Acta Chimica Sinica ›› 1995, Vol. 53 ›› Issue (4): 328-331. Previous Articles     Next Articles

Original Articles

电化学阻抗谱法研究环氧膜的渗水机理

陈月辉;李善君;浦琮;周传舫   

  1. 复旦大学高分子科学系;复旦大学化学系
  • 出版日期:1995-04-15 发布日期:1995-04-15

Electrochemical impedance studies of the mechanism of the penetration of water in an epoxy resin film

CHEN YUEHUI;LI SHANJUN;PU CONG;ZHOU CHUANFANG   

  • Online:1995-04-15 Published:1995-04-15

Electrochemical impedance spectra were measured for the aluminum electrodes coated and uncoated with an epoxy cresol novolac film in 0.5mol·dm^-^3 NaCl solution (60℃) at open circuit petential, respectively. By fitting the Nyquist curves thus obtained with the equivalent circuit generally used for coated electrode, the values of the film resistance, the film capacitance, the electrochemical reaction resistance and the double layer capacitance at metal/coating interface obtained were used to estimate the mechanism of the penetration of water into the film which is demonstrated to be conducted by chemical channels. After the film has been in the said solution for 8h, its dielectric constant is 5.2 calculated from the film capacitance, which is found to be close to that of the dry film determined using a Q meter.

Key words: EPOXY RESINS, COAT

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