固化温度对Al2O3–SiO2–MTMS复合涂层结构和性能的影响
以硅溶胶和铝溶胶作为纳米相,甲基三甲氧基硅烷（MTMS）为前驱体,制备了改性纳米复合溶胶,并以旋涂法在铝板表面制备了防腐保护涂层。通过热重–差热分析、Fourier变换红外光谱、扫描电子显微镜、电化学阻抗谱、接触角测试等方法考察了固化温度对涂层结构和性能的影响。结果表明：固化温度在400℃以下时,复合涂层能稳定存在;在400℃以上时,涂层中的—CH3逐渐分解。涂层的厚度约为10μm,固化温度为120～240℃时所得涂层结构致密,在640℃时涂层出现裂纹。随固化温度升高,涂层接触角由106°降至20°,涂层铅笔硬度由3H增大至6H;涂层附着力、抗冲击强度和涂层阻抗先增大后减小,在180℃达到最佳...
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| Published in | 硅酸盐学报 Vol. 41; no. 9; pp. 1258 - 1264 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
2013
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| Subjects | |
| Online Access | Get full text |
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| Summary: | 以硅溶胶和铝溶胶作为纳米相,甲基三甲氧基硅烷（MTMS）为前驱体,制备了改性纳米复合溶胶,并以旋涂法在铝板表面制备了防腐保护涂层。通过热重–差热分析、Fourier变换红外光谱、扫描电子显微镜、电化学阻抗谱、接触角测试等方法考察了固化温度对涂层结构和性能的影响。结果表明：固化温度在400℃以下时,复合涂层能稳定存在;在400℃以上时,涂层中的—CH3逐渐分解。涂层的厚度约为10μm,固化温度为120～240℃时所得涂层结构致密,在640℃时涂层出现裂纹。随固化温度升高,涂层接触角由106°降至20°,涂层铅笔硬度由3H增大至6H;涂层附着力、抗冲击强度和涂层阻抗先增大后减小,在180℃达到最佳值;此时涂层抗冲击强度和阻抗分别为45cm/kg和2.95×103Ω·cm2。 |
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| Bibliography: | colloidal silica; boehmite sol; polysiloxane coating; anti-corrosion; curing temperature Nano-composite sols were prepared using methyltrimethoxysilane as a precursor and commercial silica sols and boehmite sols as nano-phase materials, and the anti-corrosion coatings were deposited on the surface of aluminium plates via a spin method. The effect of curing temperature on the structure and performance of the composite coatings was investigated by thermogravim-etry-differential thermal analysis, Fourier transform infrared spectroscopy, scanning electron microscopy, electrochemical impedance spectroscopy and contact angle measurement, respectively. The results show that the composite coatings are stable at〈400℃, and the methyl group （-CH3） in the coatings decomposes gradually at〉400℃. The coating thickness is 10μm. The coating prepared in the curing temperature range of 120-240℃is dense. The coating can crack at 640℃. The contact angle of the coating decreases from 106°to 20°, the pencil hardness of the coating i |
| ISSN: | 0454-5648 |