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Citation: Liu Bin, Li Ying, Lin Hai-Chao, Cao Chu-Nan. Effect of PVC on the Diffusing Behavior of Water through Alkyd Coatings[J]. Acta Physico-Chimica Sinica, ;2001, 17(03): 241-244. doi: 10.3866/PKU.WHXB20010311 shu

Effect of PVC on the Diffusing Behavior of Water through Alkyd Coatings

1.
State Key Laboratory for Corrosion and Protection of Metals, Institute of Metal Research, Chinese Academy of Sciences, Shenyang　110015

Received Date: 18 July 2000
Available Online: 15 March 2001

The diffusing behavior of water through alkyd coatings with different pigment volume concentration (PVC) has been studied by EIS and SEM techniques. T he corresponding diffusion coefficients were also calculated. The experimental r esults showed that, in 0.5 mol•L－1 NaCl solution, the diffusion process of wat er through alkyd coatings with different PVC followed the idealFick′s law in the initial period.Within the PVC value concerned, the diffusion coefficients in itially decreased with the increase of PVC parameter, reaching a minimum value a t 60 ％, which is the CPVC of micaceous iron oxide, and then increased with the PVC increase. When the PVC was less than CPVC, the barrier property produced by the pigment was the main factor that affected the water diffusion behavior. Howe ver, the microstructure of the alkyd coatings played an important role when the PVC was greater than CPVC.
- Electrochemical impedance spectroscopy(EIS);SEM;Pigment volume co ncentration (PVC);Alkyd coatings;Diffusion behavior;Diffusion coefficient
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