The corrosion behavior of a titanium-5% tantalum alloy （Ti-STa） in hot nitric acid condensate was investigated to understand aging behavior ofreprocessing equipments. On the basis of long-term immersion tests, it wa...The corrosion behavior of a titanium-5% tantalum alloy （Ti-STa） in hot nitric acid condensate was investigated to understand aging behavior ofreprocessing equipments. On the basis of long-term immersion tests, it was determined that the corrosion of Ti-STa in nitric acid condensate is accelerated with an increase in the concentration. The corrosion rate was nearly constant during the immersion test and the coupons suffered from uniform corrosion. In addition, it is important to note that the nitric acid concentration in the condensate increased on addition of metal salts to the heated nitric acid solution. The larger valence of metal ions was contributed to the increase in the concentration of nitric acid condensate. Consequently, the metal salt in the heated nitric acid solution accelerates the corrosion of Ti-STa in the condensate. Therefore, the nitric acid condensate condition should be carefully considered for the corrosion environment of titanium and its alloys.展开更多
Defects in cerium oxide, especially oxygen va- cancies, play an essential role in its versatile applications and are efficiently preserved at ambient conditions in a non- equilibrium process. Herein, defective CeO2x w...Defects in cerium oxide, especially oxygen va- cancies, play an essential role in its versatile applications and are efficiently preserved at ambient conditions in a non- equilibrium process. Herein, defective CeO2x with hetero- geneous structure was synthesized by high-energy laser melt- ing, where a large amount of oxygen vacancies and Ce3~ could be introduced, leading to improved visible light absorption, narrowed bandgap and room temperature ferromagnetism. Moreover, this laser melted CeO2x exhibits significantly en- hanced low-temperature oxidation behaviors than the coun- terpart prepared by normal hydrogen-reduction. This unique redox performance could be attributed to the intragranular diffusion at the boundaries of assembled nanocrystallites. This method paves a new way for introducing unique multi-func- tions in oxide ceramics.展开更多
文摘The corrosion behavior of a titanium-5% tantalum alloy （Ti-STa） in hot nitric acid condensate was investigated to understand aging behavior ofreprocessing equipments. On the basis of long-term immersion tests, it was determined that the corrosion of Ti-STa in nitric acid condensate is accelerated with an increase in the concentration. The corrosion rate was nearly constant during the immersion test and the coupons suffered from uniform corrosion. In addition, it is important to note that the nitric acid concentration in the condensate increased on addition of metal salts to the heated nitric acid solution. The larger valence of metal ions was contributed to the increase in the concentration of nitric acid condensate. Consequently, the metal salt in the heated nitric acid solution accelerates the corrosion of Ti-STa in the condensate. Therefore, the nitric acid condensate condition should be carefully considered for the corrosion environment of titanium and its alloys.
基金supported by the National Natural Science Foundation of China(51272124 and U1605243)
文摘Defects in cerium oxide, especially oxygen va- cancies, play an essential role in its versatile applications and are efficiently preserved at ambient conditions in a non- equilibrium process. Herein, defective CeO2x with hetero- geneous structure was synthesized by high-energy laser melt- ing, where a large amount of oxygen vacancies and Ce3~ could be introduced, leading to improved visible light absorption, narrowed bandgap and room temperature ferromagnetism. Moreover, this laser melted CeO2x exhibits significantly en- hanced low-temperature oxidation behaviors than the coun- terpart prepared by normal hydrogen-reduction. This unique redox performance could be attributed to the intragranular diffusion at the boundaries of assembled nanocrystallites. This method paves a new way for introducing unique multi-func- tions in oxide ceramics.
