铝合金表面构建超疏水性的化学改性机理  

Mechanism of chemical modification for fabricating superhydrophobic aluminum alloy

作　　者：吴洁[1,2] 余新泉[1,2] 张友法[1,2] 周荃卉[1,2] 

机构地区：[1]东南大学材料科学与工程学院,南京211189 [2]东南大学江苏省先进金属材料高技术研究重点实验室,南京211189

出　　处：《东南大学学报（自然科学版）》2011年第5期1036-1041,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51101035;51106023);江苏省先进金属材料高技术研究重点实验室开放基金资助项目(AMM-201001)

摘　　要：系统研究了刻蚀-化学改性两步法中的蒸镀改性工艺对铝合金表面形貌和润湿性的影响,提出了刻蚀与化学改性同时进行的一步浸泡法制备超疏水铝合金.结果表明,两步法蒸镀改性工艺中,硬脂酸端部的极性亲水羧基与铝合金表面羟基以共价键结合,从而在铝合金表面形成一层硬脂酸膜,使铝合金实现低表面能化,水滴在其表面处于Cassie状态,接触角为160°.一步法中,高能区域优先溶解形成的铝离子与肉豆蔻酸分子结合,形成外部具有疏水长烷烃链的羧酸盐,沉积在基片表面,同样使得铝合金表面具有低黏附和超疏水性.该工艺优化后对其他长链脂肪酸均具有普适性.The influence of evaporation process in a two-step modification approach of aluminum alloy was studied systematically.A one-step approach is proposed by combining roughening and modification in two-step method.Results show that,in the evaporation process of the two-step method,the carboxyls of stearic acid covalently bond with the hydroxyls on aluminum surface,generating a superhydrophobic film with low surface energy.Water droplet contacts the sample in Cassie state,which shows a high contact angle of 160°.While in the one-step approach,dissolved aluminum ion can be caught by the myristic acid,and thereafter carboxylate deposits,leaving the hydrophobic long-chain alkanes outwards.The aluminum substrates again display water repellency.Both optimized modification processes are proved to be universal for other kinds of long-chain fatty acids to prepare low-adhesion superhydrophobic surface on aluminum alloy.

关 键 词：铝合金 超疏水性 化学改性 长链脂肪酸 

分 类 号：TG17[金属学及工艺—金属表面处理]