自清洁、耐腐蚀和防冷冻的三维网络状疏水铝合金表面的制备  

Preparation of self-cleanable, anticorrosive, and freeze-proof aluminum alloy surface with three-dimensionalreticular texture and hydrophobicity

作　　者：汤超 吴昊[1,2] 何卫 王利民[1,2] 楼平 岳灵平[3] TANG Chao;WU Hao;HE Wei;WANG Limin;LOU Ping;YUE Lingping(Nanrui Group Co.,Ltd.(State Grid Electric Power Research Institute Co.,Ltd.),Nanjing 211106,China;Wuhan NARI Limited Liability Company,State Grid Electric Power Research Institute,Wuhan 430074,China;Huzhou Power Supply Company,State Grid Zhejiang Electric Power Company,Huzhou 313000,China)

机构地区：[1]南瑞集团有限公司(国网电力科学研究院有限公司),江苏南京211106 [2]国网电力科学研究院武汉南瑞有限责任公司,湖北武汉430074 [3]国网浙江省电力有限公司湖州供电公司,浙江湖州313000

出　　处：《电镀与涂饰》2023年第16期17-22,共6页Electroplating & Finishing

基　　金：国家电网公司科技指南项目(SGZJ0000KXJS2100125)。

摘　　要：提出了一种制备自清洁、耐腐蚀和防冷冻的疏水铝合金表面的方法。首先,将铝合金薄片放置于含金属镍前驱体和硬脂酸的溶液中,通过直流电沉积形成微-纳米尺寸的低表面能金属/金属氢氧化物,获得一级保护层;再利用石墨烯-聚合物前驱体制得三维网络状复合物进行表面改性,获得二级保护层。疏水涂层的微-纳米结构能截留空气,形成稳定的空气层,有效降低表面与外界的接触面积,形成物理隔离,从而达到保护金属基体的目的。经疏水涂层修饰后的5052铝合金表面对水的接触角大于90°,在3.5%NaCl溶液中的腐蚀电流密度比未处理的铝合金降低了1个数量级,在-5°C下表面结冰的时间比修饰前推迟了约32 min。该方法操作简单,反应条件温和,耗时短,原料低廉,适合工业化应用。A method for preparing a hydrophobic aluminum alloy surface with self-cleaning property,corrosion resistance,and freezing resistance was proposed.Firstly,micro-/nano-sized metal/metal hydroxide composites with low surface energy are formed on aluminum alloy sheet by direct-current electrodeposition in a solution containing nickel precursors and stearic acid to obtain a first protective layer.Secondly,a three-dimensional reticular composite is prepared from graphene–polymer precursor for surface modification to obtain the secondary protective layer.The micro-nano structure of hydrophobic coating can intercept air,forming a stable air layer which effectively reduces the contact area between its surface and the medium in the environment,and form a physical barrier,achieving the goal of protecting the metal substrate.The 5052 aluminum alloy modified with hydrophobic coating had a contact angle greater than 90°with water,and as compared with the untreated one,its corrosion current density was one order of magnitude smaller in 3.5%NaCl solution,and the freezing time of water droplet on its surface was delayed for 32 min at−5°C.This method features simple operation,mild reaction conditions,short time consumption,and low-cost raw materials,and is suitable for industrial application.

关 键 词：铝合金 镍电沉积 石墨烯气凝胶 微纳结构 疏水性 耐腐蚀 防冷冻 双层保护 

分 类 号：TG178[金属学及工艺—金属表面处理] TS914.13[金属学及工艺—金属学]