(1. 北京航空航天大學 材料科學與工程學院 空天先進材料與服役教育部重點實驗室，北京 100191；
2. 國家知識產(chǎn)權(quán)局 專利審查協(xié)作中心，北京 100088)
摘 要: 研究硫酸電解液中添加己二酸銨對7075-T6鋁合金陽極氧化的影響，采用場發(fā)射掃描電子顯微鏡(FE-SEM)對7075-T6鋁合金在不添加和添加己二酸銨的硫酸電解液中制備的陽極氧化膜表面的微觀形貌進行分析，采用線性陽極極化研究7075-T6鋁合金在兩種電解液中的極化行為。利用動電位極化技術(shù)和電化學阻抗譜(EIS)研究兩種電解液中制備的陽極氧化膜的耐腐蝕性能。結(jié)果表明：硫酸電解液中添加己二酸銨可以通過降低電流密度來改善氧化膜的結(jié)構(gòu)，減少氧化膜缺陷，降低微孔孔徑，提高阻擋層厚度，從而降低氧化膜的自腐蝕電流密度，提高氧化膜耐腐蝕性能。
關(guān)鍵字: 7075-T6鋁合金；己二酸銨；陽極氧化；電化學阻抗譜
（1. Key Laboratory of Aerospace Materials and Performance, Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, China;
2. State Intellectual Property Office of Patent Examination Collaborating Centre, Beijing 100088, China）
Abstract:The effect of ammonium adipate on the sulphuric acid anodizing of 7075-T6 aluminum alloy was studied. The surface morphologies of anodic oxide films formed in the sulphuric acid solutions with and without ammonium adipate were studied by using field emission scanning electron microscopy (FE-SEM). The anodizing behavior of 7075-T6 aluminum alloy was investigated under linear polarization conditions in sulphuric acid anodizing solutions with and without of ammonium adipate. The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were used to study the corrosion resistance of the anodic oxide films formed in the presence and absence of ammonium adipate. The results show that the ammonium adipate in sulfuric acid solution can reduce the cavity defects of the films, decrease the pores diameter, reduce the corrosion current density, enhance the thickness of the barrier layer and improve the corrosion resistance of anodic oxide films by decreasing the current density.
Key words: 7075-T6 aluminum alloy; ammonium adipate; anodizing; electrochemical impedance spectrascopy
