Water uptake in protective organic coatings and its reflection in measured coating impedance
Water uptake in protective organic coatings and its reflection in measured coating impedance
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DOI：
10.1016/j.porgcoat.2018.03.002
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发表时间：
2018-11-01
影响因子：
6.6
通讯作者：
Darowicki, K.
中科院分区：
文献类型：
--
作者：
Miszczyk, A.;Darowicki, K.
采用交流阻抗法和重量法研究了低碳钢表面环氧涂层的吸水性。使用Brasher-Kingsbury方程和文献中使用的各种涂层电容计算方法来确定涂层中的水含量。所得结果与参考重量数据进行了比较。观察到从阻抗数据获得的值相对于重量分析数据的高估。结果发现，有效涂层电容的计算需要使用两个恒相元件（CPE）参数。利用主成分分析（PCA）发现它们与重力数据之间有很强的相关性，在Brasher-Kingsbury方程中使用有效电容公式可以获得与重力数据的显著符合性。
Water uptake in commercially available epoxy coating on mild steel using impedance spectroscopy and gravimeter was studied. The water content in the coating was determined using the Brasher-Kingsbury equation and various methods of coating capacitance calculation used in the literature. The obtained results were compared with reference gravimetric data. An overestimation of values obtained from impedance data in relation to gravimetric data was observed. It was found that the calculation of the effective coating capacitance needs to use both constant phase element (CPE) parameters. Using principal component analysis (PCA) a strong correlation between them and gravimetric data was found. The use of formula of effective capacitance in the Brasher-Kingsbury equation has allowed to obtain significant compliance with gravimetric data.