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aluminum vanadium alloy (Ti6Al4V) is a high strength titanium alloy containing 4% vanadium that has been widely used for parts in gas turbines and airframes of aircraft. It has a very low density and high strength and it can be heat treated to maintain these properties for long periods at temperatures of up to 545degC.
This alloy has been used for blades, discs and casings in gas turbines and for parts of airframes where they have been applied to reduce weight and increase fuel efficiency. New grades of the alloy with 8% and 15% vanadium have also been developed for applications in aerospace where they can be used for lightweight support structures.
Vanadium is a vital metal component of a wide range of materials and has numerous applications. Its strong and corrosion resistant properties are essential for many applications in the aerospace sector and it is particularly important in materials selected for aero-engine gas turbines where its ability to maintain high strengths at high operating temperatures is required.
Recent advances in the development of fusion nuclear systems have led to the study of vanadium and its alloys for applications in MCF based reactors. Among the most promising is vanadium alloys containing a small percentage of chromium and tungsten that can be exposed to a high oxygen pressure without compromising their mechanical properties.
Using a controlled anodic overpotential at 200 degC and a cyclic voltammogram of the vanadium working electrode in a chloride melt we were able to record the ongoing electrochemical reactions related to the vanadium and aluminium ions. In the case of vanadium ions we recorded polarization curves that scanned from EI potentials negative to the aluminium equilibrium potential to potentials close to the anodic and cathodic endpoints of the dissolution process. From this polarization curve we could identify the current waves reflected by the cyclic voltammograms. Those current waves are the reflection of vanadium dissolution (V(0) – V(II)), and further oxidation reactions, (V(II) – V(III) and V(IV) – V(III)).