The effects of cerium nitrite on corrosion behaviors of carbon steel in simulated concrete pore solutions were studied with the methods of linear polarization, electrochemical impedance spectroscopy and surface analys...The effects of cerium nitrite on corrosion behaviors of carbon steel in simulated concrete pore solutions were studied with the methods of linear polarization, electrochemical impedance spectroscopy and surface analysis. In pore solutions in the presence of Ce（NO3）3？6H2O, the corrosion potential, polarization resistance and impedance of carbon steel obviously increased in contrast to the situation in the absence of cerium salts. The pore solution with [NO2-] / [Cl-] = 0.3 and 0.1% Ce（NO3）3？6H2O, carbon steel shows better corrosion resistance than that in the pore solution with [NO2-] / [Cl-] = 0.6, which indicates that a small amount of Ce（NO3）3？6H2O in pore solutions can effectively promote passivation of the steel and reduce the threshold [NO2-] / [Cl-] ratio for corrosion control. The surface layer formed in cerium salt containing pore solutions is more compact and smooth and 1.36%Ce is examined on the sample surface. The addition of 0.1% Ce（NO3）3？6H2O in pore solutions can decrease the corrosion rate of steel in pore solutions and has little influence on pH change of the solutions. However, more cerium nitrate addition above 0.1% may result in pH decrease of the solution.展开更多
High resolution magic angle spinning （MAS）-^1H nuclear magnetic resonance （NMR） spectroscopic-based metabonomic approach was applied to the investigation on the acute biochemical effects of Ce（NO3）3. Male Wistar...High resolution magic angle spinning （MAS）-^1H nuclear magnetic resonance （NMR） spectroscopic-based metabonomic approach was applied to the investigation on the acute biochemical effects of Ce（NO3）3. Male Wistar rats were administrated with various doses of Ce（NO3）3（2, 10, and 50 mg·kg^- 1 body weight）, and MAS ^1H NMR spectra of intact liver and kidney tissues were analyzed using principal component analysis to extract toxicity information. The biochemical effects of Ce（NO3）3 were characterized by the increase of triglycerides and lactate and the decrease of glycogen in rat liver tissue, together with an elevation of the triglyceride level and a depletion of glycerophosphocholine and betaine in kidney tissues. The target lesions of Ce（NO3）3 on liver and kidney were found by MAS NMR-based metabonomic method. This study demonstrates that the combination of MAS ^1H NMR and pattern recognition analysis can be an effective method for studies of biochemical effects of rare earths.展开更多
Mice were watered with cerous nitrate solution (2, 20, 200 mg·kg-1) according to daily drinking water volume for 50 days and the effects of cerous nitrate on nonspecific immunity in mice were investigated. The re...Mice were watered with cerous nitrate solution (2, 20, 200 mg·kg-1) according to daily drinking water volume for 50 days and the effects of cerous nitrate on nonspecific immunity in mice were investigated. The results showed that the total number of peripheral white blood cell, the clearance rate of charcoal particles, the indices of thymus and spleen were increased on different degrees, and associated with the watering dose, noting that these indices were increased significantly by cerous nitrate at a dose of 20 mg·kg-1 compared with control group. Therefore, it was concluded that the nonspecific immunity could be improved by rare earth Ce in mice.展开更多
In this paper,the sustainable Ce-Mn chemical conversion coating was fabricated on 6063 aluminium alloy by means of Ce(NO3)3 and KMnO4 as the inhibitors and NaF as the accelerator.The morphologies,composition and valen...In this paper,the sustainable Ce-Mn chemical conversion coating was fabricated on 6063 aluminium alloy by means of Ce(NO3)3 and KMnO4 as the inhibitors and NaF as the accelerator.The morphologies,composition and valence state of the coating were analyzed by scanning electron microscopy(SEM),energy dispersive spectrometry(EDS) and X-ray photoelectron spectroscopy(XPS),respectively.The results indicated that the Ce-Mn conversion coating was formed.The anticorrosion of the coating was evaluated in 3.5 wt.% NaCl aqueous solution at room temperature by using polarization curve and electrochemical impedance spectroscopy(EIS).It indicated that the treated surface presented better anticorrosion behavior in chloride media than on the original material surface.The corrosion resistance of Ce-Mn conversion coating was about equal to the trivalent chromium conversion coating.展开更多
