The degradation behavior of biodegradable Mg alloys has become a research hotspot in the fields about biodegradable metallic materials.While the most of the related publications mainly focused on the degradation rate ...The degradation behavior of biodegradable Mg alloys has become a research hotspot in the fields about biodegradable metallic materials.While the most of the related publications mainly focused on the degradation rate of Mg-based materials,but rare to care about the changes of their mechanical properties during the immersion period,which can significantly affect their service performance.The link between residual strength and Mg degradation is not appreciated enough.In this work,a series media were constructed based on Hanks’solution,the effects of inorganic ions on the degradation rate and mechanical integrity of Mg-Zn-Y-Nd alloy were investigated.The results indicated that the degradation behavior of Mg alloy was mainly controlled by degradation products and there is no direct correspondence between the degradation rate change and mechanical integrity of Mg alloy.The relevant findings are beneficial for selecting the monitoring index in Mg corrosion tests and evaluating the service reliability of Mg alloys for biomedical applications.展开更多
In recent years magnesium alloys have been studied intensively with a view to their potential use in bioresorbable medical implants.In the present work the microstructure and the corrosion properties of a new bioresor...In recent years magnesium alloys have been studied intensively with a view to their potential use in bioresorbable medical implants.In the present work the microstructure and the corrosion properties of a new bioresorbable Mg-4 wt%Ga-4 wt%Zn alloy and its variants with low Ca,Nd or Y additions were investigated.These alloys are of interest due to the efficacy of gallium as an element inhibiting bone resorption,osteoporosis,Paget's disease,and other illnesses.A severe plastic deformation technique of equal channel angular pressing(ECAP)was shown to provide the alloys with favorable mechanical properties.In addition,a desirable low rate of degradation in a simulated body fluid(Hanks'solution)was achieved.展开更多
Hydroxyapatite （HA, Ca10（PO4）6（OH）2） coating was fabricated on pure Ti （TA2） by laser cladding technology. The phase structure, microstructure, microhardness and electrochemical behavior of the laser cladded H...Hydroxyapatite （HA, Ca10（PO4）6（OH）2） coating was fabricated on pure Ti （TA2） by laser cladding technology. The phase structure, microstructure, microhardness and electrochemical behavior of the laser cladded HA coating in artificial body fluid were investigated. The results show that the HA coating is mainly composed of highly crystallized HA. A transitional layer between HA coating and Ti substrate is formed. Microhardness measurement shows the gradually increasing of microhardness from 150 HV at TA2 substrate to 600 HV at transitional layer, and followed by a decreasing to 400 HV at HA coated layer. Electrochemical corrosion tests show that the HA coating has higher open circuit potential , lower corrosion current density and corrosion rate in comparison to the TA2 substrate.展开更多
采用浸泡实验、阳极极化曲线和电化学交流阻抗(EIS)测试技术,并结合XRD和SEM分析手段对新型生物可降解Fe-Mn合金在37℃人工模拟体液-Hanks溶液中的电化学腐蚀行为进行了研究,并与Fe-C合金比较.研究结果表明:在37℃Hanks溶液中浸泡5天后,...采用浸泡实验、阳极极化曲线和电化学交流阻抗(EIS)测试技术,并结合XRD和SEM分析手段对新型生物可降解Fe-Mn合金在37℃人工模拟体液-Hanks溶液中的电化学腐蚀行为进行了研究,并与Fe-C合金比较.研究结果表明:在37℃Hanks溶液中浸泡5天后,Fe-Mn合金表面的腐蚀产物主要为锰的氧化物Mn_3O_4和MnO_2,表面发生均匀腐蚀.Fe-Mn合金在37℃Hanks溶液中的阳极极化行为是活化溶解过程,随着Mn含量由15%增加到30%,合金的自腐蚀电位Ecorr下降,自腐蚀电流密度icorr升高,与Fe-C合金相比,自腐蚀电位Ecorr从-650 m V下降至-800 m V以下,耐蚀性能显著降低.Fe-25Mn合金在37℃Hanks溶液中的容抗弧直径小于Fe-C合金,双电层电荷转移电阻R由420.5Ω·cm2减小为327.0Ω·cm2,降解速度提高.展开更多
基金support from the Na-tional Key Research and Development Program of China(2021YFC2400703)the Key Projects of the Joint Fund of the National Natural Science Foundation of China(U1804251)support from Natural Science Foundation of Henan Provincial(222300420309).
