铝管表面硅氧膜的制备及其耐蚀性能  

Preparation of siloxane coating on surface of aluminum tube and its corrosion resistance

作　　者：黄雄[1] 满瑞林[1] 尹晓莹[1] 肖琴[1] 杨萍[1] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083

出　　处：《电镀与涂饰》2013年第1期67-71,共5页Electroplating & Finishing

基　　金：长沙市科技成果产业化立项资助项目(K0902110-11)

摘　　要：采用溶胶–凝胶法,以乙烯基三乙氧基硅烷(KH151)和正硅酸乙酯(TEOS)为前驱体、用浸渍提拉法在工业铝管表面制备了硅氧膜。通过金相显微镜观察了硅氧膜的表面形貌,通过硫酸铜点滴、盐雾试验、析氢实验和Tafel曲线、交流阻抗谱(EIS)等电化学方法对铝管表面硅氧膜的耐蚀性能进行了考察。结果表明,硅氧膜均匀、致密、平整,它使铝管的自腐蚀电位明显正移;相对于空白试样,铬钝化铝管和涂有硅氧膜的铝管的自腐蚀电流密度分别下降了1和2个数量级,硅氧膜电极体系总电阻是空白试样总电阻的6.1倍、是铬钝化膜总电阻的1.48倍。A siloxane coating was prepared on the surface of industrial aluminum tube by sol-gel method with vinyltriethoxysilane （KH151） and tetraethyl orthosilicate （TEOS） as precursors and by dip-coating method. The surface morphology of the siloxane coating was observed by metallographic microscope, and its corrosion resistance was studied by CuSO4 drop test, salt spray test, hydrogen evolution test, and electrochemical methods such as Tafel polarization curve and electrochemical impedance spectroscopy （EIS）. The results showed that the siloxane coating is uniform, compact and level, leading to a positive shift of corrosion potential of the aluminum tube. Compared with the blank sample, the corrosion current densities of the aluminum tubes with chrome passivation film and with siloxane coating are decreased by one and two orders of magnitude, respectively. The total resistance of the siloxane coating electrode system is 6.1 times that of the blank sample and 1.48 times that of the chrome passivation film.

关 键 词：铝管 硅氧膜 耐蚀性能 电化学实验 

分 类 号：TG178[金属学及工艺—金属表面处理]