Binary bright Ni-Co alloy films were electro- deposited on titanium in the chloride-sulfate electrolytes. The influences of Co2＋ concentration, current density, and temperature on the Ni-Co alloy films electrodeposit...Binary bright Ni-Co alloy films were electro- deposited on titanium in the chloride-sulfate electrolytes. The influences of Co2＋ concentration, current density, and temperature on the Ni-Co alloy films electrodeposition were investigated. The films were analyzed by scanning electron microscope （SEM）, energy dispersive spectros- copy （EDS）, and X-ray diffraction （XRD）. Cathodic polarization for Ni-Co codeposition was performed on Ti working electrodes. With the increase of Co2＋ concentra- tion, the Ni content in the films decreases and the current efficiency increases slightly. The Ni content increases with the increase of temperature, while it decreases with the increase of current density to a minimum and then increases. The cathodic reduction peak potential is mea- sured to be -1.34 V. Anomalous deposition is found to occur in the Ni-Co codeposition. The SEM of Ni-Co alloy films shows that hydroxide particles are not present on the surface and fine grain, compact, smooth, and bright Ni--Co alloy films are obtained. The XRD result indicates that the deposited Ni-Co alloy film is Ni-solid solution with a face- centered cubic in structure.展开更多
Ti/Cu/N coatings with different Cu contents were deposited on titanium alloy surface by the DC magnetron sputtering technique.XPS and FESEM were employed to characterize the composition and structure of the coating on...Ti/Cu/N coatings with different Cu contents were deposited on titanium alloy surface by the DC magnetron sputtering technique.XPS and FESEM were employed to characterize the composition and structure of the coating on the Ti6A14 V substrates.In addition,The adhesion force,friction,and wear properties of the Ti/Cu/N coatings were investigated.The experimental results showed that the coarse particles of the coatings would grow more and the surface roughness increased with the increase of copper content in the coatings;The coatings showed a strong adhesion force;The friction coefficient of the coating of the samples was less than the substrate,reaching 0.19 at least.The wear resistance of the coatings could be improved by optimizing and controlling the relative content of Ti,Cu,N elements on the titanium alloy surface,especially the 10.98 at%contents of the copper.The sample C2 kept the best wear resistance.展开更多
The current research is devoted to the study of the modification of the titanium implants by the micro-arc oxidation with bioactive calcium phosphate coatings containing Ag or Sr and Si elements.The coatings’microstr...The current research is devoted to the study of the modification of the titanium implants by the micro-arc oxidation with bioactive calcium phosphate coatings containing Ag or Sr and Si elements.The coatings’microstructure,phase composition,morphology,physicochemical and biological properties were examined by scanning electron microscopy(SEM),transmission electron microscopy(TEM),energy-dispersive X-ray spectroscopy(EDX)and X-ray diffraction(XRD).Ag-containing and Sr-Si-incorporated coatings were formed in alkaline and acid electrolytes,respectively.The formation of the coatings occurred at different ranges of the applied voltages,which led to the significant difference in the coatings properties.The trace elements Ag,Sr and Si participated intensively in the plasma-chemical reactions of the micro-arc coatings formation.Ag-containing coatings demonstrated strong antibacterial effect against Staphylococcus aureus AТСС6538-P.MTT in vitro test with 3T3-L1 fibroblasts showed no cytotoxicity appearance on Sr-Si-incorporated coatings.展开更多
基金financially supported by the National Natural Science Foundation of China(No.21273190)the Opening Fund from Hunan Province Key Laboratory of Xiangnan Rare-Precious Metals Compounds and Applications(No.2012XGJSYB01)
文摘Binary bright Ni-Co alloy films were electro- deposited on titanium in the chloride-sulfate electrolytes. The influences of Co2＋ concentration, current density, and temperature on the Ni-Co alloy films electrodeposition were investigated. The films were analyzed by scanning electron microscope （SEM）, energy dispersive spectros- copy （EDS）, and X-ray diffraction （XRD）. Cathodic polarization for Ni-Co codeposition was performed on Ti working electrodes. With the increase of Co2＋ concentra- tion, the Ni content in the films decreases and the current efficiency increases slightly. The Ni content increases with the increase of temperature, while it decreases with the increase of current density to a minimum and then increases. The cathodic reduction peak potential is mea- sured to be -1.34 V. Anomalous deposition is found to occur in the Ni-Co codeposition. The SEM of Ni-Co alloy films shows that hydroxide particles are not present on the surface and fine grain, compact, smooth, and bright Ni--Co alloy films are obtained. The XRD result indicates that the deposited Ni-Co alloy film is Ni-solid solution with a face- centered cubic in structure.
基金Funded by the Science and Technology Project of Shanxi Province(No.2015031006-2)the NSFC-Shanxi Coal Based Low Carbon Joint Fund Focused on Supporting Project(No.U1510205)the New Century Excellent Talents(No.NECT-12-1038)
文摘Ti/Cu/N coatings with different Cu contents were deposited on titanium alloy surface by the DC magnetron sputtering technique.XPS and FESEM were employed to characterize the composition and structure of the coating on the Ti6A14 V substrates.In addition,The adhesion force,friction,and wear properties of the Ti/Cu/N coatings were investigated.The experimental results showed that the coarse particles of the coatings would grow more and the surface roughness increased with the increase of copper content in the coatings;The coatings showed a strong adhesion force;The friction coefficient of the coating of the samples was less than the substrate,reaching 0.19 at least.The wear resistance of the coatings could be improved by optimizing and controlling the relative content of Ti,Cu,N elements on the titanium alloy surface,especially the 10.98 at%contents of the copper.The sample C2 kept the best wear resistance.
基金supported by the Fundamental Research Program of the State Academies of Sciences for 2013-2020,direction of research Ⅲ.23.2.
文摘The current research is devoted to the study of the modification of the titanium implants by the micro-arc oxidation with bioactive calcium phosphate coatings containing Ag or Sr and Si elements.The coatings’microstructure,phase composition,morphology,physicochemical and biological properties were examined by scanning electron microscopy(SEM),transmission electron microscopy(TEM),energy-dispersive X-ray spectroscopy(EDX)and X-ray diffraction(XRD).Ag-containing and Sr-Si-incorporated coatings were formed in alkaline and acid electrolytes,respectively.The formation of the coatings occurred at different ranges of the applied voltages,which led to the significant difference in the coatings properties.The trace elements Ag,Sr and Si participated intensively in the plasma-chemical reactions of the micro-arc coatings formation.Ag-containing coatings demonstrated strong antibacterial effect against Staphylococcus aureus AТСС6538-P.MTT in vitro test with 3T3-L1 fibroblasts showed no cytotoxicity appearance on Sr-Si-incorporated coatings.
