Corrosion behavior of Ti‐xNb‐13Zr alloys in Ringer's solution

Abstract

Ti-6Al-4V alloy has been widely used in restorative surgery due to its high corrosion resistance and biocompatibility. Nevertheless, some studies showed that V and Al release in the organism might induce cytotoxic effects and neurological disorders, which led to the development of V-free alloys and both V-and Al-free alloys containing Nb, Zr, Ta, or Mo. Among these alloys, Ti-13Nb-13Zr alloy is promising due to its better biomechanical compatibility than Ti-6Al-4V. In this work, the corrosion behavior of Ti, Ti-6Al-4V, and Ti-xNb-13Zr alloys (x ¼ 5, 13, and 20) was evaluated in Ringer's solution (pH 7.5) at 37 8C through open-circuit potential measurements, potentiodynamic polarization, and electrochemical impedance spectroscopy. Spontaneous passivity was observed for all materials in this medium. Low corrosion current densities (in the order of 10 À7 A/cm 2 ) and high impedance values (in the order of 10 5 Vcm 2 at low frequencies) indicated their high corrosion resistance. EIS results showed that the passivating films were constituted of an outer porous layer (very low resistance) and an inner compact layer (high resistance), the latter providing the corrosion resistance of the materials. There was evidence that the Ti-xNb-13Zr alloys were more corrosion resistant than both Ti and Ti-6Al-4V in Ringer's solution.

Influence of fluoride on the electrochemical behvior of a new synthesized Ti-10Ta-2Mo alloy for biomedical applications

“…The same profils are observed in different physiological medias containing fluoride ion at neutral pH solution [10,16]. The presence of fluoride ions in a solution containing 10000…”

“…Their highly chemical stability is due to formation of a very resistant and protective oxide layer on their surface [1][2][3]. The phenomenon of passivation is a 0.9%NaCl [4][5][6][7], Ringer's solution [8][9][10], Hank's solution [11,12], Phosphate buffered saline solution PBS [13,14] and other simulated physiological media.…”

Effect of Alloying Elements on Plastic Workability and Corrosion Behavior of Ti-X (X = 6 Co, 8 Cr, 4 Fe, 6 Mn, 10 Mo, and 36 Nb) Binary Alloys

“…A/cm 2 , which are lower than the reported corrosion current densities of titanium alloys (of the order of 10 -7 A/cm 2 ) [16].…”

Electrochemical synthesis of oxide nanotubes on Ti6Al7Nb alloy and their interaction with the simulated body fluid

“…All samples showed spontaneous passivity with passive current densities lower than pure Ti. Looking for vanadium-free alloys, Robin et al investigated corrosion behavior of a series of Ti13Nb13Zr alloys with variable Nb content in Ringer solution [8]. Comparing the results of electrochemical studies with those obtained for Ti and Ti6Al4V alloys, they found that the resistance of a passivating film is higher for Ti13Nb13Zr alloy, which indicates higher corrosion resistance.…”