作　　者： ; ; ; ;

机构地区： 四川大学化学工程学院

出　　处： 《功能材料》 2009年第6期1053-1055,共3页

摘　　要： 在(NH4)2SO4/NH4F电解液中,采用阶段升压至预定电压,然后恒压阳极氧化在Ti6Al4V表面制备出纳米多孔氧化膜。利用SEM、XRD对纳米多孔氧化膜进行表征。研究表明,电解液pH值和外加电压对纳米多孔氧化膜形成和形貌影响非常大。电解液的pH值=4.0,恒压为20V时,形成孔均匀规整的纳米多孔氧化膜,孔内径约为85nm。纳米多孔氧化膜形成机理是:首先钛合金表面钝化,在F-作用下钝化表面发生孔蚀而形成原始胚胎孔,然后胚胎孔处氧化膜在电场支持下发生场致溶解而成大孔。 Nano-porous anodic membranes were prepared by the electrochemical anodie oxidation on Ti6A14V surface in （NH4）2SO4/NH4F electrolyte. The voltage went up with certain pace until preset value. The nanoporous anodic membranes were characterized by X-ray diffraction （XRD）, scanning electronic microscopy （SEM）. The results of the experiment indicate that the pH of the electrolyte and the voltage have a significant influence on the formation and morphology of the nano-porous anodic membrane. When the pH of the electrolyte is 4.0 and the constant voltage is 20V, the pores of nano-porous anodic membrane are regular and well-organized and the inner diameter of the pore is about 85nm. The formation mechanism of nano-porous anodic membrane is as follows： firstly, the surface of alloy is passivated. Then the primary embryonic pores are formed by pitting corrosion because of the function of F-. Finally, the passivating membrane, nearby the primary embryonic pores, is field-dissolved by the activity of voltage.

关 键 词： 纳米多孔氧化膜 阳极氧化 孔蚀

领　　域： [理学] [理学]