Self-organization of anodic aluminum oxide layers by a flow mechanism

被引：12

作者：

Mishra, Pratyush ^{[1
]}

Hebert, Kurt R. ^{[1
]}

机构：

[1] Iowa State Univ, Dept Chem & Biol Engn, Ames, IA 50011 USA

来源：

ELECTROCHIMICA ACTA | 2020年 / 340卷

关键词：

Porous anodic oxide; Anodization; Pattern formation; Morphological instability; Plastic flow; TRANSPORT NUMBERS; IONIC TRANSPORT; INITIAL GROWTH; VALVE METALS; FILMS; SULFATE; STRESS; INSTABILITY; ANODIZATION; ADSORPTION;

D O I：

10.1016/j.electacta.2020.135879

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Anodic oxidation of aluminum in solutions that dissolve the amorphous oxide produces films with hexagonally-ordered patterns of pores. We show using linear stability analysis that an anodization model including viscous oxide flow accurately predicts the scaling relation governing pore spacing. Flow is driven by nonuniform compressive stress near the oxide-solution interface, resulting from anion adsorption on surface growth sites. The interfacial stress layer is approximated as surface stress, leading to analogous instability mechanisms as in the surface-tension driven Marangoni instability of thin liquid films. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页数：9

共 50 条

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