Passivation behavior of titanium-6Al-4V alloy in phosphoric acid solution
Titanium metal has light weight, good mechanical properties, and excellent corrosion resistance. It has, therefore, been considered for various applications in the process industries. The corrosion resistance of the metal is related to its inherent nature to form stable titanium dioxide. However, the oxide film on the metal is thermodynamically unstable in nonoxidizing acidic aqueous environments. These characteristics limit the more widespread use of the metal in many nonoxidizing acids. The stability of the metal in such environments can be restored by the adjustment of potential by the use of anodic passivation or by introducing a redox system. The present study is concerned with the passivitation tendencies of the titanium alloy Ti-6Al-4V, in different concentrations of phosphoric acid at different temperatures. It is found that the passive film on titanium-6Al-4V alloy in different concentrations of phosphoric acid is stable over a wide range of potentials with a low passive dissolution current density. 15 references.
- Research Organization:
- National Metallurgical Lab., Jamshedpur, India
- OSTI ID:
- 5493792
- Journal Information:
- J. Electrochem. Soc.; (United States), Journal Name: J. Electrochem. Soc.; (United States) Vol. 132; ISSN JESOA
- Country of Publication:
- United States
- Language:
- English
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