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首页> 外文期刊>Journal of Coating Technology >Electrochemical Impedance Spectroscopy Evaluation of Various Aluminum Pretreatments Painted with Epoxy Primer
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Electrochemical Impedance Spectroscopy Evaluation of Various Aluminum Pretreatments Painted with Epoxy Primer

机译：环氧底漆上各种铝预处理的电化学阻抗谱评估

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摘要

Panels of aerospace aluminum (Al) alloys 2024 (UNS A92024) and 7075 (UNS A97075) were coated with four pretreatments (thin-film sulfu-ric-acid [H_2SO_4] anodization, chromic-acid an-odization, and two commercial silica-based gels). Some of these panels were painted with chromated epoxy primer (MIL-P-23377D). AH panels were subjected to several months of monitoring by electrochemical impedance spectros-copy (EIS) at open-circuit potential. Several panels were also subjected to EIS measurements made at various applied potentials. Equivalent circuit simulations indicate that a model like that proposed by van Westing, et al, which includes four time-constants (coating, pore, double-layer, and pretreatments) fits the data well. The epoxy primer is shown to be a highly porous, non-barrier coating.
机译：航空航天铝（Al）合金2024（UNS A92024）和7075（UNS A97075）的面板涂有四种预处理方法（薄膜硫酸[H_2SO_4]阳极氧化，铬酸阳极氧化和两种商用二氧化硅-基础凝胶）。这些面板中的某些面板涂有铬酸盐底漆（MIL-P-23377D）。通过电化学阻抗谱（EIS）在开路电势下对AH面板进行了几个月的监控。还对数个面板进行了各种施加电势下的EIS测量。等效电路仿真表明，类似于van Westing等人提出的模型，该模型包含四个时间常数（涂层，孔，双层和预处理），非常适合数据。环氧底漆显示为高度多孔的无阻涂层。

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