Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第22卷    第1期    总第154期    2012年1月

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文章编号:1004-0609(2012)01-0324-07
己二酸铵对7075-T6铝合金硫酸阳极氧化的影响
刘建华1,李永星1,于  美1,李松梅1,孙玉静2

(1. 北京航空航天大学 材料科学与工程学院 空天先进材料与服役教育部重点实验室,北京 100191;
2. 国家知识产权局 专利审查协作中心,北京 100088
)

摘 要: 研究硫酸电解液中添加己二酸铵对7075-T6铝合金阳极氧化的影响,采用场发射扫描电子显微镜(FE-SEM)对7075-T6铝合金在不添加和添加己二酸铵的硫酸电解液中制备的阳极氧化膜表面的微观形貌进行分析,采用线性阳极极化研究7075-T6铝合金在两种电解液中的极化行为。利用动电位极化技术和电化学阻抗谱(EIS)研究两种电解液中制备的阳极氧化膜的耐腐蚀性能。结果表明:硫酸电解液中添加己二酸铵可以通过降低电流密度来改善氧化膜的结构,减少氧化膜缺陷,降低微孔孔径,提高阻挡层厚度,从而降低氧化膜的自腐蚀电流密度,提高氧化膜耐腐蚀性能。

 

关键字: 7075-T6铝合金;己二酸铵;阳极氧化;电化学阻抗谱

Effects of ammonium adipate on sulphuric acid anodizing of 7075-T6 aluminum alloy
LIU Jian-hua1, LI Yong-xing1, YU Mei1, LI Song-mei1, SUN Yu-jing2

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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