6533b839fe1ef96bd12a6e84
RESEARCH PRODUCT
Anodic oxide films on tungsten—II. The morphology and dissolution of the films
A. Di PaolaCarmelo SunseriF. Di Quartosubject
Materials scienceAnodizingScanning electron microscopeGeneral Chemical EngineeringMetallurgychemistry.chemical_elementGeneral ChemistryTungstenCorrosionChemical engineeringchemistryGravimetric analysisGeneral Materials SciencePorosityCurrent densityDissolutiondescription
Abstract Scanning electron microscopy was used to investigate the morphology of anodic oxide films on tungsten, obtained in various conditions of anodization. Studies were made of the growth of porous films, whose thickness increases with time and depends upon the current density. Temperature and electrolyte composition influence the film morphology. Gravimetric measurements of film dissolution at 70°C show that after a transient time, the rate of metal dissolution and that of film formation coincide. The porous films thicken because tungsten dissolves as WO 2 2+ and precipitates as WO 3 .H 2 O.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1980-01-01 | Corrosion Science |