The electrochemical behavior of Ti‐6Al‐7Nb alloy with and without plasma‐sprayed hydroxyapatite coating in Hank's solution

Lavos-Valereto, I. C.; Costa, Isolda; Wolynec, Stephan

doi:10.1002/jbm.10351

Cited by 55 publications

(28 citation statements)

References 11 publications

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“…This result is also supported by the very low corrosion current density at the corrosion potential (order of nA/cm 2 ), showing that this does not compromise the corrosion performance of the Ti alloy under service conditions. On the other hand, thick and porous layers on implant materials have been related to good osteointegration ability [2,23,24].…”

Section: Discussionmentioning

confidence: 99%

The electrochemical behaviour of Ti‐13Nb‐13Zr alloy in various solutions

Assis

Wolynec

Costa

2008

Materials & Corrosion

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The electrochemical behaviour of a near-b Ti-13Nb-13Zr alloy for the application as implants was investigated in various solutions. The electrolytes used were 0.9 wt% NaCl solution, Hanks' solution and a culture medium known as minimum essential medium (MEM) composed of salts, vitamins and amino acids, all at 37 8C. The electrochemical behaviour was investigated by the following electrochemical techniques: open circuit potential measurements as a function of time, electrochemical impedance spectroscopy (EIS) and determination of polarisation curves. The obtained results showed that the Ti alloy was passive in all electrolytes. The EIS results were analysed using an equivalent electrical circuit representing a duplex structure oxide layer, composed of an inner barrier layer, mainly responsible for the alloy corrosion resistance, and an outer and porous layer that has been associated to osteointegration ability. The properties of both layers were dependent on the electrolyte used. The results suggested that the thickest porous layer is formed in the MEM solution whereas the impedance of the barrier layer formed in this solution was the lowest among the electrolytes used. The polarisation curves showed a current increase at potentials around 1300 mV versus saturated calomel electrode (SCE), and this increase was also dependent on the electrolyte used. The highest increase in current density was also associated to the MEM solution suggesting that this is the most aggressive electrolyte to the Ti alloy among the three tested solutions.

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Section: Discussionmentioning

confidence: 99%

The electrochemical behaviour of Ti‐13Nb‐13Zr alloy in various solutions

Assis

Wolynec

Costa

2008

Materials & Corrosion

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“…This phenomenon indicates the thickening of the passive oxide film. 25 There is no markedly fluctuation in the curves of pure Zr, pure Ti, and LM106 till the end of the experiment, but LM1 and LM1b show several peaks before the steady state is achieved. In addition, LM1b shows the highest OCP values compared with other alloys in both electrolytes.…”

Section: Corrosion Behaviormentioning

confidence: 91%

“…For example, Wataha et al 19 reported the cytotoxicity effects on three In this study, we attempt to address the question by using various electrochemical measurements to reveal the corrosion performance and ion release behaviors of the Zrbased BMGs; furthermore, we implemented, in vitro cytotoxicity evaluation by using two cell lines (L929 and NIH3T3) to evaluate their in vitro biocompatibility. 25 (in at %), also known as LM106, LM1, and LM1b, respectively, were fabricated by Liquidmetal Technologies (Lake Forest, CA). Briefly, the alloy ingots were prepared by arc melting method with high purity metals Zr (99.8 wt %), Ti (99.8 wt %), Nb (99.7 wt %), Cu (99.95%), Ni (99.98 wt %), Be (99.9 wt %), and Al (99.99 wt %) in an argon atmosphere, and then the ingots were inductively remelted in a crucible and cylindrical bulk amorphous samples of 5 mm diameter were obtained by injection casting into a copper mould.…”

Section: Introductionmentioning

confidence: 99%

In vitro study on Zr‐based bulk metallic glasses as potential biomaterials

et al. 2010

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With pure Ti and pure Zr as controls, the corrosion resistance, ion release behavior, and in vitro biocompatibility of Be-containing Zr₄₁Ti₁₄Cu₁₂Ni₁₀Be₂₃ bulk metallic glass (BMG) (LM1), Zr₄₄Ti₁₁Cu₁₀Ni₁₀Be₂₅ BMG (LM1b), and Be-free Zr₅₇Nb₅Cu₁₅.₄Ni₁₂.₆Al₁₀ BMG (LM106) were investigated in terms of electrochemical measurements in simulated body fluid (SBF) with pH value 7.4 and artificial saliva (AS) with pH value 6.3, and 3-[4,4-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide (MTT) assay using L929 and NIH3T3 cells, aiming to assess the feasibility of Zr-based BMGs as potential biomaterial. It was found that LM1b showed superior corrosion resistance to LM106 and LM1 in both SBF and AS, and comparable with pure Ti and pure Zr. After 7200 s immersion, a two-layer structure oxide film was formed on LM1, LM1b, and pure Zr surfaces, while one-layer structure oxide film was formed on LM106 and pure Ti surfaces. The pitting corrosion potentials of LM1b were much higher than that of LM1, LM106, and pure Zr, resulting in very few ions releasing into the electrolytes. No Be ion could be detected but a little amount of Cu ion was detected for LM106, LM1, and LM1b after immersion in Dulbecco's modified Eagle's medium for 72 h at 37 °C. The indirect cytotoxicity results show that LM106, LM1, and LM1b extracts had no cytotoxicity to L929 and NIH3T3 cells. The direct cytotoxicity results show that cells could adhere well on the Zr-based BMG surface as in pure Ti and Zr. Lower cell proliferation rate of LM106 and LM1 is observed when compared with LM1b, which was found to be caused by Cu ion releasing rather than by Be ion.

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“…The corrosion potential in these curves is defined by the intersection of the activation polarization anodic curve related to the formation of the passive film with the activation cathodic curve of oxygen reduction. This intersection takes place at potentials lower than where there is already a well-formed passive film on the surface [9]. Corrosion current density, to which the corrosion rate is normally proportional, is an important parameter for evaluating the kinetics of corrosion reactions.…”

Section: Potentiodynamic Polarization Testsmentioning

confidence: 99%

Corrosion behavior of TiN and TiN/Ti composite films on Ti6Al4V alloy in Hank’s solution

2008

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Surface films of TiN and TiN/Ti were deposited on Ti6Al4V alloy by arc ion plating (AIP). Opencircuit potential, potentiodynamic polarization tests and electrochemical impedance spectroscopy (EIS) were employed to investigate the corrosion performance of TiN and TiN/Ti films in Hank's simulated body fluid at 37°C and pH 7.4. Scanning electron microscopy (SEM) was used to study the surface morphology of the corroded samples after the potentiodynamic polarization tests. The results show that the TiN and the TiN/Ti films can provide effective protection for the Ti6Al4V substrate in Hank's fluid, and the TiN/Ti composite film showed a corrosion resistance superior to that of the TiN film. The outer TiN layer of the composite film mainly acted as an efficient barrier to corrosion during short-term experiments. In contrast to the bare Ti6Al4V, no pitting was observed on the surface of the TiN and TiN/Ti films deposited on the bare alloy after potentiodynamic polarization.

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The electrochemical behavior of Ti‐6Al‐7Nb alloy with and without plasma‐sprayed hydroxyapatite coating in Hank's solution

Cited by 55 publications

References 11 publications

The electrochemical behaviour of Ti‐13Nb‐13Zr alloy in various solutions

The electrochemical behaviour of Ti‐13Nb‐13Zr alloy in various solutions

In vitro study on Zr‐based bulk metallic glasses as potential biomaterials

Corrosion behavior of TiN and TiN/Ti composite films on Ti6Al4V alloy in Hank’s solution

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