陽極電位對鋯在異丙醇中溶解行為的影響
發(fā)布時間：2018-11-25 10:44
【摘要】：采用循環(huán)伏安法(CV)、計時電流法、交流阻抗法(EIS)、掃描電鏡(SEM)和X線光電子能譜(XPS)研究不同電位下鋯在異丙醇溶液中陽極溶解行為。研究結(jié)果表明:當(dāng)陽極電位為0~1.10 V時,鋯表面存在氧化膜導(dǎo)致鈍化,不發(fā)生活性溶解;交流阻抗復(fù)數(shù)平面圖出現(xiàn)大的容抗弧;自腐蝕電位隨時間延長而增大;當(dāng)陽極電位大于1.10 V,Br~-擊穿鈍化膜使鋯發(fā)生活性溶解,鋯溶解屬于點蝕,交流阻抗復(fù)數(shù)平面圖在高頻區(qū)出現(xiàn)容抗弧,在中頻區(qū)出現(xiàn)感抗弧,在低頻區(qū)出現(xiàn)Warburg阻抗;穩(wěn)態(tài)點蝕電位處于1.10~1.20 V之間,點蝕的成核方式為瞬間三維成核,生長過程為擴散控制;提高陽極電位,點蝕加劇,腐蝕面積加大,腐蝕孔加深,容抗弧直徑減小;鋯表面鈍化膜的主要成分為ZrO_2,在異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.
【作者單位】： 中南大學(xué)冶金與環(huán)境學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(51374254)~~
【分類號】：O614.412
本文編號：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.
【作者單位】： 中南大學(xué)冶金與環(huán)境學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(51374254)~~
【分類號】：O614.412
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