铝基表面超疏水材料的制备工艺、效果及耐蚀性

超疏水表面在自清洁材料、腐蚀防护及微流体运输等领域有着广阔的应用前景,目前对金属超疏水表面的研究较少,且制备方法较复杂,不能大面积制备。分别采用喷砂、阳极氧化、喷砂-阳极氧化等方法在铝基体表面构造粗糙结构并对其进行修饰,制备了超疏水表面,通过SEM、接触角及滚动角测定、腐蚀速率测定等分析了超疏水表面的微观形貌、疏水性能和耐海水腐蚀性能。结果表明:喷砂-阳极氧化法制备的铝金属表面具有微米-纳米二级结构,经氟化处理后,与水的接触角达158°,滚动角为1.5°,疏水性能良好;超疏水表面材料的腐蚀速率比铝材低1个数量级。

Fabrication and Corrosion Resistance of Superhydrophobic Film on Aluminum Substrate

Rough structures were prepared on Al substrate surface by blasting,anodizing and blasting-anodizing respectively.As-obtained rough structures were then modified to prepare superhydrophobic surfaces.The hydrophobicity of the superhydrophobic surfaces was measured,their morphology was observed using a scanning electron microscope,and their corrosion resistance in seawater was evaluated.It was found that unique hierarchical micro-scale and nano-scale structure was formed on Al surface after blasting-anodizing,with a water contact angle of 158° and roll-off angle of 1.5°,showing good hydrophobicity.In the meantime,the corrosion rate of the superhydrophobic surfaces was one magnitude lower than that of the Al substrate.