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首页> 外文期刊>Journal of coatings technology and research >Investigating changes in electrochemical properties when nano-silica is incorporated into an acrylic-based polyurethane clearcoat
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Investigating changes in electrochemical properties when nano-silica is incorporated into an acrylic-based polyurethane clearcoat

机译：当将纳米二氧化硅掺入丙烯酸基聚氨酯透明涂料中时，研究电化学性能的变化

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摘要

Two different types of nano-silica (i.e., hydrophilic Aerosil 200 and hydrophobic Aerosil R805) were employed in the preparation of 2-pack acrylic polyol polyurethane nano-coatings so that the electrochemical properties of the resultant coatings could be investigated. Electrochemical impedance spectroscopy was used to evaluate the corrosion performances of such nano-coatings applied onto mild steel substrates that were immersed in 3.5% (w/w) NaCl solutions. It was observed coatings that contained nano-silica increased the barrier properties of the binder, as well as the coatings' electrochemical resistance compared with pure polyurethane coatings. The surface tension of pure polyurethane was measured by a tensiometer. Rheological properties were also determined at various shear rates by a rotaviscometer. Results showed that the surface tension of hydrophobic nano-silica is very close to the pure polyurethane matrix, giving the better compatibility of the two. This was further confirmed by transmission electron microscopy and by the fact that the hydrophobically filled nano-silica coatings showed shear thinning behavior in the fluid state. Also observed was better corrosion performance of the resultant hydrophobic nano-coatings compared to coatings embedded with hydrophilic nano-silica.
机译：两种不同类型的纳米二氧化硅（即亲水性Aerosil 200和疏水性Aerosil R805）用于制备2组分丙烯酸多元醇聚氨酯纳米涂料，从而可以研究所得涂料的电化学性能。电化学阻抗谱用于评估这种纳米涂层在浸入3.5％（w / w）NaCl溶液的低碳钢基材上的腐蚀性能。观察到，与纯聚氨酯涂料相比，含有纳米二氧化硅的涂料提高了粘合剂的阻隔性能，以及涂料的耐电化学性。通过张力计测量纯聚氨酯的表面张力。还通过旋转粘度计在各种剪切速率下测定流变性质。结果表明，疏水性纳米二氧化硅的表面张力非常接近纯聚氨酯基质，从而使两者具有更好的相容性。通过透射电子显微镜和疏水填充的纳米二氧化硅涂层在流体状态下显示出剪切稀化行为这一事实进一步证实了这一点。还观察到与嵌入亲水性纳米二氧化硅的涂层相比，所得疏水性纳米涂层的腐蚀性能更好。

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