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采用傅立叶变换红外光谱分析了2A12-T6铝合金表面自组装双-(!-三乙氧基硅丙基)四硫化物硅烷偶联剂(SCA)薄膜结构特征,并采用电化学极化曲线评价了薄膜的耐蚀性能.结果表明,铝材表面自然晾干,SCA薄膜分子之间主要通过氢键连接,腐蚀电流密度减小1个数量级以上.120℃的加热处理促进铝板表面通过SiOSi链接而形成SCA网状薄膜结构,并通过在界面上形成SiOAl界面相结构而与铝板表面牢固连接,腐蚀电流密度降低2个数量级以上.SCA乙醇溶液浸泡处理10min比浸泡2s～1min的铝板表面SCA薄膜内氢键缔合羟基要多.
The structural characteristics of the self-assembled bis (triethoxysilylpropyl) tetrasulfide silane coupling agent (SCA) on 2A12-T6 aluminum alloy surface were analyzed by Fourier transform infrared spectroscopy. The electrochemical polarization curve The results show that the surface of aluminum is naturally dried and the molecules of SCA are mainly connected by hydrogen bonds and the corrosion current density is reduced by more than one order of magnitude.The heat treatment at 120 ℃ promotes the surface of the aluminum plate through the SiOSi link The SCA network structure was formed and the corrosion current densities decreased more than two orders of magnitude by forming the SiOAl interface phase structure on the interface and the corrosion current density was reduced by more than two orders of magnitude.SCA ethanol solution immersed for 10min longer than that of 2s ~ Hydrogen bond more hydroxyl.