Electrochemical impedance spectroscopy of multi-layer epoxy coatings in NaCl solution

Chin J Mater Res

2004, Vol. 18

Issue (1): 96-96 DOI:

Research Articles

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Electrochemical impedance spectroscopy of multi-layer epoxy coatings in NaCl solution

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浙江大学

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. Electrochemical impedance spectroscopy of multi-layer epoxy coatings in NaCl solution. Chin J Mater Res, 2004, 18(1): 96-96.

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Abstract 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.

Key words: materials failure and protection epoxy coatings electrochemical impedance spectroscopy water uptake

Received: 01 April 2004

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