TiO_2/聚二甲基硅氧烷超疏水涂层制备及其金属防腐性能研究  

Preparation and TiO_2/ Polydimethylsiloxane Superhydrophobic Coating and Its Anticorrosive Property

作　　者：莫春燕[1] 郑燕升[1,2] 王发龙[1] 胡传波[1] 莫倩[1] 

机构地区：[1]广西科技大学生物与化学工程学院,广西柳州545006 [2]广西科技大学鹿山学院,广西柳州545616

出　　处：《塑料工业》2015年第2期125-129,135,共6页China Plastics Industry

基　　金：广西教育厅科研项目(N0.201012MS123)

摘　　要：以铝片为基底,采用溶胶凝胶法,制备疏水防腐涂层。以纳米Ti O2和聚二甲基硅氧烷为原料,通过硬脂酸使纳米Ti O2表面由亲水性变成疏水性,然后将改性后的Ti O2与聚二甲基硅氧烷复合,经机械共混、热处理、浸渍提拉等过程,形成超疏水防腐涂层。涂层表面形貌和疏水性采用X射线衍射仪、傅里叶红外光谱仪、扫描电镜、接触角分析仪等进行表征。结果表明,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°;采用极化曲线和交流阻抗等电化学法对涂层防腐性能进行表征,结果表明,其腐蚀电位较纯聚二甲基硅氧烷涂层正移0.2 V,而相比裸铝片,腐蚀电位从-926 m V正移至-525 m V,腐蚀电流密度从4.68×10-5A/cm2下降至5.69×10-6A/cm2。Hydrophobic coatings were prepared on aluminum substrates by sol-gel method. The TiO2 particles and polydimethylsiloxane were used as raw materials. First, the TiO2 particles were modified by stearic acid for making their surfaces from hydrophilic to hydrophobic, then the hydrophobic and anti-corrosive coating were formed with nano-modified-TiO2 and polydimethylsiloxane after mechanical mixing, thermal treatment and aging curing method. The surface structure and hydrophobicity of composite coating were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and contact angle analyzer, The results showed the TiO2/polydimethylsiloxane composite coating with micro/nano double rough structure had a static contact angle of 155 ° and a rolling angle of 8 ° against water. The corrosion of the composite was represented by electrochemical methods including polarization curve measurement and alternating current impedance spectroscopy. The results indicated that the TiO2/ polydimethylsiloxane composite coating had a good anti-corrosion performance, compared with the pure polydimethylsiloxane, its corrosion potential had a positive shift for about 0.2 V, what＇s more, to be compared with the bare aluminum, the corrosion potential of the composite had a positive shift from -926 mV to -525 mV and its corrosion electric current was decreased from 4. 68×10^-5 A/cm^2 to 5. 69×10^-6 A/cm^2

关 键 词：含氢硅油 微/纳米粗糙结构 超疏水 防腐 

分 类 号：O647[理学—物理化学] TG174.4[理学—化学]