中南大学学报（自然科学版）2017，Vol.48Issue(9)：2257-2263,7.DOI:10.11817/j.issn.1672-7207.2017.09.001
阳极电位对锆在异丙醇中溶解行为的影响
Effect of anodic potential on dissolution of zirconium in isopropyl alcohol solution
摘要
Abstract
Anodic dissolution of zirconium in isopropyl alcohol solution containing Bun 4NBr at different potentials was investigated using cyclic voltammetry, potentiostatic current-time transient, A.C. impedance techniques, SEM and X-ray photoelectron spectroscopy (XPS). The results show that zirconium does not exhibit active dissolution due to the presence of passive film on surface, and the large capacitance loop appears in the anodic potential range of 0 to 1.10 V and open circuit potential increases with time. When the anodic potential is greater than 1.10 V, zirconium suffers from pitting corrosion due to the aggressive attack of passive film by bromide anions. Correspondingly, the Nyquist plot shows a large capacitance loop at high frequencies, an inductive loop at the middle frequencies and a warburg impedance at the low frequencies. The stable pitting potential is between 1.10 V and 1.20 V. The pit growth is an instantaneous threedimensional nucleation followed by growth controlled by diffusion. With the increase of anodic potential, the pitting corrosion accelerates, which is indicated by deeper pits, larger corrosion area and a smaller capacitance loop at the high frequencies. Zirconium surface has a layer of passive film mainly composed of ZrO2 and dissolves to produce Zr(OC3H7)4 .关键词
锆/点蚀/异丙醇/阳极电位Key words
zirconium/ pitting corrosion/ isopropyl alcohol/ anodic potential分类
化学化工引用本文复制引用
杨喜云,黄海强,杨声海..阳极电位对锆在异丙醇中溶解行为的影响[J].中南大学学报（自然科学版）,2017,48(9):2257-2263,7.基金项目
国家自然科学基金资助项目(51374254) (Project(51374254) supported by the National Natural Science Foundation of China) （51374254）
