Abstract
Titanium exhibits high corrosion resistance in biological environments. The main objective of
its alloying with beta-stabilizing elements is to decrease modulus of elasticity. It is important to preserve corrosion resistance. The presented study was aimed at corrosion properties of Ti15Ta and Ti30Ta alloys in comparison with titanium. Measurements were performed on titanium, both alloys and tantalum in the physiological without or with fluoride ions. Electrochemical study was based on electrochemical impedance spectroscopy. Corrosion behavior of the studied alloys was significantly influenced by titanium. In the physiological solution, both alloys displayed stable passivity. Titanium is highly sensitive to the presence of fluoride ions. Its alloying with tantalum had a positive effect under the given conditions, which applied particularly to the Ti30Ta alloy. Titanium-tantalum binary alloys are not considered for direct use, yet the knowledge of their behavior may contribute to a more rational design of alloy systems applicable in dental practice.

Key words
Ti-Ta alloys, corrosion, fluoride ions, surface analysis, impedance spectroscopy

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