## Aluminium specimens were anodized galvanostatically in a thermostated and vigorously stirred bath of H,SO, 15% w/v at different bath temperatures and current densities and for long anodization times, suflicient to produce the maximum or near maximum limiting film thickness, and the anodic poten
Microstructure of Porous anodic films on aluminium
β Scribed by Dr. H. Bestgen; T. Willems; Dr. M. Osterhold
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- German
- Weight
- 477 KB
- Volume
- 48
- Category
- Article
- ISSN
- 0947-5117
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β¦ Synopsis
Abstract
Optical microscopy (OM), scanning electron microscopy (SEM) and analytical transmission electron microscopy (AEM) were used to characterise anocid films on aluminium. Of special interest in our investigations was to study the dependence of the microstructure of the films on the current density at sampleβpreparing. The results show that the size of the pores increases with increasing current density.
π SIMILAR VOLUMES
The temperature distribution alongthe vertical pores of the anodicoxide films onalumhrium was calculated for usual conditions of anodizing in 10% sulphuric acid solution by taking into account the accumulation of both Joule heat and the heat of formation of oxide at the pore-base and the outward con
The mechanism of growth of porous anodic AI,O, films at various bath temperatures, current densities and H,SO, concentrations was studled for tiims produced in a vigorously stirred bath at anodization times higher than those at which the maximum pore diameter behind or at film surface approaches fir
A strict kinetic model, governing the growth of porous anodic 01 2 0 3 films, was developed in a form easily and directly applicable to a galvanostatic anodization in a stirred bath at constant temperature . It was applied to the experimental results obtained from film growth at 25 Β°C, 1SmAcm -2 and