采用电化学阻抗谱（EIS）方法研究了环氧涂层的厚度与涂装道数对水传输行为的影响。水分子在具有良好阻挡作用的多道环氧涂层的初始阶段的传输符合Fick定律，并求得了水在涂层中的表观扩散系数值，与之相应的干环氧涂层的介电常数ed为4.2。涂层越厚，涂装道数越多，介质在涂层中的传输越困难，涂层的抗渗透性能越好。多道环氧涂层的涂层电容－时间曲线类似于理想情况下单道涂层在水溶液中的涂层电容与浸泡时间的关系曲线。
The diffusion behavior of water through epoxy coatings as a function of the film thickness and the painting number was studied by electrochemical impedance spectroscopy (EIS) techniques. The experimental results showed that, in 3.5 wt.% NaCl solution, the diffusion process of water through multi-layer organic coatings with good barrier performance followed the ideal Fick's law in the initial period. The corresponding diffusion coefficient was also derived and the dielectric constant of the dry coatings (ed) was found to be 4.2. The resistance to medium permeation of the coatings increased with increasing of film thickness and the number of coats.
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