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应用EIS研究改性无溶剂环氧防腐涂层的防护性能和腐蚀特征
Authors
丁锐
余海斌
桂泰江
蒋建明
Publication date
1 January 2017
Publisher
Abstract
本实验使用电化学阻抗谱技术发现钢材表面不同厚度的改性无溶剂环氧防腐涂层的服役后期状态变化有所区别,主要体现在阻抗谱等效电路的不同。根据阻抗谱的变化特征,将厚度30μm涂层的服役过程划分成5个区间:初期渗水、腐蚀发生、Warburg扩散控制、腐蚀扩展、涂层失效;将厚度60μm涂层的服役过程划也分成5个区间:初期渗水、腐蚀发生和渗水受阻、Warburg扩散控制、有限层扩散控制、阻挡层扩散控制。因30μm的厚度太小,侵蚀性粒子对涂层的渗透比较容易,在涂层服役中后阶段,有向局部腐蚀和鼓泡剥离发展的倾向,防护性能持续下降,腐蚀指标持续上升。厚度60μm的涂层表现出良好的防护性能,中后期涂层的保护作用和腐蚀指标能够维持稳定。厚度60μm涂层浸泡1年后最大电化学腐蚀活性区面积不到0.12%,涂层孔隙率能够保持在10~(-8)左右。以菲克第二定律为基础推导出了涂层中水扩散动力学模型,根据该模型生成的图像可以形象地体现水在涂层的三维分布和动态变化,模型理论结果与实验数据吻合
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Last time updated on 22/01/2018