Structure and Growth Mechanism of Porous Anodic Oxide Films
Structure and Growth Mechanism of Porous Anodic Oxide Films
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多孔阳极氧化膜的结构及生长机制
DOI：
10.1380/jsssj.19.790
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
S. Ono
中科院分区：
文献类型：
--
作者：
S. Ono
综述了近年来在铝、镁表面形成多孔阳极膜的结构和生长机理方面的研究进展和基本情况。厚阳极膜的生长是在金属/膜界面形成氧化物和在孔基上电场辅助溶解氧化物的平衡过程中进行的。由于均匀的孔隙分布与施加电压成反比，薄膜的六角形柱状电池结构的电池尺寸与形成电压几乎成正比。更确切地说，电池尺寸是电压和电场强度的函数。电解质阴离子在电场的作用下进入薄膜。多孔膜的缺陷是由铝脊上孔基与孔芯三相点之间的微击穿钻孔效应形成的。适当的电解电压和铝表面的化学织构可以显著改善多孔阳极氧化铝电器件材料的长程有序排列。对于镁上的阳极膜生长，证实了类似于凯勒阳极氧化铝模型的圆柱形孔结构。它主要是由MgF2和Mgx+y/ ox (OH)y在金属/膜界面的形成和膜在孔底的溶解进行的。
Recent research development and fundamental aspects on the structure and growth mechanism of porous anodic films formed on aluminum and magnesium are reviewed. Thick anodic film growth proceeds with the balance of oxide formation at the metal/film interface and the field-assisted dissolution of oxide at pore bases. Hexagonal cylindrical cell structure of the film, in which cell size is nearly proportional to the formation voltage, is attained as a result of inversely proportional uniform pore distribution to the applied voltage. More exactly, cell dimension is a function of voltage and electric field strength. Electrolyte anions are incorporated into the film under the effect of electric field. Defects in porous films are formed by the drilling effect of micro-breakdown between pore bases and triple points of cells on aluminum ridges. Long-range ordering of cell arrangement of porous anodic alumina for electric devise materials is signifi-cantly improved by appropriate electrolysis voltages and chemical texturing of aluminum surface. For the anodic film growth on magnesium, the cylindrical pore structure which is similar to the Keller's model of anodic alumina is confirmed. It proceeds mainly by the formation of MgF2 and Mgx+y/2Ox(OH)y at the metal/film interface and the dissolution of the film at pore bases.