrated silica formed on the surfaces of these materials in the body plays an important role in forming the surface apatite layer,which has not been proved *** is shown experimentally that a pure hydrated silica gel can induce the apatite formation on its surface in a simulated body fluid when its starting pH is increased from 7.2 to 7.4.

关键词： apatite formation silica gel simulated body fluid

Corrosion fatigue of the extruded Mg-Zn-Y-Nd alloy in simulated body fluid

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Journal of Magnesium and Alloys 2020年第1期8卷 231-240页

作者： Mengyao Liu Jianfeng Wang Shijie Zhu Yabo Zhang Yufeng Sun Liguo Wang Shaokang Guan School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Henan Key Laboratory of Advanced Magnesium Alloys Zhengzhou 450002China Key Laboratory of Advanced Materials Processing&Mold Ministry of Education Zhengzhou 450002China

Magnesium alloys were considered to be used as biodegradable implants due to their biocompatibility,biodegradability and ***,under the simultaneous action of corrosive environment and mechanical loading in human body,magnesium alloys are easy to be affected by corrosion fatigue and stress corrosion *** this work,the fatigue behavior of the extruded Mg-Zn-Y-Nd alloy used for vascular stents was studied both in air and in simulated body fluid(SBF).It was revealed that the fatigue limit of as-extruded Mg-Zn-Y-Nd alloy in air is about 65 MPa at 10^7 cycles,while there is no limit in SBF and shows a linear relationship between the fatigue life and stress *** fatigue crack source in air was formed by the inclusions and ***,the stress corrosion and hydrogen embrittlement are the main reasons for the formation of the fatigue initial crack source in SBF.

关键词： Biodegradable magnesium alloy Corrosion fatigue simulated body fluid Fatigue crack source

Effect of corrosion on mechanical behaviors of Mg-Zn-Zr alloy in simulated body fluid

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Frontiers of Materials Science 2014年第3期8卷 264-270页

作者： Rong SONG De-Bao LIU Yi-Chi LIU Wen-Bo ZHENG Yue ZHAO Min-Fang CHEN School of Materials Science and Engineering Tianjin University of Technology Tianjin 300384 China School of Mechanical Materials and Mechatronic Engineering Faculty of Engineering and Information Sciences University of Wollongong Northfield Ave Wollongong NSW 2522 Australia

The main purpose of this paper is to investigate the effect of corrosion on mechanical behaviors of the Mg-Zn-Zr alloy immersed in simulated body fluid （SBF） with different immersion times. The corrosion behavior of the materials in SBF was determined by immersion tests. The surfaces of the corroded alloys were examined by SEM. The tensile samples of the extruded Mg-2Zn-0.8Zr magnesium alloy were immersed in the SBF for 0, 4, 7, 10, 14, 21 and 28 d. The tensile mechanical behaviors of test samples were performed on an electronic tensile testing machine. SEM was used to observe the fracture morphology. It was found that with extension of the immersion time, the ultimate tensile strength （UTS）, yield strength （YS） and elongation （EL） of the Mg-2Zn-0.8Zr samples decreased rapidly at first and then decreased slowly. The main fracture mechanism of the alloy transformed from ductile fracture to cleavage fracture with the increasing immersion times, which can be attributed to stress concentration and embrittlement caused by pit corrosion.

关键词： magnesium alloy simulated body fluid mechanical property fracture mechanism

Effects of immersion in simulated body fluid on the fatigue and corrosion behavior of biodegradable WE54 magnesium alloy

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Journal of Central South University 2024年第11期31卷 3996-4012页

作者： N.ASGHARINEZHAD BALOOCHI A.R.EIVANI M.R.ABOUTALEBI H.R.JAFARIAN School of Metallurgy and Materials Engineering Iran University of Science and Technology(IUST)TehranIran

Fatigue and tensile behaviors of homogenized WE 54 magnesium alloy before and after immersion in simulated body fluid(SBF)were *** to the tensile test,the alloy without immersion in SBF solution has the highest tensile strength of 278 MPa,which decreased to 190 MPa after 336 h of immersion..The fatigue life of the homogenized WE 54 magnesium alloy before immersion in the SBF solution under a constant stress of 15 MPa is 3598 ***,the fatigue life of the alloy decreased to 453 cycles after 336 h of immersion in the SBF solution under the same *** of the fracture surface of the samples by SEM reveals that the origin of the fatigue crack before immersion is micro-pores and *** corrosion pits and cracks are the main reasons for forming the initial fatigue crack after ***,the results obtained from practical work were evaluated and compared to theoretical *** area of the hysteresis loops of the samples after the fatigue test,determined using Triangles and Monte Carlo methods,decreased from 4954.5 MPa and 4842.9 MPa before immersion to 192.0 MPa and 175.8 MPa after 336 h of immersion,respectively.

关键词： WE54 magnesium alloy biodegradability corrosion fatigue simulated body fluid

Evaluation of Bioactive Properties of α and β Wollastonite Bioceramics Soaked in a simulated body fluid

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Journal of Biomaterials and Nanobiotechnology 2018年第3期9卷 263-276页

作者： Luis A.Nunez-Rodriguez Martin A.Encinas-Romero Agustin Gomez-Alvarez Jesus L.Valenzuela-Garcia Guillermo C.Tiburcio-Munive Posgrado en Ciencias de la Ingenieria:Ingenieria Quimica Universidad de SonoraHermosilloMexico Departamento de Ingenieria Quimica y Metalurgia Universidad de SonoraHermosilloMexico

Dense natural wollastonite bioceramics (CaSiO3) were prepared by a sintering method, varying the pressing load and sintering temperature, in order to obtain different phases of wollastonite, and different physical properties in the materials. The products were characterized by TGA-DTA, XRD, FT-IR, SEM-EDS, TEM and XPS techniques. The results indicate the presence of two polymorphic phases of wollastonite, the β-wollastonite and α-wollastonite with a transition temperature of the β phase to α phase at approximately 1250℃. These materials were soaked in a simulated body fluid (SBF) during 1, 2 and 3 weeks, to study their solubility and bioactivity. The effect of different wollastonite phases on the solubility of Ca and Si, as well as the capacity of producing layers of “newly formed apatite” on the surfaces of these materials in SBF solution were analyzed.

关键词： Bioceramics Wollastonite simulated body fluid Bioactivity