阳极电位对锆在异丙醇中溶解行为的影响
发布时间：2018-11-25 10:44
【摘要】：采用循环伏安法(CV)、计时电流法、交流阻抗法(EIS)、扫描电镜(SEM)和X线光电子能谱(XPS)研究不同电位下锆在异丙醇溶液中阳极溶解行为。研究结果表明:当阳极电位为0~1.10 V时,锆表面存在氧化膜导致钝化,不发生活性溶解;交流阻抗复数平面图出现大的容抗弧;自腐蚀电位随时间延长而增大;当阳极电位大于1.10 V,Br~-击穿钝化膜使锆发生活性溶解,锆溶解属于点蚀,交流阻抗复数平面图在高频区出现容抗弧,在中频区出现感抗弧,在低频区出现Warburg阻抗;稳态点蚀电位处于1.10~1.20 V之间,点蚀的成核方式为瞬间三维成核,生长过程为扩散控制;提高阳极电位,点蚀加剧,腐蚀面积加大,腐蚀孔加深,容抗弧直径减小;锆表面钝化膜的主要成分为ZrO_2,在异丙醇溶液中溶解生成Zr(OC_3H_7)_4。
[Abstract]:The anodic dissolution behavior of zirconium in isopropanol solution was studied by cyclic voltammetry (CV),) chronoamperometry, AC impedance (EIS), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results show that when the anodic potential is 0 ~ 1.10 V, there is an oxide film on the zirconium surface, which leads to passivation and no active dissolution; the complex plane diagram of AC impedance has a large capacitive reactance, and the self-corrosion potential increases with time. When the anodic potential is greater than 1.10 V ~ (-1) V Br-breakdown passivating film, zirconium dissolution is a kind of pitting corrosion. The complex plane diagram of AC impedance appears capacitive reactance arc in the high frequency region, inductive reactance arc in the middle frequency region, and Warburg impedance in the low frequency region. The steady-state pitting potential is between 1.10V and 1.20V, the nucleation mode of pitting is instantaneous three-dimensional nucleation, the growth process is controlled by diffusion, the anode potential is increased, the corrosion area increases, the corrosion hole deepens, and the diameter of capacitive arc decreases. The main composition of zirconium surface passivation film is that ZrO_2, dissolves in isopropanol solution to form Zr (OC_3H_7) _ 4.
【作者单位】： 中南大学冶金与环境学院;
【基金】：国家自然科学基金资助项目(51374254)~~
【分类号】：O614.412
本文编号：2355816
[Abstract]:The anodic dissolution behavior of zirconium in isopropanol solution was studied by cyclic voltammetry (CV),) chronoamperometry, AC impedance (EIS), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results show that when the anodic potential is 0 ~ 1.10 V, there is an oxide film on the zirconium surface, which leads to passivation and no active dissolution; the complex plane diagram of AC impedance has a large capacitive reactance, and the self-corrosion potential increases with time. When the anodic potential is greater than 1.10 V ~ (-1) V Br-breakdown passivating film, zirconium dissolution is a kind of pitting corrosion. The complex plane diagram of AC impedance appears capacitive reactance arc in the high frequency region, inductive reactance arc in the middle frequency region, and Warburg impedance in the low frequency region. The steady-state pitting potential is between 1.10V and 1.20V, the nucleation mode of pitting is instantaneous three-dimensional nucleation, the growth process is controlled by diffusion, the anode potential is increased, the corrosion area increases, the corrosion hole deepens, and the diameter of capacitive arc decreases. The main composition of zirconium surface passivation film is that ZrO_2, dissolves in isopropanol solution to form Zr (OC_3H_7) _ 4.
【作者单位】： 中南大学冶金与环境学院;
【基金】：国家自然科学基金资助项目(51374254)~~
【分类号】：O614.412
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