利用电化学阻抗谱技术，研究了H2O在不同颜料体积浓度( PVC)环氧涂层中的传输行为，计算出H2O在不同PVC环氧涂层中的扩散系数,并分析了PVC对 H2O在环氧涂层中传输行为的影响.结果表明，在05 mol/L NaCl水溶液中，H2O在不 同PVC环氧涂层中传输的起始阶段满足菲克第二扩散定律；在所研究的PVC数值范围内，扩散 系数随PVC的增大而减小.
The diffusing behavior of water through epoxy coati ngs with different pigment volume concentration(PVC) has been studied by electro chemical impedance spectroscopy(EIS).The corresponding diffusion coefficients we re calculated and the effect of PVC on the diffusing behavior were studied.The e xperiment results showed that,in 0.5 mol/L NaCl solution,the diffusion process o f water through epoxy coatings with different PVC followed the second Fick di ffusion law in the initial period.Within the PVC value concerned(35%～50%),the d iffusion coefficients decreased with increasing PVC.When PVC was less than critical pigment volume concentration(CPVC),the obstruction effect by the pigme nt plates was the main factor influencing the diffusing process of water through epoxy coatings.
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