STUDY ON THE DIFFUSING BEHAVIOROF WATER THROUGH EPOXY COATINGS BY EIS

J Chin Soc Corr Pro

2002, Vol. 22

Issue (3): 172-175 DOI:

Research Report

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STUDY ON THE DIFFUSING BEHAVIOROF WATER THROUGH EPOXY COATINGS BY EIS

Bin Liu;Ying Li;Haichao Lin

中科院沈阳金属研究所;金属腐蚀与防护国家重点实验室

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Abstract 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.

Key words: EIS epoxy coatings diffusion PVC

Received: 15 March 2001

ZTFLH:

TG174.41

Corresponding Authors: Bin Liu

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Bin Liu; Ying Li; Haichao Lin. STUDY ON THE DIFFUSING BEHAVIOROF WATER THROUGH EPOXY COATINGS BY EIS. J Chin Soc Corr Pro, 2002, 22(3): 172-175 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2002/V22/I3/172

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