摘要： 采用单一烯烃烷氧基硅烷、硅烷掺杂长链有机酸酯分别对铝管表面进行钝化,得到硅烷膜和杂化膜。硫酸铜点滴实验、析氢实验和盐雾试验对其耐蚀性测定表明,杂化膜的耐蚀性优于硅烷膜和常规铬酸盐钝化膜。电化学Tafel极化曲线测定显示,钝化膜的存在使铝的自腐蚀电流密度显著降低,有效降低了铝的腐蚀速率。金相显微镜和原子力显微镜(AFM)扫描发现,杂化膜由大量无定形的固体颗粒不均匀沉积而成,表面显得致密均匀。经检测,硅烷掺杂钝化液中不含重金属和氟化物,满足欧盟RoHS指令要求,安全环保,该配方和工艺具有良好的工业应用前景。

关键词: 烯烃烷氧基硅烷, 杂化膜, 耐蚀性, 安全环保

Abstract: The silane film and hybrid film on aluminum tube treated with olefin -alkoxy silane and silane doped with long chain organic acid ester were obtained by chemical immersion. Corrosion resistance of passivated aluminum tube was examined by bluestone drips test, hydrogen release test and salt spray test, which showed that the corrosion resistance of hybrid film was superior to silane film and conventional chromate passivation film. Tafel polarization curves in electrochemical tests indicated that the presence of passivation coating on the aluminum tube reduced significantly the corrosion current density and lower effectively the corrosion rate. Metallographic microscope and atomic force microscope (AFM)scan found that the hybrid film was formed by a large number of non-uniform deposition of amorphous solid particles, the surface was extremely dense and uniform. Passivation solution of silane contains no heavy metals and fluoride, meeting the EU ROHS directive. It's safety and environmental friendly. The formula and process shows good prospects for industnal applcations.

Key words: olefin-alkoxy silane, hybrid film, corrosion resistance, safety and environmental friendly