文摘The degradation behavior of biodegradable Mg alloys has become a research hotspot in the fields about biodegradable metallic materials.While the most of the related publications mainly focused on the degradation rate of Mg-based materials,but rare to care about the changes of their mechanical properties during the immersion period,which can significantly affect their service performance.The link between residual strength and Mg degradation is not appreciated enough.In this work,a series media were constructed based on Hanks’solution,the effects of inorganic ions on the degradation rate and mechanical integrity of Mg-Zn-Y-Nd alloy were investigated.The results indicated that the degradation behavior of Mg alloy was mainly controlled by degradation products and there is no direct correspondence between the degradation rate change and mechanical integrity of Mg alloy.The relevant findings are beneficial for selecting the monitoring index in Mg corrosion tests and evaluating the service reliability of Mg alloys for biomedical applications.
基金The authors gratefully acknowledge financial support from the Ministry of Science and Higher Education of the Russian Federation under the Increasing Competitiveness Program of NUST"MISiS"(No.K2-2019-008)implemented according to the governmental decree N 211 dated 16 March 2013.
文摘In recent years magnesium alloys have been studied intensively with a view to their potential use in bioresorbable medical implants.In the present work the microstructure and the corrosion properties of a new bioresorbable Mg-4 wt%Ga-4 wt%Zn alloy and its variants with low Ca,Nd or Y additions were investigated.These alloys are of interest due to the efficacy of gallium as an element inhibiting bone resorption,osteoporosis,Paget's disease,and other illnesses.A severe plastic deformation technique of equal channel angular pressing(ECAP)was shown to provide the alloys with favorable mechanical properties.In addition,a desirable low rate of degradation in a simulated body fluid(Hanks'solution)was achieved.
基金Funded by the National Natural Science Foundation of China(No. 50971102)Shannxi Province "13115" Key Science and Technology Project (No. 2010ZDKG-51)
文摘Hydroxyapatite （HA, Ca10（PO4）6（OH）2） coating was fabricated on pure Ti （TA2） by laser cladding technology. The phase structure, microstructure, microhardness and electrochemical behavior of the laser cladded HA coating in artificial body fluid were investigated. The results show that the HA coating is mainly composed of highly crystallized HA. A transitional layer between HA coating and Ti substrate is formed. Microhardness measurement shows the gradually increasing of microhardness from 150 HV at TA2 substrate to 600 HV at transitional layer, and followed by a decreasing to 400 HV at HA coated layer. Electrochemical corrosion tests show that the HA coating has higher open circuit potential , lower corrosion current density and corrosion rate in comparison to the TA2 substrate.
文摘采用浸泡实验、阳极极化曲线和电化学交流阻抗(EIS)测试技术,并结合XRD和SEM分析手段对新型生物可降解Fe-Mn合金在37℃人工模拟体液-Hanks溶液中的电化学腐蚀行为进行了研究,并与Fe-C合金比较.研究结果表明:在37℃Hanks溶液中浸泡5天后,Fe-Mn合金表面的腐蚀产物主要为锰的氧化物Mn_3O_4和MnO_2,表面发生均匀腐蚀.Fe-Mn合金在37℃Hanks溶液中的阳极极化行为是活化溶解过程,随着Mn含量由15%增加到30%,合金的自腐蚀电位Ecorr下降,自腐蚀电流密度icorr升高,与Fe-C合金相比,自腐蚀电位Ecorr从-650 m V下降至-800 m V以下,耐蚀性能显著降低.Fe-25Mn合金在37℃Hanks溶液中的容抗弧直径小于Fe-C合金,双电层电荷转移电阻R由420.5Ω·cm2减小为327.0Ω·cm2,降解速度提高.
