TiO_2/含氢硅油超疏水防腐涂层的制备及其性能研究

Preparation and property of TiO_2/PMHS superhydrophobic and anticorrosive coating

用硬脂酸在TiO_2表面引入疏水性甲基,将改性后TiO_2与含氢硅油(PMHS)杂合,在铝基底上形成超疏水涂层。采用X射线衍射仪、红外光谱、扫描电镜和接触角分析仪,表征涂层的表面形貌和疏水性。结果表明:TiO_2/PMHS复合涂层表面具有微/纳米双重粗糙结构,与水的静态接触角为155°,滚动角8°;采用极化曲线等电化学法对涂层防腐性能进行表征,结果表明其腐蚀电位从裸铝片的-926mV正移至-603mV,腐蚀电流密度从裸铝片的4.68×10-5 A/cm^2下降至6.60×10^(-6)A/cm^2,显示出良好的防腐性能。

TiO2 particles were modified by stearic acid in order to be introduced to hydrophobic methyl.Then the modified-TiO2 was blended with polymethylhydrosiloxane,the superhydrophobic composite coating was formed on the alumium substrate.The surface structure and hydrophobicity of coating were studied by X-ray diffractometer,infrared spectroscopy,scanning electron microscopy and contact angle analyzer.The results showed that TiO2/PMHS composite coating with micro/nano double rough structure had a static contact angle of 155°and a rolling angle of 8°against water.The anticorrosion of coating was characterized by electrochemical methods including polarization curve measurement.The results indicated that the coating had a good anticorrosion performance.Compared with the bare alumium sheet,its corrosion potential had a positive shift from-926 mV to-603 mV and its corrosion electric current was decreased from 4.68×10^（-5）A/cm^2 to 6.60×10^（-6）A/cm^2.