铝合金表面抗腐蚀薄膜的制备及性能研究

Research on Preparation and Property of Anti-Corrosion Film on Surface of Aluminum Alloy

摘要:

本文采用分子自组装法在铝合金表面制备了3-氨基丙基三乙氧基硅烷(KH550)膜、KH550/氧化石墨烯(GO)复合薄膜。借助扫描电子显微镜(SEM)、拉曼光谱仪(Raman)和傅立叶红外光谱仪(FTIR)表征了样品表面形貌和微结构，通过电化学工作站测试了样品腐蚀电位和腐蚀电流密度。结果表明KH550的氨基(-NH2)与GO的羧基(-COOH)发生缩合反应，使KH550与GO成功接枝。KH550硅烷膜和KH550/GO复合薄膜与铝合金发生了化学反应，生成了Si-O-Al键，增加了薄膜粘附力；同时两种薄膜均有效提高了铝合金抗腐蚀性。

Abstract:

3-Triethoxysilylpropylamine(KH550) film and KH550/graphene oxide(GO) composite film were prepared on aluminum alloy by Self-Assembly Moleculars(SAM). Surface morphology and microstructure of the samples were characterized by SEM, Raman and FITR. Corrosion potential and current density of the samples was also tested by the electrochemical workstation. The results showed that a condensation reaction took place between amino groups(-NH2) of KH550 and carboxy groups(-COOH) of GO, which made success combination of KH550 and GO. The adhesion ability of film was enhanced for the chemical reaction between film and aluminum alloy which led to the generation of Si-O-Al linkage. Moreover, the corrosion resistance of aluminium alloy was effectively improved by the two kinds of films.