The corrosion process of tinplate in 0.5 mol/L NaCl solution was investigated using the electrochemical impedance spectroscopy（EIS）,and the morphology and structure of the corrosion products were characterized by sc...The corrosion process of tinplate in 0.5 mol/L NaCl solution was investigated using the electrochemical impedance spectroscopy（EIS）,and the morphology and structure of the corrosion products were characterized by scanning electron microscope（SEM）,scanning probe microscopy（SPM）,X-ray diffraction（XRD） and X-ray photoelectron spectroscopy（XPS）.The results showed that the resistance of tin coating,Rc,was essentially constant but the charge transfer resistance,Rct,decreased by 2 orders of magnitude,which indicated that the tin coating was not seriously corroded while the carbon steel substrate was corroded continuously.The corrosion of tinplate in 0.5 mol/L NaCl solution was mainly the dissolution of carbon steel substrate because of the defects in the tin layer and the corrosion product was mainly γ-FeOOH.展开更多
The corrosion behavior of a copper-based shape memory alloy(Cu-Al-Mn-Zn-Zr) in 3.5 wt.% Na Cl solution was investigated by means of potentiodynamic polarization measurements, electrochemical impedance spectroscopy(EIS...The corrosion behavior of a copper-based shape memory alloy(Cu-Al-Mn-Zn-Zr) in 3.5 wt.% Na Cl solution was investigated by means of potentiodynamic polarization measurements, electrochemical impedance spectroscopy(EIS) and X-ray photoelectron spectroscopy(XPS). At the beginning of corrosion, oxidation products formed on the surface of the shape memory alloy and constantly covered the reaction surface, resulting in the decrease of corrosion rate. After 4 d of immersion in NaCl solution, the corrosion product layer became thick and porous, leading to the increase of corrosion rate, and the corrosion reaction mechanism changed from polarization control to diffusion control. The diffusion impedance increased with increasing thickness of the oxide layer for the samples immersed in NaCl solution for 6-15 d. During the whole corrosion process, the reaction mechanism of the alloy changed and the corrosion resistance was improved continuously. The corrosion products mainly contained CuO, ZnO, Al2O3, MnO/Mn2O3, MnO2 and Al(OH)3. Transition of the corrosion products from Cu2O to CuO and Al2O3 to Al(OH)3 occurred during corrosion.展开更多
Y99-61677-205 0007330薄膜退耦电容器的建模与模拟=Modeling and simula-tion of thin film decoupling capacitors[会,英]/Chen,K.Y.& Brown,W.D.//Characterization of flip-chipCMOS ASIC simultaneous switching noise on mult...Y99-61677-205 0007330薄膜退耦电容器的建模与模拟=Modeling and simula-tion of thin film decoupling capacitors[会,英]/Chen,K.Y.& Brown,W.D.//Characterization of flip-chipCMOS ASIC simultaneous switching noise on multilayerorganic and ceramic BGA/CGA packages.—205～208(EG)对具有新型结构的薄膜退耦电容器的特性进行了模拟。对接触形状、电介质及金属层厚度对阻抗行为的影响进行了研究。模拟表明薄膜电容器具有优良的高频特性。展开更多
基金Project(2011CB610500) supported by the National Basic Research Program of China
文摘The corrosion process of tinplate in 0.5 mol/L NaCl solution was investigated using the electrochemical impedance spectroscopy（EIS）,and the morphology and structure of the corrosion products were characterized by scanning electron microscope（SEM）,scanning probe microscopy（SPM）,X-ray diffraction（XRD） and X-ray photoelectron spectroscopy（XPS）.The results showed that the resistance of tin coating,Rc,was essentially constant but the charge transfer resistance,Rct,decreased by 2 orders of magnitude,which indicated that the tin coating was not seriously corroded while the carbon steel substrate was corroded continuously.The corrosion of tinplate in 0.5 mol/L NaCl solution was mainly the dissolution of carbon steel substrate because of the defects in the tin layer and the corrosion product was mainly γ-FeOOH.
基金financial support from the National Natural Science Foundation of China (51601227)Natural Science Foundation of Hunan Province,China (2018JJ3650)the Project of Innovation-Driven Plan and the Project of State Key Laboratory of Powder Metallurgy,Central South University,China。
文摘The corrosion behavior of a copper-based shape memory alloy(Cu-Al-Mn-Zn-Zr) in 3.5 wt.% Na Cl solution was investigated by means of potentiodynamic polarization measurements, electrochemical impedance spectroscopy(EIS) and X-ray photoelectron spectroscopy(XPS). At the beginning of corrosion, oxidation products formed on the surface of the shape memory alloy and constantly covered the reaction surface, resulting in the decrease of corrosion rate. After 4 d of immersion in NaCl solution, the corrosion product layer became thick and porous, leading to the increase of corrosion rate, and the corrosion reaction mechanism changed from polarization control to diffusion control. The diffusion impedance increased with increasing thickness of the oxide layer for the samples immersed in NaCl solution for 6-15 d. During the whole corrosion process, the reaction mechanism of the alloy changed and the corrosion resistance was improved continuously. The corrosion products mainly contained CuO, ZnO, Al2O3, MnO/Mn2O3, MnO2 and Al(OH)3. Transition of the corrosion products from Cu2O to CuO and Al2O3 to Al(OH)3 occurred during corrosion.
文摘Y99-61677-205 0007330薄膜退耦电容器的建模与模拟=Modeling and simula-tion of thin film decoupling capacitors[会,英]/Chen,K.Y.& Brown,W.D.//Characterization of flip-chipCMOS ASIC simultaneous switching noise on multilayerorganic and ceramic BGA/CGA packages.—205～208(EG)对具有新型结构的薄膜退耦电容器的特性进行了模拟。对接触形状、电介质及金属层厚度对阻抗行为的影响进行了研究。模拟表明薄膜电容器具有优良的高频特性。
