The Electrochemical Behavior of the NiTi Alloy in Different Simulated Body Fluids

Hansen, Alana Witt; Führ, Luciane Taís; Antonini, Leonardo Marasca; Villarinho, Denis Jardim; Marino, Cláudia Eliana Bruno; Malfatti, Célia de Fraga

doi:10.1590/1516-1439.305614

Cited by 30 publications

(17 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar to the conclusion of [40], it was observed that both the equiaxed (the equiaxed microstructure of Ti-1300 alloy presents mainly relatively large equiaxed β-grains)/lamellar (the lamellar microstructure for Ti-1300 alloy is dominated by large quantities of precipitates as α phase and retained β phase) microstructures undergo a preferential corrosion degradation of α phase and the α + β interphase boundaries which create localized micro galvanic series between α and β phases (Figure 4a In a study by Lu et al [45], the effect of α and β precipitations on the corrosion behaviour of β-type Ti-5Al-3Zr-4Mo-4Cr-4V alloy (Ti-1300) was investigated. Similar to the conclusion of [40], it was observed that both the equiaxed (the equiaxed microstructure of Ti-1300 alloy presents mainly relatively large equiaxed β-grains)/lamellar (the lamellar microstructure for Ti-1300 alloy is dominated by large quantities of precipitates as α phase and retained β phase) microstructures undergo a preferential corrosion degradation of α phase and the α + β interphase boundaries which create localized micro galvanic series between α and β phases (Figure 4a Also, different simulated body fluids were used by Hasena et al [47] in order to evaluate the electrochemical behaviour of NiTi alloy. Figure 5 exhibits the OCP (open circuit potential) of all the tested solutions.…”

Section: In Vitro Electrochemical Corrosion Testing Proceduresmentioning

confidence: 99%

“…Also, a further reduction of pH decreases the corrosion resistance of the alloy in all the solutions (Table 1). Also, different simulated body fluids were used by Hasena et al [47] in order to evaluate the electrochemical behaviour of NiTi alloy. Figure 5 exhibits the OCP (open circuit potential) of all the tested solutions.…”

Section: In Vitro Electrochemical Corrosion Testing Proceduresmentioning

confidence: 99%

“…Open circuit potentials (OCP) in different simulated body fluids at 37 °C and in 0.9% NaCl at 25 °C[47].…”

mentioning

confidence: 99%

See 2 more Smart Citations

On the Corrosion Behaviour of Low Modulus Titanium Alloys for Medical Implant Applications: A Review

Afzali

Ghomashchi

Oskouei

2019

Metals

View full text Add to dashboard Cite

The corrosion behaviour of new generation titanium alloys (β-type with low modulus) for medical implant applications is of paramount importance due to their possible detrimental effects in the human body such as release of toxic metal ions and corrosion products. In spite of remarkable advances in improving the mechanical properties and reducing the elastic modulus, limited studies have been done on the electrochemical corrosion behaviour of various types of low modulus titanium alloys including the effect of different beta-stabilizer alloying elements. This development should aim for a good balance between mechanical properties, design features, metallurgical aspects and, importantly, corrosion resistance. In this article, we review several significant factors that can influence the corrosion resistance of new-generation titanium alloys such as fabrication process, body electrolyte properties, mechanical treatments, alloying composition, surface passive layer, and constituent phases. The essential factors and their critical features are discussed. The impact of various amounts of α and β phases in the microstructure, their interactions, and their dissolution rates on the surface passive layer and bulk corrosion behaviour are reviewed and discussed in detail. In addition, the importance of different corrosion types for various medical implant applications is addressed in order to specify the significance of every corrosion phenomenon in medical implants.

show abstract

Section: In Vitro Electrochemical Corrosion Testing Proceduresmentioning

confidence: 99%

Section: In Vitro Electrochemical Corrosion Testing Proceduresmentioning

confidence: 99%

See 1 more Smart Citation

On the Corrosion Behaviour of Low Modulus Titanium Alloys for Medical Implant Applications: A Review

