The ion diffusion has been studied by cathodic delamination methods. A double electrochemical cell has been used to separate the solution in contact with an artificial defect and the solution in contact with the rest of the intact organic coating (epoxy polyamide coated phosphatised steel). In this way , it is possible to control the environment (ions and concentration) in the defect and around the defect. Electrochemical impedance spectra(EIS) was used to investigate delamination phenomena at the epoxy/steel interface in the two parts of the cell. The result shows that the K+ can diffuse through the epoxy coating , while Na+ can hardly diffuse through the epoxy coating. The larger the size of the hydrated cation is, the slower the diffusion rate of cations is . The water activity is one of the important influencing factor for the induction time of delamination.
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王勇 许立宁 路民旭. 有机涂层中离子传输行为研究[J]. 科学技术与工程, 2007, (19): 4865-48704893. WANG Yong, XU Li-ning, LU Min-xu. Study of Ion Diffusion through Organic Coatings[J]. Science Technology and Engineering,2007,(19):4865-48704893.