激光烧蚀压印制备疏水铝箔表面的耐久性

Durability of hydrophobic aluminum foil surfaces prepared by laser ablation imprinting

提出了一种激光烧蚀压印技术制备具有多级微结构的疏水铝箔表面。该技术利用激光直接辐照在工件表面,利用烧蚀诱导的冲击压印获得一级微结构,同时利用烧蚀诱导的融化材料的流动获得二级微结构。为了检验耐久性,对疏水铝箔工件进行了酸碱腐蚀实验和不同环境存储实验。实验结果表明,酸碱腐蚀会破坏工件表面的微观形貌和低表面能,因此工件接触角随着腐蚀时间增长而降低。其中碱腐蚀工件时反应比酸腐蚀剧烈得多,工件表面形貌受损也更大,工件表面在碱腐蚀16 h后就达到了超亲水状态(25°),而酸腐蚀24 h后也依然表现为疏水性(97°)。再次进行时效处理后,工件依然能在三周后达到稳定的疏水状态,但疏水性能比腐蚀前要差,且酸腐蚀工件的最终疏水性(120°)比碱腐蚀工件(105°)要好。不同存储环境对工件表面形貌几乎没有影响。存储在空气中的工件接触角无明显变化,存储在盐水中的工件丧失疏水性(87°),存储在纯水中的工件表现比盐水稍好(96°)。再次进行时效处理后,纯水存储的工件接触角可以恢复到135°左右,而盐水存储的工件仅能恢复到120°。激光烧蚀压印制备的疏水铝箔基本能够满足应对复杂环境的要求。

A laser ablation imprinting technique was proposed to prepare hydrophobic aluminum foil surfaces with multilevel microstructures.This technique used the laser to directly irradiate on the surface of the workpiece,and the primary microstructure was obtained by ablation-induced shock imprinting,and the second microstructure was obtained by the flow behavior of the ablation-induced melting material.To assess the durability,acid and alkali corrosion experiments were conducted on the hydrophobic aluminum foil workpieces,as well as storage experiments under different conditions.The experimental results show that acid and alkali corrosion destroys the micro-morphology and low surface energy of the workpiece surface,thus reducing the contact angle of the corroded workpieces as the corrosion time increases.The reaction in alkali corrosion was much more intense than in acid corrosion,causing more significant damage to the surface morphology.The surface of the workpieces reached a super-hydrophilic state after 16 h of alkali corrosion(25°),while maintaining hydrophobicity after 24 h of acid corrosion(97°).After aging treatment,the workpieces still achieved a stable hydrophobic state after three weeks,but the hydrophobic performance was worse than before corrosion,with acid-corroded workpieces(120°)maintaining better final hydrophobicity than alkali-corroded ones(105°).Different storage environments had little impact on the surface morphology of the workpieces,but organic substances adsorbed on the surface dissolved in the liquid,thus affecting wettability in pure water and saltwater storage.The contact angle of workpieces stored in air showed no significant change,the workpieces stored in saline almost lose hydrophobicity(87°),and the samples stored in pure water perform slightly better than saline(96°).After another aging treatment,the contact Angle of the workpiece stored in pure water can be restored to about 135°,while the workpiece stored in saline water can only be restored to 120°.The hydrophobic aluminum foil prepared by laser ablation embossing can basically meet the requirements of dealing with the complex environment.