Corrosion behaviour of tantalum in sodium hydroxide solutions

Robin, A.
January 2003
Journal of Applied Electrochemistry;Jan2003, Vol. 33 Issue 1, p37
Academic Journal
The corrosion behaviour of tantalum has been investigated in sodium hydroxide solutions at different temperatures, using open-circuit potential measurements, potentiodynamic polarization, polarization resistance method and electrochemical impedance spectroscopy. Tantalum showed a passive behaviour in 5 and 10 wt % NaOH at 25, 50 and 75 °C, and in 15 wt % NaOH at 25 and 50 °C. in 15 wt % NaOH at 75 °C and in 30 wt % NaOH at all temperatures, tantalum presented a passive-active transition (self-activation) due to the spontaneous dissolution of its superficial air-formed oxide, and afterwards remained in the active state for long times, forming a polytantalate compound. in all cases, the corrosion rates increase with increasing NaOH concentration and temperature.


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