排水管道表面激光制备自清洁仿生结构的工艺与机理研究

Research on the Technology and Mechanism of Laser Generated Self-Cleaning Bionic Structures on the Surface of Drainage Pipes

针对球墨铸铁排水管道提出一种复合激光化学法制备超疏水微/纳结构的方法,采用飞秒脉冲激光刻蚀获取不同扫描速度下的微/纳结构,通过工艺探索对激光刻蚀参数和表面形貌进行优化。结果表明,微结构周期性完整,表面主要由纳米颗粒、裂纹和波纹组成,当激光加工速度小于225 mm/s时,试样表现出超疏水性,接触角最大可达161.3°±1.2°;当加工速度小于150 mm/s时,具有显著的自清洁特性,滑移角最小可达6.8°±2.1°。同时对不同工艺制备试样的化学耐久性和耐腐蚀性进行了比较,为球墨铸铁排水管道保护和再利用的模式与路径探索提供了新的思路与方法。

In this paper,a composite laser chemical method for preparing super hydrophobic micro/nano structures for ductile i-ron drainage pipes is proposed.Femtosecond pulse laser etching was used to obtain micro/nano structures at different scanning speeds.The results show that the microstructure is periodic and complete,and the surface is mainly composed of nano parti-cles,cracks and ripples.When the laser processing speed is less than 225 mm/s,the sample shows superhydrophobicity,and the maximum contact angle can reach 161.3°±1.2°.When the machining speed is less than 150 mm/s,it has significant self-cleaning characteristics,and the minimum slip angle can reach 6.8°±2.1°.At the same time,the chemical durability and cor-rosion resistance of samples prepared by different processes are compared,which provides a new idea and method for exploring the modes and pathways of protection and potential reuse of ductile iron drainage pipes.