助溶剂对铝合金表面硅烷化预处理的影响

为了了解3-缩水甘油醚丙基三甲氧基硅烷(γ-GPTMS)溶液中助溶剂对水解的γ-GPTMS在铝合金表面的沉积特性的影响,用X射线光电子衍射(XPS)测定了不同助溶剂含量,不同γ-GPTMS浓度的溶液沉积在铝合金表面的硅含量,同时用反射吸收红外光谱(RAIRS)对铝合金表面膜层进行了表征,结果表明,助溶剂对γ-GPTMS在铝合金表面沉积有显著影晌,γ-GPTMS的纯水溶液在铝合金表面所形成硅烷化膜层的硅元素量最高,沉积量随溶液中γ-GPTMS浓度的增加而增加。另外,膜层与氧化的铝合金表面之间形成铝硅氧烷(Al-O-Si)共价键,而且γ-GPTMS分子中的烷氧乙基分布在膜层的外表面,具有较大的反应活性。

The influence of the cosolvent on the silanizing pretreatment for aluminum alloy surface

In order to understande the effects of cosolvent in the solution of 3-glycidoxypropyltrimethoxy silane (γ-GPTMS) on hydrolysed γ-GPTMS the deposited property on the aluminum alloy surface,the content of silicon element depositing on the aluminum alloy surface emanating from the solution of the various cosolvent ratio and concentration of γ-GPTMS were determined by X-ray photoelectron spectroscopy(XPS), meanwhile. The silanizing film layer on the aluminum alloy surface was charactered by the reflection-absorption infrared spectroscopy (RAIRS). The results showed that the cosolvent affect evidently the deposition of γ-GPTM on aluminum alloy surface and the silicon content of silanizing film layer depositing on aluminum alloy surface from pure water solution of γ-GPTM was highest,the deposition content was enhanced as the concentration of γ-GPTM was increased. Otherwise the aluminum siloxane (Al-O-Si)covalent bond between oxidized aluminum alloy surface and film layer was formed,the epoxy of molecule of γ-GPTM arrange on the outer surface of film layer. And the reactive reactivity of film layer surface is greater.