Abstract
Molybdenum oxide-based conversion coatings have been formed on the surface of the depleted uranium-0.75 wt% titanium alloy using either concentrated nitric acid or fluorides for surface activation prior to coating formation. The acid-activated surface forms a coating that offers corrosion protection after a period of aging, when uranium species have migrated to the surface. X-ray photoelectron spectroscopy (XPS) revealed that the protective coating is primarily a polymolybdate bound to a uranyl ion. Rutherford backscattering spectroscopy (RBS) on the acid-activated coatings also shows uranium dioxide migrating to the surface. The fluoride-activated surface does not form a protective coating and there are no uranium species on the surface as indicated by XPS. The coating on the fluoride-activated samples has been found to contain a mixture of molybdenum oxides of which the main component is molybdenum trioxide and a minor component of an Mo(V) oxide.
| Original language | English |
|---|---|
| Pages (from-to) | 3895-3903 |
| Number of pages | 9 |
| Journal | Electrochimica Acta |
| Volume | 51 |
| Issue number | 19 |
| DOIs | |
| State | Published - May 20 2006 |
Keywords
- Corrosion
- Molybdate coatings
- RBS
- Uranium alloys
- XPS
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