Electrochemical and SEM studies of a new implant bioalloy in physiological electrolytes

Popa, Mónica; Vasilescu, Ecaterina; Drob, Paula; Mareci, Daniel; Moreno, José María Calderón; Ivanescu, Steliana; Vasilescu, Cora; Rosca, Julia Claudia Mirza

doi:10.1002/maco.200905382

Cited by 22 publications

(18 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…29,[32][33][34] Also, all E oc values of ternary Ti-6Al-4V alloy have more electronegative values than of quaternary Ti-6Al-4V-1Zr alloy, pointing out a more stable passive state for the new alloy, due to the passive ZrO 2 oxide 10,22 that is presented in the passive layer.…”

Section: Improvement Of Corrosion Resistance From In Time Variations mentioning

confidence: 92%

Corrosion resistance improvement of titanium base alloys

Popa¹,

Vasilescu²,

Drob³

et al. 2010

Quím. Nova

View full text Add to dashboard Cite

Recebido em 4/2/10; aceito em 2/6/10; publicado na web em 24/8/10The corrosion resistance of the new Ti-6Al-4V-1Zr alloy in comparison with ternary Ti-6Al-4V alloy in Ringer-Brown solution and artificial Carter-Brugirard saliva of different pH values was studied. In Ringer-Brown solution, the new alloy presented an improvement of all electrochemical parameters due to the alloying with Zr; also, impedance spectra revealed better protective properties of its passive layer. In Carter-Brugirard artificial saliva, an increase of the passive film thickness was proved. Fluoride ions had a slight negative influence on the corrosion and ion release rates, without to affect the very good stability of the new Ti-6Al-4V-1Zr alloy.

show abstract

Section: Improvement Of Corrosion Resistance From In Time Variations mentioning

confidence: 92%

Corrosion resistance improvement of titanium base alloys

Popa¹,

Vasilescu²,

Drob³

et al. 2010

Quím. Nova

View full text Add to dashboard Cite

show abstract

“…From Table 3 can be observed that, in 0.1 M Na 2 SO 4 solution, the new Ti-6Al-2Nb-1Ta alloy presented very low values of the corrosion current densities and rates, placed in the 'perfectly stable' class. Polarisation resistances increased in time showing higher resistances of the passive film and better protective capacities [24][25][26].…”

Section: Corrosion Resistance Resulting From Tafel Diagramsmentioning

confidence: 99%

“…Therefore, the alloy is in the passive state with a (Table 1). Also, the differences jE corr ÀE p j had very low values, showing a very good and very easy tendency to passivation (Table 1) in 0.1 M Na 2 SO 4 solution [24][25][26]. The corrosion potentials shifted to electropositive direction with increasing time.…”

Section: Corrosion Behaviour In 01 M Na 2 So 4 Solutionmentioning

confidence: 99%

Corrosion behaviour of a new Ti‐6Al‐2Nb‐1Ta alloy in various solutions

Pîrvu

Demetrescu

Drob

et al. 2011

Materials & Corrosion

Self Cite

View full text Add to dashboard Cite

A new Ti-6Al-2Nb-1Ta alloy was obtained for to satisfy the mechanical and anticorrosion requirements in neutral corrosive environment. The corrosion behaviour of this new Ti-6Al-2Nb-1Ta alloy in 0.1 M Na 2 SO 4 , 3% NaCl solutions and synthetic sea water was studied in this paper, using potentiodynamic and linear polarisation method, electrochemical impedance spectroscopy (EIS) and monitoring of the open circuit potentials. The structure of the alloy represents an a þ b uniform structure with un-oriented grains. From the potentiodynamic polarisation curves it resulted that the studied alloy is self-passivated in all three solutions having a very good and very easy tendency to passivation. The most favourable values of the electrochemical parameters were registered in 0.1 M Na 2 SO 4 solution due to its reduced corrosivity. EIS measurements proved the improvement of the passive layer resistance with the immersion time. An electric equivalent circuit with two time constants was fitted. The values of the polarisation resistances showed very good protective capacities which improved in time. The open circuit potentials have the general tendency to ennoble in time, suggesting the thickening of the passive films and the increase of their protective capacities.

show abstract

“…3) showed a selfpassivation behaviour without active-passive transition potential range but with very large passive potential range, DE p (more 4000 mV, maximum potential limit in our experiments), that represents a very stable protective film [10,[38][39][40]. Corrosion potentials, E corr (Table 1) shifted to more electropositive values for anodised alloy, due to the formation of the thicker, more stable nanolayer on the surface during the anodisation process; also, the increase of E corr suggests that the electrodeposited film acts as a barrier against the corrosion attack [38][39][40]. Passive current densities, i p remained almost constantly on the whole passive potential range, consequently, the existing film progressively thickened; anodised alloy had lower i p values as result of the existence of the anodised nanolayer that moreover strengthened and thickened the native passive film, conferring it higher resistance, and protection [26].…”

Section: Electrochemical Stability Of Anodised Alloymentioning

confidence: 99%

“…4) revealed large arcs, capacitive loops with bigger diameters for anodised alloy that implies higher resistances compared with those of the bare alloy. The impedance values are higher for the anodised alloy proving that the anodised film increased the insulating, protective properties of the alloy native passive film [17,26,[38][39][40][41][42][43].…”

Section: Electrochemical Stability Of Anodised Alloymentioning

confidence: 99%

Surface characterisation and electrochemical stability of anodised new alloy in simulated physiological electrolytes

Vasilescu

Moreno

Drob

et al. 2013

Materials and Corrosion

Self Cite

View full text Add to dashboard Cite

In this paper, we applied the potentiostatic anodisation method on the new Ti-20Nb-10Zr-5Ta alloy surface with the aim to increase its stability and bioactivity. The morphology (SEM) and composition (Raman, FT-IR) of the obtained anodisation nanolayer are studied. Also, electrochemical stability (by cyclic potentiodynamic polarisation and EIS), corrosion resistance (by linear polarisation), long-term behaviour (by monitoring of the open circuit potentials and corresponding open circuit potential gradients) and the characterisation of the layers deposited on the alloy surface after 1000 h in acid, neutral and alkaline Ringer and neutral Ringer-Brown solutions are presented. By potentiostatic anodisation, on the alloy surface was electrodeposited a continuous nanolayer containing TiO 2 rutile type oxide. The anodised layer possesses better protective properties and at the same time better porosity, therefore a higher stability and bioactivity in comparison with the native passive film. After 1000 h in the testing solutions promoted the deposition of the brushite, phosphatotitanate and hydroxyapatite, precursors, respectively component of the human bone, namely this layer is bioactive.

show abstract

Electrochemical and SEM studies of a new implant bioalloy in physiological electrolytes

Cited by 22 publications

References 48 publications

Corrosion resistance improvement of titanium base alloys

Corrosion resistance improvement of titanium base alloys

Corrosion behaviour of a new Ti‐6Al‐2Nb‐1Ta alloy in various solutions

Surface characterisation and electrochemical stability of anodised new alloy in simulated physiological electrolytes

Contact Info

Product

Resources

About