Interpretation of the promoting effect of sulphate salt additives on the development of non-uniform pitted porous anodic Al2O3 films in H2SO4 electrolyte by a transport phenomenon analysis theory

被引:19
作者
Patermarakis, G [1 ]
Moussoutzanis, K [1 ]
机构
[1] Natl Tech Univ Athens, Dept Chem Engn, Sect Mat Sci & Engn, Athens 15780, Greece
关键词
anodising aluminium; pitting; sulphate additives effect; transport analysis theory;
D O I
10.1016/S0010-938X(01)00180-9
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The equations describing the mass and charge transport phenomena and composition of the solution at pore bases during the reglllar/uniform growth of porous anodic alumina films in pure H2SO4 solution were suitably solved to describe them in H2SO4 +Al-2(SO4)(3) solution. The current densities at which the H2SO4 concentration becomes minimum at low film thicknesses were determined which coincided with the experimental ones above of which pitting appears. They decreased with the Al-2(SO4)(3) concentration. A theory was formulated explaining the promoting, effect of sulphate additives on pitting appearance which is important to develop methods for producing regularly grown high quality films. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
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页码:1737 / 1753
页数:17
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