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- W2004121344 abstract "Abstract The electrochemical impedance spectroscopy (EIS) of epoxy-coated aluminum alloy LY12 has been investigated during exposure to 3.5% NaCl solution. Using the continuous simulation of EIS by expanded general electrical model, the time-dependent impedance model of the alloy/coating/solution system was deduced. The results shown that the composite electrode displayed a barrier behavior before water and oxygen penetrated to alloy base. After water and oxygen reached the base, the impedance associated with corrosion of alloy base changed with the immersion time as following: (i) active corrosion period at the beginning (double-layer capacitance, Cdl, in parallel to the charge transfer resistance of electrochemical corrosion Rct), (ii) impeding of the diffusion of corrosion production at the intermediate period as a result of the presence of coated film (a constant phase element Zdiff was additionally in series with Rct), and (iii) appearance of the characteristic impedance related to Cl− ion-participating reaction with alloy base at the later stage. From the linear part of ln Cc–t0.5 curve in the early immersion stage, the apparent diffusion coefficient of water was obtained. The diffusion coefficient of water and Cl− ion through the coating was also calculated by the required time for diffusion of permeation species through the coating to the metal interface obtained from the simulation of EIS data by which the occurrence of characteristic impedance element(s) corresponding to special species arrival can be determined." @default.
- W2004121344 created "2016-06-24" @default.
- W2004121344 creator A5063241973 @default.
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- W2004121344 date "2003-06-01" @default.
- W2004121344 modified "2023-10-16" @default.
- W2004121344 title "Determination of water uptake and diffusion of Cl− ion in epoxy primer on aluminum alloys in NaCl solution by electrochemical impedance spectroscopy" @default.
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- W2004121344 doi "https://doi.org/10.1016/s0300-9440(03)00010-9" @default.
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