选用熔融结合环氧粉末（FBE）涂层作为研究对象,用电化学阻抗谱法（EIS）考察流动的和静止的涂层在3％ NaCl溶液介质中的失效行为,以此探讨流动条件对涂层的失效行为的影响.结果表明，涂层在流动的条件下加速失效,失效的原因是液体的流动加速了溶液中离子,而不是水分子向涂层中的渗透.这为考核涂层提供了一种新的加速实验方法.
Fusion-bonded epoxy (FBE) powder coating on steel was selected to investigate the effect of flowing condition on coating degradation in 3% NaCl aqueous solution at 60℃ by EIS.The immersion tests in flowing condition were conduct ed by using a rotating cylinder apparatus.The relative permittivity calculated from the high frequency value of impedance spectra,was used as the index to monitor properties variation with immersion time.The results obtained from EIS measurements and visual examination showed that the flowing immersion condition brought much greater destruction to the coatings than the corresponding static condition.This results can be explained that the introduction of flowing condition accelerated the ions,not water molecules,into the coatings.The present investi gation provides an accelerating test way to evaluate degradation of excellent coating.
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