Wet- and Corrosive De-Adhesion Processes of Water-Borne Epoxy Film Coated Steel II. The Influence of -Glycidoxypropyltrimethoxysilane as an Adhesion Promoting Additive
Wet- and Corrosive De-Adhesion Processes of Water-Borne Epoxy Film Coated Steel II. The Influence of -Glycidoxypropyltrimethoxysilane as an Adhesion Promoting Additive
复制标题
水性环氧薄膜涂层钢的湿法和腐蚀脱粘工艺 II。
DOI：
10.1149/1.3525240
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发表时间：
2011
影响因子：
3.9
通讯作者：
G. Grundmeier
中科院分区：
文献类型：
--
作者：
M. Santa;R. Posner;G. Grundmeier
采用γ-缩水甘油氧丙基三甲氧基硅烷（γ-GPS）改性环氧树脂涂层覆盖低碳钢基体。采用电化学阻抗谱和衰减全反射红外光谱研究了涂层的阻隔性能。通过原位扫描开尔文探针（SKP）测量界面电位，确定了样品对环氧树脂/钢界面沿着离子传输过程的电阻。X射线光电子能谱的研究有助于分析所产生的离子在基板表面上的分布。γ-GPS的应用导致界面水活性的降低，并暂时稳定聚合物/钢界面。与未改性的环氧树脂涂层的实验相比，界面离子传输过程是可验证的SKP。在样品暴露于潮湿空气几天后，γ-GPS的稳定作用减弱，必须在干燥的大气中记录SKP电位曲线，以确定电解质前沿位置、阳离子和阴离子分离区以及界面处的局部腐蚀损伤区域。这种方法似乎是一般有前途的分析后，在潮湿的空气中长期暴露的聚合物/氧化物/金属界面的降解状态。
Low carbon steel substrates were covered with a γ-glycidoxypropyltrimethoxysilane (γ-GPS) modified epoxy layer. Electrochemical impedance spectroscopy and attenuated total reflection infrared spectroscopy were used to investigate the barrier properties of the coating. The resistance of the samples to ion transport processes along the epoxy/steel interface was determined by in situ scanning Kelvin probe (SKP) measurements of the interface potential. X-ray photoelectron spectroscopy studies helped to analyze the resulting ion distribution on the substrate surface. The application of γ-GPS resulted in a reduction of the interfacial water activity and temporarily stabilized the polymer/steel interface. In contrast to the experiments with the unmodified epoxy coating, interfacial ion transport processes were verifiable with the SKP. After some days of sample exposure to humid air, the stabilizing effect of γ-GPS diminished and SKP potential profiles had to be recorded in dry atmosphere to identify the electrolyte front position, zones of cation and anion separation, and areas of local corrosion damage at the interface. This approach seems to be generally promising to analyze the degradation state of polymer/oxide/metal interfaces after long-term exposures in humid air.