溶胶-凝胶法制备超疏水性纳米复合防腐涂层

Performance of Superhydrophobic Nano Complex Anticorrosion Coating Fabricated by Sol-gel Technique

通过溶胶-凝胶旋涂法在不锈钢基底上制备了具有超疏水性能的介孔碳复合SiO2涂层。通过TEM,SEM及静态接触角、电化学测试技术(Tafel和EIS)等对其结构、疏水性能和耐蚀性等进行表征。结果表明:在不锈钢基底上形成了乳突状形貌,水在涂层表面静态接触角达到163°。该超疏水性SiO2/介孔碳复合涂层具有优良的防腐性能。

Superhydrophobic complex coatings of mesoporous carbon/silica on stainless steel were prepared by a sol-gel spin cast method. The morphologies, anticorrosion property and hydrophobicity of the coatings were characterizd by means of scanning electron microscopy(SEM) and transmission electron microscopy(TEM), electrochemical test technique-Tafel curve and electrochemical impedance spectroscopy, as well as water contact angle measurement(CA) respectively. The coatings exhibited varied surface morphologies with bump-like and nipple-like protrusions on the stainless steel substrate. The coatings had a high water contact angle larger than 163°, indicating its strong hydrophobicity. The corrosion current density of the superhydrophobic complex coating coated steel was 8 order of magnitude lower than the bare steel, while its charge transfer resistance(Rct) was 6 order of magnitude higher as well, implying an excellent corrosion protectiveness. Besides, an electrochemical equivalent circuit was proposed to interpret the relevant anti- corrosion mechanism for the superhydrophobic coatings.