铝管表面有机硅烷及其掺杂钝化研究  

Study on Organic Silane and Its Hybrid Passivation for Aluminum Tube

作　　者：梁永煌[1] 满瑞林[1] 肖围[1] 宋维鑫[1] 

机构地区：[1]中南大学化学化工学院,长沙410083

出　　处：《涂料工业》2010年第10期61-65,共5页Paint & Coatings Industry

基　　金：长沙市科技成果产业化立项资助(K0902110-11)

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。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 passi- rated 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. Tale1 polarization cmwes in electrochemical tests indicated that the presence of passivation coating on the aluminum tube reduced signifcantly 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 RollS directive. It＇s safety and environmental friendly. The formula and process shows good prospects for industrial applieations.

关 键 词：烯烃烷氧基硅烷 杂化膜 耐蚀性 安全环保 

分 类 号：TQ639.1[化学工程—精细化工]