基金the National Natural Science Foundation of China(No.50731004)Technology Support Programs of China(No.2007BAB27B04-N43CTT)
文摘The effects of cerium nitrite on corrosion behaviors of carbon steel in simulated concrete pore solutions were studied with the methods of linear polarization, electrochemical impedance spectroscopy and surface analysis. In pore solutions in the presence of Ce（NO3）3？6H2O, the corrosion potential, polarization resistance and impedance of carbon steel obviously increased in contrast to the situation in the absence of cerium salts. The pore solution with [NO2-] / [Cl-] = 0.3 and 0.1% Ce（NO3）3？6H2O, carbon steel shows better corrosion resistance than that in the pore solution with [NO2-] / [Cl-] = 0.6, which indicates that a small amount of Ce（NO3）3？6H2O in pore solutions can effectively promote passivation of the steel and reduce the threshold [NO2-] / [Cl-] ratio for corrosion control. The surface layer formed in cerium salt containing pore solutions is more compact and smooth and 1.36%Ce is examined on the sample surface. The addition of 0.1% Ce（NO3）3？6H2O in pore solutions can decrease the corrosion rate of steel in pore solutions and has little influence on pH change of the solutions. However, more cerium nitrate addition above 0.1% may result in pH decrease of the solution.
文摘High resolution magic angle spinning （MAS）-^1H nuclear magnetic resonance （NMR） spectroscopic-based metabonomic approach was applied to the investigation on the acute biochemical effects of Ce（NO3）3. Male Wistar rats were administrated with various doses of Ce（NO3）3（2, 10, and 50 mg·kg^- 1 body weight）, and MAS ^1H NMR spectra of intact liver and kidney tissues were analyzed using principal component analysis to extract toxicity information. The biochemical effects of Ce（NO3）3 were characterized by the increase of triglycerides and lactate and the decrease of glycogen in rat liver tissue, together with an elevation of the triglyceride level and a depletion of glycerophosphocholine and betaine in kidney tissues. The target lesions of Ce（NO3）3 on liver and kidney were found by MAS NMR-based metabonomic method. This study demonstrates that the combination of MAS ^1H NMR and pattern recognition analysis can be an effective method for studies of biochemical effects of rare earths.
文摘Mice were watered with cerous nitrate solution (2, 20, 200 mg·kg-1) according to daily drinking water volume for 50 days and the effects of cerous nitrate on nonspecific immunity in mice were investigated. The results showed that the total number of peripheral white blood cell, the clearance rate of charcoal particles, the indices of thymus and spleen were increased on different degrees, and associated with the watering dose, noting that these indices were increased significantly by cerous nitrate at a dose of 20 mg·kg-1 compared with control group. Therefore, it was concluded that the nonspecific immunity could be improved by rare earth Ce in mice.
基金supported by the Guangdong-Hong kong Key Fields and Breakthroughs Project (2008Z012)
文摘In this paper,the sustainable Ce-Mn chemical conversion coating was fabricated on 6063 aluminium alloy by means of Ce(NO3)3 and KMnO4 as the inhibitors and NaF as the accelerator.The morphologies,composition and valence state of the coating were analyzed by scanning electron microscopy(SEM),energy dispersive spectrometry(EDS) and X-ray photoelectron spectroscopy(XPS),respectively.The results indicated that the Ce-Mn conversion coating was formed.The anticorrosion of the coating was evaluated in 3.5 wt.% NaCl aqueous solution at room temperature by using polarization curve and electrochemical impedance spectroscopy(EIS).It indicated that the treated surface presented better anticorrosion behavior in chloride media than on the original material surface.The corrosion resistance of Ce-Mn conversion coating was about equal to the trivalent chromium conversion coating.
