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| Diffusing Behavior of Water and Chloride Ion Through Acrylic Polyurethane Coating |
| Lixia Yang;Xiaogang Li;;Hongda Deng;Sanping Zhang;An Lin |
| 武汉材料保护研究所 |
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Abstract Diffusing behavior of water and chloride ion through acrylic polyurethane coating was studied using water vapor, chloride ion transmission rate technique of organic coatings and electrochemical impedance spectroscopy (EIS) technique in this paper. The results obtained indicate that diffusing behavior of water was suited for Fick diffusion law in early stage, later water percolating capacity was constant, constant water percolating capacity was reduced with the increasing of film thickness .Chloride ion percolating capacity was constant in early stage, later increased linearly，diffusion coefficient of chloride ion through coatings can be obtained by slope coefficient ;with the ihncreasing of film thickness, time of chloride ion concentration keeping balance was prolonged and equilibrium concentration of chloride ion was reduced, diffusing coefficient of chloride ion through coating was also reduced. According to the change of resistance and capacity of coatings and metal, and time of the second time constant appeared, diffusing behavior of electrolyte through coatings and corrosion of metals under the coating could be evaluated by EIS.
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Received: 25 August 2004
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Corresponding Authors:
Lixia Yang
E-mail: yanglx2000@tom.com
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