超疏水钛合金表面制备及其抗海洋生物附着性能

Preparation of Superhydrophobic Titanium Alloy Surface and Its Antifouling of Halobios

为提高钛合金抗海洋生物附着性能,采用激光刻蚀技术在Ti6Al4V合金表面构建不同间距的微米级点阵结构,利用聚合物基纳米复合材料构建微/纳双层结构,制备超疏水Ti6Al4V合金表面。用光学显微镜和扫描电镜表征其形貌;用接触角测量仪测量试样的表面接触角;用浅海挂板的方法测试试样的抗海洋生物附着污损性能。结果表明,具有单一微结构的Ti6Al4V合金表面为疏水表面。随着点阵间距的减小,接触角增大。当间距为50μm时,接触角可达131.8o,但试样的表面滚动角较大,将试样竖直甚至翻转,水滴都不滚落;具有微/纳双层结构的Ti6Al4V合金表面为超疏水表面,且随着点阵间距的减小接触角增大,滚动角减小。当间距为50μm时,接触角达163.8o,滚动角仅为1.89o。具有微/纳双层结构的超疏水Ti6Al4V合金表面抗海洋生物附着污损性能显著优于抛光Ti6Al4V合金表面及具有单一微结构的Ti6Al4V合金表面。

In order to improve the resistance of titanium alloy on antifouling of halobios, a laser etching technique was used to build micro-structure with different spacing on Ti6Al4V alloy surface. Polymer-based nanocomposites were coated on the micro-structure to build the micro-nano structure for the superhydrophobic surface of Ti6Al4V alloy. The morphology was investigated by optical microscope and scanning electron microscopy. The contact angles and roll angles were measured by contact angle measurement. Sea-site exposure test was conducted to evaluate its antifouling performance. The results show that the Ti6A14V alloy surface with a single micro structure is hydrophobic. The contact angles increase with spacing decreasing. When the spacing is 50 μm, the contact angle is as high as 131.8°. But the roll angle is large. Even if the surface is placed vertically or invert, the droplet does not roll. The Ti6Al4V alloy surface with the micro-nano structure is superhydrophobic. The contact angles increase and the roll angles decrease with the spacing decreasing. When the spacing is 50 μm, the contact angle is as high as 163.8°, while the roll angle is only 1.89°. The antifouling performance of superhydrophobic surface with micro-nano structure is significantly superior to that of polishing surface and the surface with a single micro structure.