航空学报 > 2007, Vol. 28 Issue (3): 714-718

用EIS法研究丙烯酸聚氨酯涂层的光老化性能

郑天亮,张华,王轩,王月红,张璋   

  1. 北京航空航天大学 材料科学与工程学院
  • 收稿日期:2006-01-20 修回日期:2006-07-13 出版日期:2007-05-10 发布日期:2007-05-10
  • 通讯作者: 郑天亮

 Research on the Photoaging of Acrylic Polyurethane Coatings Using Electrochemical Impedance Spectroscopy

ZHENG Tian-liang,ZHANG hua,WANG Xuan,WANG Yue-hong,ZHANG Zhang   

  1. School of Material Science and Engineering, Beijing University of Aeronautics and Astronautics
  • Received:2006-01-20 Revised:2006-07-13 Online:2007-05-10 Published:2007-05-10
  • Contact: ZHENG Tianliang

摘要:

用交流阻抗图谱法(EIS)研究了丙烯酸聚氨酯涂层的紫外光老化过程。老化前后涂层的孔隙率电阻、涂层电容、极化电阻以及双电子层电容均发生了明显变化。涂层孔隙率从1.986×10-5上升到2.174×10-4,半定量化地表征了涂层的老化规律。SEM分析验证了涂层孔隙率的变化,涂层失光率、色差变化规律跟孔隙率的变化规律有很好的相关性。研究结果证明,涂层的孔隙率可以作为一个重要参数用来检测及预测涂层的老化规律。最后,根据EDS的检测结果对丙烯酸聚氨酯涂层的老化机理进行了探讨。

关键词: 涂层, 光老化, EIS, 孔隙率

Abstract:

The degradation of acrylic polyurethane coating when exposed to UV radiation is studied by monitoring its properties variation using electrochemical impedance spectroscopy(EIS).The properties of the coating such as porosity resistance,coating capacitance,polarize resistance and double electrolayer capacitance are changed obviously before and after being exposed to UV light.Electrochemical impedance spectroscopy demonstrates that the porosity of the film increases with the exposure time and it can be measured quantitatively.

Key words: coating,  , photoaging,  , EIS,  , porosity

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