引用本文:薛鑫宇,尹正生,蒋永锋,包晔峰,杨可.碳钢表面防腐超疏水TiO2/PDMS涂层的制备及性能∗[J].中国表面工程,2021,34(4):53~59
XUE Xinyu,YIN Zhengsheng,JIANG Yongfeng,BAO Yefeng,YANG Ke.Preparation and Properties of TiO2 / PDMS Anticorrosion Superhydrophobic Coating on Carbon Steel[J].China Surface Engineering,2021,34(4):53~59
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碳钢表面防腐超疏水TiO2/PDMS涂层的制备及性能∗
薛鑫宇1, 尹正生1, 蒋永锋1,2, 包晔峰1, 杨可1
1.河海大学机电工程学院 常州 213022;2.江苏省风电机组结构工程中心 南京 211100
摘要:
针对碳钢腐蚀电位相对更负、更容易发生腐蚀的特点,在 Q235 钢表面制备超疏水 TiO2 / PDMS 涂层以提高其耐蚀性能。 采用表面活性剂分散纳米 TiO2 并进行改性,然后与 PDMS 混合,用溶胶凝胶法在 Q235 钢表面制备有聚二甲基硅氧烷 (PDMS)过渡层的 TiO2 / PDMS 超疏水涂层。 借助扫描电镜(SEM)、接触角测量仪、红外光谱(FT-IR)及 X 射线衍射仪(XRD) 表征其表面涂层的表面形貌、化学成分及疏水性能,用电化学试验和浸泡试验测试其防腐性。 结果表明:TiO2 / PDMS 涂层表面具有独特的微纳结构,与水的接触角达到 154. 3°;其腐蚀电位由碳钢的-0. 77 mV 正移至超疏水涂层的-0. 24 mV,腐蚀电流密度则下降两个数量级,即从 5. 02×10-6 A·cm-2下降至 3. 95×10-8 A·cm-2 ;超疏水涂层的交流阻抗值高于碳钢基底 3 个数量级。 经过 7 d 的 3. 5wt. %NaCl 溶液浸泡,超疏水涂层并未发生失重。 制备的 TiO2 / PDMS 超疏水涂层具有超疏水效果和良好的长期耐腐蚀性。
关键词:  超疏水表面  聚二甲基硅氧烷  溶胶凝胶法  耐腐蚀
DOI：10.11933/j.issn.1007-9289.20210227001
分类号:TG174
基金项目:国家自然科学基金(51879089)、江苏省沿海开发与保护协同创新中心([2013] 56)、江苏省研究生科研与实践创新计划(KYCX21_0471) 资助项目
Preparation and Properties of TiO2 / PDMS Anticorrosion Superhydrophobic Coating on Carbon Steel
XUE Xinyu1, YIN Zhengsheng1, JIANG Yongfeng1,2, BAO Yefeng1, YANG Ke1
1.College of Mechanical and Electrical Engineering, Hohai University, Changzhou 213022 , China;2.Jiangsu Province Wind Power Structural Research Center, Nanjing 211100 , China
Abstract:
In order to improve the corrosion resistance of Q235 steel, superhydrophobic TiO2 / PDMS coating was prepared on Q235 steel to improve its corrosion resistance. The nano-TiO2 was modified by surfactant to avoid the agglomeration problem caused by its small surface energy. After the polydimethylsiloxane (PDMS) transition layer was prepared on the surface of Q235 steel, the TiO2 / PDMS superhydrophobic coating was prepared on the surface of Q235 steel by sol-gel method after mixing the modified TiO2 with PDMS. Scanning electron microscope ( SEM), contact angle meter, infrared spectrum (FT-IR) and X-ray diffraction(XRD) were used for characterization. Corrosion resistance was tested by electrochemical experiment and immersion test. The results indicate that: the surface of TiO2 / PDMS coating has a unique micro / nano structure with the water contact angle of 154. 3°, which proves the coating with excellent superhydrophobic property was prepared. The electrochemistry results showed that compared to the bare Q235, the coating prepared has good corrosion resistance with a positive shifted corrosion potential(from -0. 77 mV to -0. 24 mV), a decline in the corrosion current density(from 5. 02×10-6 A·cm-2 to 3. 95×10-8 A·cm-2 , up to two orders of magnitude) and a increased alternating current impedance(three orders of magnitude). The base material protected by the coating is identified for a fine long-term corrosion resistance due to the no weight loss after the 7 days immersion in 3. 5wt. % NaCl solution. TiO2 / PDMS superhydrophobic coating successfully prepared on Q235 steel surface by sol-gel method has superhydrophobic effect and good long-term corrosion resistance.
Key words:  superhydrophobic surface  polydimethylsiloxane (PDMS)  sol-gel method  corrosion resistance.
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