文献类型：期刊文献

中文题名：6061铝合金表面氟钛酸盐协同硅烷复合膜的结构及缓蚀机理

英文题名：Structure and Corrosion Inhibition Mechanism of Fluotitanate Synergistic Silane Composite Membrane on the Surface of 6061 Aluminum

作者：娄淑芳[1];马国扬[2];李红玲[2]

第一作者：娄淑芳

机构：[1]商丘医学高等专科学校公共学科部;[2]新乡学院化学化工学院

第一机构：商丘医学高等专科学校公共学科部,河南商丘476000

年份：2018

卷号：51

期号：8

起止页码：42-46

中文期刊名：材料保护

外文期刊名：Materials Protection

收录：CSTPCD;;北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

基金：河南省科技发展计划项目(1521023102122)资助

语种：中文

中文关键词：6061铝合金;硅烷-氟钛酸盐复合膜;氟钛酸盐;结构;缓蚀机理

外文关键词：6061 aluminum alloy;silane- fluotitanate composite membrane;fluotitanate;structure;corrosion inhibition mechanism

摘要：为了提高铝合金的耐蚀性,采用无机物氟钛酸盐协同硅烷转化液在6061铝合金表面制备了硅烷-氟钛酸盐复合膜,通过扫描电镜(SEM)和能谱(EDS)对比了复合膜和氟钛酸盐转化膜的表面形貌及元素组成;用原子力显微镜(AFM)对比了复合膜和氟钛酸盐转化膜表面的均方根粗糙度;采用红外光谱(FTIR)和X射线光电子能谱(XPS)确定了复合膜的结构。结果表明:C,O,F,Al,Si,Ti,N是复合膜的主要组成元素,复合膜是由Si-O-Si,Si-O-Al等共价键形成的三维网状结构以及钛的氧化物TiO_2组成的;复合膜表面微突起结构的存在使得膜层表面的粗糙度增大,疏水性增强,因此耐蚀性能增强。最后对膜层的缓蚀机理进行了初步的探讨,得出:硅烷水解的羟基和钛盐钝化膜的氢氧根会发生反应,形成Si-O-M键,同时自身缩合形成的网状交联膜封闭钛盐膜表面的缺陷和空隙,阻碍氧与空气的进入,进一步提高了钛盐膜的耐蚀能力。
In order to improve the corrosion resistance of aluminum alloy, the silane-fluotitanate composite membrane was prepared on the surface of 6061 aluminum alloy by using organofluorotitanate synergistic silane conversion solution. The surface morphology and elemental composition of the composite films and the fluotitanate conversion films were compared by scanning electron microscope （SEM） and energy dispersive spectrum （EDS）. The root mean square roughness of the composite films and the fluotitanate conversion films was studied and compared by atomic force microscope （AFM）. In addition, FTIR and XPS were used to determine the structure of the membrane. Results showed that C, O, F, Al, Si, Ti and N were the main components of the composite film. The composite film was a three-dimensional network formed by covalent bonds of Si-O-Si and Si-O-Al as well as titanium oxide TiO2 composition. The existence of microprotrusions on the surface of the composite membrane increased the roughness of the surface of the membrane, which increased the hydrophobicity and enhanced the corrosion resistance. Besides, corrosion inhibition mechanism of the film was initially discussed. The hydroxyl groups hydrolyzed by silane reacted with the hydroxides of the titanium salt passivation film to form Si-O-M bonds. At the same time, the mesh cross - linking film formed by selfcondensation closed the defects and voids on the surface of the titanium salt film, hindering the entrance of oxygen and air.The corrosion resistance of titanium salt film was further improved.