基于弛豫时间分布和有限元模拟的环氧涂层渗水行为研究

Water Penetration Behavior of Epoxy Coating Based on Distribution of Relaxation Time and Finite Element Simulation

采用弛豫时间分布(DRT)技术和有限元模拟方法,从微观电化学角度分析研究了环氧涂层的渗水行为过程。结果表明:环氧涂层的渗水过程分为3个阶段:初始阶段、饱和阶段和失效阶段。3个阶段中,涂层内部水和腐蚀性介质的含量不同,会严重影响涂层的电容变化。本文为有机防护涂层的机理研究提供了一种新的综合分析方法。

In fact,the variation of water content within an organic coating will affect its corrosion protection performance.Thus,the penetration of water in an epoxy coating would be studied via distribution of relaxation time(DRT)technique and finite element simulation method in terms of the perspective of micro electrochemistry in this article.Results show that the water penetration process of the epoxy coating may be differentiated into three stages:initial stage,saturation stage and failure stage.In the three stages,the different content of water and corrosive medium inside the coating can seriously affect the variation of capacitance of the coating.This paper provides a new comprehensive analysis method for the mechanism study of organic protective coatings.