The influence of porosity on corrosion characteristics of porous NiTi alloy in simulated body fluid

Nickel ion release from NiTi shape memory alloy is an issue for biomedical applications. This study was planned to study the effect of C[Formula: see text] implantation on nickel ion release and affinity of calcium phosphate precipitation on NiTi alloy. Four annealed samples are chosen for the present study; three samples with oxidation layer and the fourth without oxidation layer. X-ray diffraction (XRD) spectra reveal amorphization with ion implantation. Proton-induced X-ray emission (PIXE) result shows insignificant increase in Ni release in simulated body fluid (SBF) and calcium phosphate precipitation up to [Formula: see text][Formula: see text]ions/cm2. Then Nickel contents show a sharp increase for greater ion doses. Corrosion potential decreases by increasing the dose but all the samples passivate after the same interval of time and at the same level of [Formula: see text] in ringer lactate solution. Hardness of samples initially increases at greater rate (up to [Formula: see text][Formula: see text]ions/cm[Formula: see text] and then increases with lesser rate. It is found that [Formula: see text][Formula: see text]ions/cm2 ([Formula: see text] is a safer limit of implantation on NiTi alloy, this limit gives us lesser ion release, better hardness and reasonable hydroxyapatite incubation affinity.

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Effect of Three Different Electrolyte Additives on Corrosion Resistance of Micro-arc Oxidation Coating of NiTi Alloy in Simulated Body Fluid

International Journal of Electrochemical Science ◽

10.20964/2020.12.13 ◽

2020 ◽

pp. 11845-11855

Author(s):

Yao Yao ◽

Keyword(s):

Corrosion Resistance ◽

Simulated Body Fluid ◽

Body Fluid ◽

Niti Alloy ◽

Electrolyte Additives ◽

Micro Arc Oxidation

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Tribocorrosion behavior of NiTi alloy as orthopedic implants in Ringer’s simulated body fluid

Biomedical Physics & Engineering Express ◽

10.1088/2057-1976/ab1db0 ◽

2019 ◽

Vol 5 (4) ◽

pp. 045002

Author(s):

Yan Xue ◽

Yi Hu ◽

Zhenguo Wang

Keyword(s):

Simulated Body Fluid ◽

Body Fluid ◽

Niti Alloy ◽

Orthopedic Implants

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EIS study of porous NiTi biomedical alloy in simulated body fluid

Materials and Corrosion ◽

10.1002/maco.200905212 ◽

2009 ◽

Vol 60 (11) ◽

pp. 871-875 ◽

Cited By ~ 10

Author(s):

M. Attarchi ◽

M. Mazloumi ◽

I. Behckam ◽

S. K. Sadrnezhaad

Keyword(s):

Simulated Body Fluid ◽

Body Fluid ◽

Porous Niti ◽

Biomedical Alloy

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Application of EIS to Study the Corrosion Resistance of Passivated NiTi Shape Memory Alloy in Simulated Body Fluid

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.183.57 ◽

2011 ◽

Vol 183 ◽

pp. 57-64 ◽

Cited By ~ 14

Author(s):

Marlena Freitag ◽

B. Łosiewicz ◽

Tomasz Goryczka ◽

Józef Lelątko

Keyword(s):

Corrosion Resistance ◽

Shape Memory Alloy ◽

Simulated Body Fluid ◽

Shape Memory ◽

Pitting Corrosion ◽

Body Fluid ◽

Niti Alloy ◽

Amorphous State ◽

Open Circuit ◽

Niti Shape Memory Alloy

The NiTi shape memory alloy passivated for 90 min by autoclaving has been studied towards corrosion performance in the Tyrode’s simulated body fluid using open circuit potential and EIS measurements. The surface morphology and thickness of the oxide layer was determined by XRR. The HREM was used to observe the cross-section of the thin foil and to confirm the amorphous state of the TiO2 layer and its thickness. Electrochemical measurements revealed a good corrosion resistance at the beginning of long-term (20 days) immersion. It was found that with the increase of immersion time, the corrosion resistance of the surface deteriorated after nearly 1 day of immersion due to occurence of pitting corrosion. The EIS method was used to detailed study on the electrolyte | passive layer interfacial properties. Equivalent electrical circuit for the pitting corrosion on the passivated NiTi alloy has been applied.

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Rapid Biomimetic Deposition of Drug-Loaded Apatite Coatings

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.712-715.439 ◽

2013 ◽

Vol 712-715 ◽

pp. 439-442 ◽

Cited By ~ 1

Author(s):

Lei Bao ◽

Jing Xiao Liu ◽

Fei Shi ◽

Lian Peng Zhang ◽

Yan Yan Jiang ◽

...

Keyword(s):

Simulated Body Fluid ◽

Body Fluid ◽

Slow Release ◽

Niti Alloy ◽

Composite Coatings ◽

Synthesis Method ◽

Biomimetic Synthesis ◽

X Ray Diffraction ◽

Carbon Dioxide Gas ◽

Flake Structure

In order to reduce the postoperative inflammation by the slow release of drugs at the beginning of implanting, drug-loaded apatite coatings and chitosan-apatite composite coatings on the NiTi alloy surface were prepared in the Simulated Body Fluid concentrated by five (5×SBF) under constant bubbling of carbon dioxide gas by biomimetic synthesis method. The composition and surface morphology of the coatings were studied using scanning electron microscopy (SEM) and X-ray diffraction (XRD). Additionally, a bacterial inhibition test was conducted for evaluating the drug slow release effects from the drug-loaded coatings. The results indicated that the porous apatite coatings with the flake structure could be deposited using the 5 times Simulated Body Fluid, and the drug-loaded chitosan-apatite composite coatings with better drug slow release effect were obtained. The incorporation of chitosan into the coatings could effectively control the drug release rate and was favorable for achieving better drug slow release effects.

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Study on Surface Oxidation Behavior of Pourous NiTi Alloy at High Temperature

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.299-300.534 ◽

2011 ◽

Vol 299-300 ◽

pp. 534-537

Author(s):

Qiang Li ◽

Xiao Na Zhang

Keyword(s):

High Temperature ◽

Body Fluid ◽

Niti Alloy ◽

Surface Oxidation ◽

Powder Metallurgy Method ◽

Ion Release ◽

Oxidation Layer ◽

Porous Niti ◽

Before And After

In this paper, porous NiTi alloy prepared by powder metallurgy method was oxidized at high temperature. The effect of oxidation temperature and time on quality of oxidation layer of porous NiTi was studied. The component and morphology of oxidation layer before and after oxidation at high temperature were analyzed by XPS and SEM. The behavior of Ni ion release of porous NiTi alloy was observed. The results showed uniform and thick oxidation layer was formed on the surface of porous NiTi alloy after oxidation at 550°C for 1h. XPS analysis showed the oxidation layer mainly composed of TiO2, and the thickness of the film was about 180nm higher than that before oxidation. The research on the behavior of Ni ion release showed the Ni release after oxidation can be significantly reduced at simulated body fluid due to TiO2layer.

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