【作者】 张文广； 杨丽霞； 冯军；

【Author】 ZHANG Wenguang1,YANG Lixia* , FENG Jun1 School of Materials Chemistry and Engineering, China University of Geosciences, Wuhan 430074, China)

【机构】 中国地质大学材料科学与化学工程学院应用化学系；

【摘要】 硅烷偶联剂在金属表面的吸附机制及成膜动力学过程是决定界面粘结性能的关键因素,对其成膜动力学过程的认识有助于我们获得理想的硅烷膜层。本文采用反射吸收红外光谱仪、原子力显微镜及中性盐雾腐蚀试验,研究了Si-O-Fe与Si-O-Si在金属表面成键反应的竞争与协同作用及Si-O-Fe的形成对相邻化学键形成的影响机制。结果表明:吸附到金属表面的硅醇单体更易与金属表面的羟基发生化学键合反应(Si-O-Fe),自身的缩聚反应(Si-O-Si)较难发生;Si-O-Fe的形成使得其上的硅醇被活化,可促进其与相邻硅醇单体的缩聚反应;金属表面羟基的引入可提高Si-O-Fe的化学键合密度及硅烷膜的耐蚀性能。更多还原

【Abstract】 The adsorption process and film-forming kinetics of silane coupling agent on the metal surface is a key factor determining the interfacial bonding performance, discussion to the key factor profoundly will help us obtain silane films with excellent anticorrosive property. In this paper, Infrared reflection absorption spectrometry, atomic force microscopy and neutral salt spray corrosion testing, study the competitive reaction during the processes of film forming including Si-O-Si and Si-O-Fe bond. We found that silanol molecular absorbed on the metal was easy to react with hydroxyl group to form Si-O-Fe bond, compared with condensation reaction among silanol molecules. Si-O-Fe bond formed on the metal could facilitate the Si-O-Si bond formation furthely. The introduction of the OH on the metal surface could improve the density of the Si-O-Fe chemical bonding, which could intensify the corrosion resistance of the Silane film to a certain extent.更多还原