白炭黑—氟碳漆复合超疏水涂层的制备及其在金属防腐蚀中的应用

Preparation of White Carbon Black-Fluorocarbon Paint Composite Super-hydrophobic Coating and its Application on Metal Corrosion Protection

以疏水性白炭黑粒子、氟碳漆、丙酮等为原料,提出复合超疏水涂层制备方案,评估其应用于金属防腐蚀的可行性。通过控制原料质量比,将疏水性白炭黑粒子溶解于丙酮溶液,制备出白炭黑自组装分散液,作为表层;采用旋涂法,通过白炭黑提升氟碳漆本体的疏水性,作为底层。通过"表—底"结合的工艺设计理念,得到具有微纳粗糙结构的白炭黑—氟碳漆复合超疏水涂层。对涂层进行疏水性分析,表明白炭黑与丙酮溶液质量比为0.025、白炭黑与氟碳漆质量比为0.3时,复合涂层接触角可达152°,滚动角小于5°,体现了优异的超疏水效果。在室内环境下对钢板进行1年的大气自然暴露腐蚀对比实验,涂层表现出优秀的防腐蚀效果。对涂层的超疏水机理进行分析,表明该"表—底"结合设计可以阻止水液在金属表面的长时间停留与持久侵蚀,阻断了金属电化学腐蚀三要素(阳极、阴极与腐蚀介质)的相互作用,形成了金属防腐蚀的闭环效应。

Using hydrophobic white carbon black particles,fluorocarbon paint and acetone as raw materials,the preparation scheme of composite super-hydrophobic coating is proposed,and the feasibility of its application in the metal corrosion protection is evaluated.By controlling the mass ratio of raw materials,hydrophobic white carbon black particles are dissolved in the acetone solution to prepare the white carbon black self-assembly dispersion,which is used as the surface layer;the spin coating method is used to improve the hydrophobicity of fluorocarbon paint body by using white carbon black as the bottom layer.The white carbon black-fluorocarbon paint composite super-hydrophobic coating with micro-nano rough structure is obtained through the process design concept of such a"surface-bottom"combination.The results show that when the mass ratio of white carbon black to acetone solution is 0.025 and the mass ratio of white carbon black to fluorocarbon paint is 0.3,the contact angle of the composite coating can reach 152°and the rolling angle is less than 5°,which reflects an excellent super-hydrophobic effect.In the indoor environment,the steel plate is subjected to atmospheric natural exposure corrosion test for 1 year,and the coating shows excellent anti-corrosion effect.The super-hydrophobic mechanism of the coating is analyzed,showing that the design of"surface-bottom"combination can prevent the water from long-time staying and lasting erosion on the metal surface,and block the interaction of three elements(anode,cathode and corrosion medium)of metal electrochemical corrosion,forming a closed-loop effect for the metal corrosion protection.