The influences of rare earth elements（cerium and lanthanum） on the microstructure and phases of Al-3.0 wt%Mg alloys used for electromagnetic shielding wire were characterized by scanning electron microscopy（SEM）, ...The influences of rare earth elements（cerium and lanthanum） on the microstructure and phases of Al-3.0 wt%Mg alloys used for electromagnetic shielding wire were characterized by scanning electron microscopy（SEM）, energy-dispersive spectroscopy（EDS）, X-ray diffraction（XRD） and differential scanning calorimetry（DSC）. The mechanical properties and electrical resistivity were also investigated. The results indicated that a certain content of rare earth could improve the purification of the aluminum molten, enhance the strength, and reduce the electrical resistivity of Al-3.0 wt%Mg alloys. The strength reached the top value when RE content was 0.3 wt% while the alloy with 0.2 wt% RE addition had the smallest electrical resistivity. The elongation varied little when RE addition was no more than 0.2 wt%. But the excessive addition of rare earth would be harmful to the microstructure and properties of Al-3.0 wt%Mg alloys.展开更多
The reduction of nitrite at Au or carbon electrode in-H_2SO_4 was found to follow achemical-electrochemical (CE) mechanism with a very thin (4×10(-8)cm) preceding reaction zone.It was proposed and experimentally ...The reduction of nitrite at Au or carbon electrode in-H_2SO_4 was found to follow achemical-electrochemical (CE) mechanism with a very thin (4×10(-8)cm) preceding reaction zone.It was proposed and experimentally verified that for such kind of electrode processes the totalreaction the could be effectively enhanced by using electrodes with increased true surface area.such as porous electrodes. As a combination of porous electrode and microelectrode, the powdermicroclectrode shows excellent performance for nitrite detection.展开更多
基金Funded by the National Natural Science Foundation of China(No.51379070)the Fundamental Research Funds for the Central Universities(No.2017B40314)
文摘The influences of rare earth elements（cerium and lanthanum） on the microstructure and phases of Al-3.0 wt%Mg alloys used for electromagnetic shielding wire were characterized by scanning electron microscopy（SEM）, energy-dispersive spectroscopy（EDS）, X-ray diffraction（XRD） and differential scanning calorimetry（DSC）. The mechanical properties and electrical resistivity were also investigated. The results indicated that a certain content of rare earth could improve the purification of the aluminum molten, enhance the strength, and reduce the electrical resistivity of Al-3.0 wt%Mg alloys. The strength reached the top value when RE content was 0.3 wt% while the alloy with 0.2 wt% RE addition had the smallest electrical resistivity. The elongation varied little when RE addition was no more than 0.2 wt%. But the excessive addition of rare earth would be harmful to the microstructure and properties of Al-3.0 wt%Mg alloys.
文摘The reduction of nitrite at Au or carbon electrode in-H_2SO_4 was found to follow achemical-electrochemical (CE) mechanism with a very thin (4×10(-8)cm) preceding reaction zone.It was proposed and experimentally verified that for such kind of electrode processes the totalreaction the could be effectively enhanced by using electrodes with increased true surface area.such as porous electrodes. As a combination of porous electrode and microelectrode, the powdermicroclectrode shows excellent performance for nitrite detection.
