Abstract
A systematic investigation has been undertaken of voltage-time behaviour for galvanostatic porous anodizing of aluminium in 0.4 mol dm-3 H2C2O4 modified by the addition of variable amounts of NH4F, in circumstances of varying current density and stirring conditions. Both the concentration of NH4F in the electrolyte and stirring of the fluoride-containing (FC) electrolyte appeared to affect the voltage-time response for anodizing aluminium, causing a decrease in the forming voltage. The voltage-reducing effect is further substantially enhanced while the solution is stirred. Despite a tenfold decrease in the anodizing voltage in the FC electrolyte, no apparent changes in pore morphology are determined from SEM observation. The phenomena described are explained by considering formation of FC electrolyte-derived species and their incorporation into growing oxide film.
| Original language | English |
|---|---|
| Pages (from-to) | 299-305 |
| Number of pages | 7 |
| Journal | Electrochemistry Communications |
| Volume | 3 |
| DOIs | |
| Publication status | Published - 2001 |
Fields of science
- 104005 Electrochemistry
- 104006 Solid state chemistry
- 104014 Surface chemistry
- 104017 Physical chemistry
- 105113 Crystallography
- 105116 Mineralogy
- 503013 Subject didactics of natural sciences
- 204 Chemical Process Engineering
- 204001 Inorganic chemical technology
- 205016 Materials testing
- 210006 Nanotechnology
- 211104 Metallurgy
JKU Focus areas
- Engineering and Natural Sciences (in general)