Afzali

Ghomashchi

Oskouei

2019

Metals

View full text Add to dashboard Cite

show abstract

“…Correlation coefficients for calibration curves were above 0.999. The ionic concentrations (mmol/L) of the SBF used in the present study were determined by Hansen et al [34] …”

Section: Ni Ion Release (Immersion Test)mentioning

confidence: 99%

In Vitro Corrosion Assessment of Additively Manufactured Porous NiTi Structures for Bone Fixation Applications

Ibrahim

Jahadakbar

Dehghan

et al. 2018

Metals

View full text Add to dashboard Cite

NiTi alloys possess distinct functional properties (i.e., shape memory effect and superelasticity) and biocompatibility, making them appealing for bone fixation applications. Additive manufacturing offers an alternative method for fabricating NiTi parts, which are known to be very difficult to machine using conventional manufacturing methods. However, poor surface quality, and the presence of impurities and defects, are some of the major concerns associated with NiTi structures manufactured using additive manufacturing. The aim of this study is to assess the in vitro corrosion properties of additively manufactured NiTi structures. NiTi samples (bulk and porous) were produced using selective laser melting (SLM), and their electrochemical corrosion characteristics and Ni ion release levels were measured and compared with conventionally fabricated NiTi parts. The additively manufactured NiTi structures were found to have electrochemical corrosion characteristics similar to those found for the conventionally fabricated NiTi alloy samples. The highest Ni ion release level was found in the case of 50% porous structures, which can be attributed to their significantly higher exposed surface area. However, the Ni ion release levels reported in this work for all the fabricated structures remain within the range of most of values for conventionally fabricated NiTi alloys reported in the literature. The results of this study suggest that the proposed SLM fabrication process does not result in a significant deterioration in the corrosion resistance of NiTi parts, making them suitable for bone fixation applications.

show abstract

“…Potentiodynamic polarization curves were obtained starting from the open circuit potential and progressing in the anodic direction up to 2 V at a scan rate of 0.001 V•s -1 at a constant temperature of 37°C. The electrolyte used was the Hank's simulated physiologic solution (composition given in Table 1), chosen as it has been shown to yield highly reproducible results when used to assess the corrosion behavior of NiTi alloys 10 . After the electrochemical test, additional surface morphology assessment of the wires was performed using SEM.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Surface Characterization of NiTi Superelastic and Shape Memory Alloys After Electrolytic Polishing

et al. 2017

View full text Add to dashboard Cite

For the biomedical application of NiTi alloys, an excellent surface finishing process is required to guarantee high corrosion resistance and biocompatibility, eliminating the allergenic and toxic effects associated with the release of nickel ions in the body. Electropolishing is a process that can reduce surface imperfections and form a thin protective layer of TiO 2 , even in complex-shaped devices. The main objective of our study was to find and report suitable parameters for electrolytic polishing of NiTi wires, in both the superelastic and shape memory states. The results indicate that electropolishing in a 3.5 mol•L -1 methanolic H 2 SO 4 electrolyte at 20°C can effectively reduce surface roughness, remove superficial nickel-rich layers and improve corrosion resistance for austenitic and martensitic NiTi alloys.

show abstract

The Electrochemical Behavior of the NiTi Alloy in Different Simulated Body Fluids

Cited by 30 publications

References 35 publications

On the Corrosion Behaviour of Low Modulus Titanium Alloys for Medical Implant Applications: A Review

On the Corrosion Behaviour of Low Modulus Titanium Alloys for Medical Implant Applications: A Review

In Vitro Corrosion Assessment of Additively Manufactured Porous NiTi Structures for Bone Fixation Applications

Surface Characterization of NiTi Superelastic and Shape Memory Alloys After Electrolytic Polishing

Contact Info

Product

Resources

About