采用浸泡酸洗法研究温度对锆合金酸洗速率影响,并分析锆合金酸洗释热系数。结果表明:温度对酸洗速率具有指数影响关系;在20~60℃温度范围内,每增加10℃,酸洗速率提高2.0~2.5倍,锆合金酸洗频率因子和反应活化能约为1.18×10^(12)和70...采用浸泡酸洗法研究温度对锆合金酸洗速率影响,并分析锆合金酸洗释热系数。结果表明:温度对酸洗速率具有指数影响关系;在20~60℃温度范围内,每增加10℃,酸洗速率提高2.0~2.5倍,锆合金酸洗频率因子和反应活化能约为1.18×10^(12)和70 k J/mol。锆合金酸洗为放热反应,酸洗中伴随温度升高,其释热系数约为760 k J/mol。展开更多
The mechanical and physical properties of biodegradable magnesium(Mg)alloys make them suitable for temporary orthopaedic implants.The success of these alloys depends on their performance in the physiological environme...The mechanical and physical properties of biodegradable magnesium(Mg)alloys make them suitable for temporary orthopaedic implants.The success of these alloys depends on their performance in the physiological environment.In the present work,surface modification of Mg-Ca binary alloy by acid pickling for better biomineralization and controlled biodegradation is explored.The corrosion rates of nitric and phosphoric acid treated samples were analysed by conducting electrochemical corrosion tests.In vitro degradation behaviour was studied using immersion test in simulated body fluid(SBF).The sample surfaces were characterized using scanning electron microscope(SEM),energy dispersive X-ray spectroscopy(EDS),Fourier transform infrared spectroscopy(FTIR)and X-ray photoelectron spectroscopy(XPS).It is seen that acid pickling leads to significant improvement in biomineralization and develop in situ calcium phosphate(Ca P)coating on the sample surfaces.In addition,the treated samples recorded a reduced degradation rate in the SBF compared to untreated samples.Thus,acid pickling is suggested as an effective surface treatment method to tailor the biomineralization and degradation behaviour of the Mg-Ca alloy in the physiological environment.展开更多
文摘采用浸泡酸洗法研究温度对锆合金酸洗速率影响,并分析锆合金酸洗释热系数。结果表明:温度对酸洗速率具有指数影响关系;在20~60℃温度范围内,每增加10℃,酸洗速率提高2.0~2.5倍,锆合金酸洗频率因子和反应活化能约为1.18×10^(12)和70 k J/mol。锆合金酸洗为放热反应,酸洗中伴随温度升高,其释热系数约为760 k J/mol。
基金financial grant No.5/4–5/3ORTHO/2019-NCD-I Dt.16–09–2019 from Indian Council of Medical Research(ICMR)the grant from DST-FIST-No.SR/FST/ETI-388/2015,Govt.of India used for setting up 3D Profilometer facility at NIT Calicut。
文摘The mechanical and physical properties of biodegradable magnesium(Mg)alloys make them suitable for temporary orthopaedic implants.The success of these alloys depends on their performance in the physiological environment.In the present work,surface modification of Mg-Ca binary alloy by acid pickling for better biomineralization and controlled biodegradation is explored.The corrosion rates of nitric and phosphoric acid treated samples were analysed by conducting electrochemical corrosion tests.In vitro degradation behaviour was studied using immersion test in simulated body fluid(SBF).The sample surfaces were characterized using scanning electron microscope(SEM),energy dispersive X-ray spectroscopy(EDS),Fourier transform infrared spectroscopy(FTIR)and X-ray photoelectron spectroscopy(XPS).It is seen that acid pickling leads to significant improvement in biomineralization and develop in situ calcium phosphate(Ca P)coating on the sample surfaces.In addition,the treated samples recorded a reduced degradation rate in the SBF compared to untreated samples.Thus,acid pickling is suggested as an effective surface treatment method to tailor the biomineralization and degradation behaviour of the Mg-Ca alloy in the physiological environment.
