Effect of anodization and annealing on corrosion and biocompatibility of NiTi alloy

Chembath, Manju; Balaraju, J.N.; Sujata, M

doi:10.1016/j.surfcoat.2016.06.031

Cited by 21 publications

(3 citation statements)

References 33 publications

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“…NiTi 8.4x is the only sample that shows an appreciable positive shift in the value of E corr and lowers the value of i corr in one order of magnitude compared with bare NiTi alloy. The i corr values obtained for the anodized samples are comparable with the values reported for NiTi anodized in different electrolytes ( Ref 11,25). In addition, the protection efficiency (PE) of the different samples was quantified using Eq 1:…”

Section: Corrosion Tests Of Anodically Polarized Samplessupporting

confidence: 79%

Low-Voltage Polarization in AOT Solution to Enhance the Corrosion Resistance of Nitinol

Saugo

Flamini

Saidman

2021

J. of Materi Eng and Perform

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In this work, the corrosion behavior of bare nitinol (NiTi) alloy in Ringer's solution containing different concentrations of sodium bis(2-ethylhexyl) sulfosuccinate (AOT) was first studied in order to determine whether the surfactant acts as a corrosion inhibitor. Results of potentiostatic and potentiodynamic experiments allowed concluding that AOT is a pitting corrosion inhibitor for NiTi. In a second stage of this research work, NiTi was treated under potentiostatic control (2.00 V) for 1 h in 0.10 M AOT solutions of pH 8.4 and 12. Static and rotating electrodes were used. The influence exerted by this treatment on the passive behavior of the alloy was studied in Ringer's solution using different electrochemical and surface analysis techniques. The best anticorrosion performance was obtained using a rotating electrode and AOT solution of pH 8.4. The thin oxide layer grown potentiostatically consists of TiO2, while no Ni was found in the outermost layer. The presence of this oxide layer allows reducing the amount of Ni and Ti released at open circuit potential conditions and at very positive potentials where pitting corrosion of the bare alloy occurs.

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Section: Corrosion Tests Of Anodically Polarized Samplessupporting

confidence: 79%

Low-Voltage Polarization in AOT Solution to Enhance the Corrosion Resistance of Nitinol

Saugo

Flamini

Saidman

2021

J. of Materi Eng and Perform

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“…Post-heat-treatment of the coatings is an effective way to improve anticorrosion behaviour [13][14][15][16][17][18]. This improvement is attributed to the decrease of OH functional group [19][20][21] and, consequently, formation of a hydrophobic compact surface [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Heat treatment of Hexa-Methylene Diamine Tetra-Methylene Phosphonic Acid (HMDTMPA) coating on biodegradable Mg to improve corrosion resistance and bioactivity

Soliman

Makhlouf

Wan

2021

Surface Engineering

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Since the bioactive surface needs hydrophilic coating; and the high corrosion resistance needs a hydrophobic one, it is a challenge to design a bioactive film that exhibits corrosion protection. In this article, Hexa-Methylene Diamine Tetra-Methylene Phosphonic Acid (HMDTMPA) film was deposited on Mg substrate at different heat treatment conditions. The heat-treated films at 150°C showed remarkable anticorrosion performance about five times the non-heated film. In addition, bioactivity character such as live cells attraction was noticed due to the increase of P-O groups that compensated the decrease of O-H groups in the film structure. Through the post-heat treatment, we were able to provide a new insight towards understanding how particular functional groups (OH) can modify the organic coating quality. The master key here is the formation of a stable film of chloroapatite that plays dual functions to inhibit the corrosive ions penetration and improve the bioactivity to attract the living-cell.

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“…Heat treatment is one of the most widely used methods resulting in the presence of TiO 2 layer on the surface. It was reported that the corrosion stability of NiTi alloys is strongly dependent on the oxide layer [28]. The oxide layer provides improved corrosion resistance and inhibits the risk of Ni release from the surface by acting as a physical and chemical barrier.…”

Section: Introductionmentioning

confidence: 99%

Influence of Heat Treatment Parameters on the Functional Behavior and Corrosion Performance of a Shape Memory Wire Actuator

Simsek

Yapıcı

2020

MSF

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In the present study, the effect of heat treatment parameters on the functional response, corrosion behavior and microstructural evolution of NiTi shape memory alloys were investigated. Various heat treatment regimes were utilized to study the impact of temperature and duration on the actuation behavior of wire samples under bending. Results clarified that austenite transformation temperatures As and Af increased at higher treatment temperatures. Cyclic response in the range of 0 to 15 degrees indicated that the actuation force exhibits an inverse relation with the treatment temperature. Higher treatment durations below 500°C elevated both the hardness and the sustained load. Bending force levels above 1500gf were achieved after a 90 min treatment at 400°C, whereas that over 500°C brought about a noticeable drop in strength. Investigations on the corrosion behavior of NiTi alloy was utilized in the simulated body fluid revealing that the sample heat treated at 400°C for 90 min showed the highest corrosion resistance.

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Effect of anodization and annealing on corrosion and biocompatibility of NiTi alloy

Cited by 21 publications

References 33 publications

Low-Voltage Polarization in AOT Solution to Enhance the Corrosion Resistance of Nitinol

Low-Voltage Polarization in AOT Solution to Enhance the Corrosion Resistance of Nitinol

Heat treatment of Hexa-Methylene Diamine Tetra-Methylene Phosphonic Acid (HMDTMPA) coating on biodegradable Mg to improve corrosion resistance and bioactivity

Influence of Heat Treatment Parameters on the Functional Behavior and Corrosion Performance of a Shape Memory Wire Actuator

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