(1. 北京化工大學(xué) 材料科學(xué)與工程學(xué)院， 北京 100029;
2. 中國(guó)科學(xué)院 金屬研究所金屬腐蝕與防護(hù)國(guó)家重點(diǎn)實(shí)驗(yàn)室，
沈陽(yáng) 110015)
摘 要: 采用交流阻抗法研究了工業(yè)純鋁L3陽(yáng)極氧化膜在中性NaCl溶液中交流阻抗譜的變化規(guī)律， 比較了未封閉處理與沸水封閉處理后氧化膜的交流阻抗譜的差異，并結(jié)合等效電路分析了氧化膜多孔層與阻擋層電化學(xué)參數(shù)的變化。 結(jié)果表明， 未封閉的陽(yáng)極氧化膜在NaCl溶液中浸泡初期存在一個(gè)自封閉過程， 封閉處理明顯提高氧化膜多孔層的初始Rp值并降低初始CPEp值； 溶液中侵蝕性離子濃度越高，封閉處理提高鋁陽(yáng)極氧化膜的耐蝕性能作用越明顯。
關(guān)鍵字: 交流阻抗； 陽(yáng)極氧化膜； 封閉
（ 1. School of Materials Science and Engineering,
Beijing University of Chemical Technology,
Beijing 100029, China;
2. State Key Laboratory for Metals Corrosion and Protection,
Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110015, China）
Abstract: The electrochemical impedance behaviors of unsealed and sealed anodized aluminum films in sodium chloride solutions were studied by means of electrochemical impedance spectroscopy. The electrochemical parameters for the anodic film were analyzed by an equivalent circuit method. The results reveal that there is an auto-sealing process in sodium chloride solutions for the unsealed anodized aluminum. Boiling water-sealing process obviously increases the initial Rp value of the porous layer and decreases the initial CPEp value. The higher the aggressive ion concentration in the solution, the more effectively the sealing process improves corrosion resistance of the anodized films.
Key words: electrochemical impedance behaviors； anodized film； sealed
