EIS Study on Interfacial Properties of Passivated Nitinol Orthodontic Wire in Saliva Modified with Eludril® Mouthwash

Osak, Patrycja; Łosiewicz, B.

doi:10.1134/s2070205118040226

Cited by 10 publications

(31 citation statements)

References 27 publications

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“…The measured high values of |Z|f→0 and  close to −90° confirm the capacitive behavior of the material that was characterized by high corrosion resistance. The obtained impedance values are in good compliance with the experimental impedance that was determined for passivated metallic materials in solutions containing aggressive Cl − ions, which cause pitting corrosion [46][47][48]. One can also observe an Figure 11 for the NiTi alloy before and after surface modification in Ringer's solution.…”

Section: In Vitro Corrosion Resistance Testssupporting

confidence: 84%

“…The electrode potential was stabilized until a constant E OC value was obtained due to the fact that the EIS method is only applicable to electrochemical systems that behave linearly and are in steady-state. For approximation of experimental impedance data that were obtained in the case of S1 and S2 electrodes, the simplest electrical equivalent circuit in the form of the Randles circuit was used [46][47][48]. A solution resistance (R s ) in series with a parallel connection of a double layer capacitance (C dl ) and a charge transfer resistance (R ct ) was used to model the AC impedance data.…”

Section: In Vitro Corrosion Resistance Testsmentioning

confidence: 99%

“…It produces one semicircle on the complex plane plot (R s , CPE-T 1 , CPE-φ 1 , R ct1 ). Such a model is well-known in the testing of corrosion resistance of NiTi alloy in a simulated human body solution [46][47][48].…”

Section: In Vitro Corrosion Resistance Testsmentioning

confidence: 99%

“…The Okamoto model describes the phenomenon of pitting initiation and propagation. It was discussed in our earlier work [48]. It is assumed that the water molecules on the metal surface are replaced with chloride ions.…”

Section: S1mentioning

confidence: 99%

“…According to the latest trends in implantology, this is achieved by covering the biomaterial surface with coatings having a chemical composition similar to that of the surrounding tissues. Bioactive coatings support the regeneration process by stimulating the reconstruction of tissues that surround the implant; they can be a source of tissue-forming elements and a carrier of medicinal substances, but, above all, they must meet the strict requirements for corrosion resistance in a biological environment [46][47][48].…”

Section: Introductionmentioning

confidence: 99%

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Functionalization of the NiTi Shape Memory Alloy Surface by HAp/SiO2/Ag Hybrid Coatings Formed on SiO2-TiO2 Glass Interlayer

2020

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The surface modification of NiTi shape memory alloys is a method for increasing their multi-functionalities. In our solution, hydroxyapatite powder was mixed with a chemically synthesized silicon dioxide/silver (nSiO2/Ag) nanocomposite in a different weight ratio between components (1:1, 5:1, and 10:1) and then electrophoretically deposited on the surface of the NiTi alloy, under various time and voltage conditions. Subsequently, uniform layers were subjected to heat treatment at 700 °C for 2 h in an argon atmosphere to improve the strength of their adhesion to the NiTi substrate. A change in linear dimensions of the co-deposited materials during the sintering process was also analyzed. After the heat treatment, XRD, Raman, and Scanning Electron Microscopy (SEM) + Energy Dispersive Spectrometer (EDS) studies revealed the formation of completely new composite coatings, which consisted of rutile and TiO2-SiO2 glass with silver oxide and HAp particles that were embedded into such coatings. It was found that spalling characterized the 1:1 ratio coating, while the others were crack-free, well-adhered, and capable of deformation to 3.5%. Coatings with a higher concentration of nanocomposite were rougher. Electrochemical impedance spectroscopy (EIS) tests in Ringer’s solution revealed the capacitive behavior of the material with high corrosion resistance. The kinetics and susceptibility to pitting corrosion was the highest for the NiTi electrode that was coated with a 5:1 ratio HAp/nSiO2/Ag hybrid coating.

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Section: In Vitro Corrosion Resistance Testssupporting

confidence: 84%

Section: In Vitro Corrosion Resistance Testsmentioning

confidence: 99%

Section: In Vitro Corrosion Resistance Testsmentioning

confidence: 99%

Section: S1mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Functionalization of the NiTi Shape Memory Alloy Surface by HAp/SiO2/Ag Hybrid Coatings Formed on SiO2-TiO2 Glass Interlayer

2020

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Structure, biocompatibility and corrosion resistance of the ceramic-metal surface of porous nitinol

Марченко

Baigonakova²,

Yasenchuk³

et al. 2022

Ceramics International

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Mechanical Properties, Corrosion Resistance and Bioactivity of Oxide Layers Formed by Isothermal Oxidation of Ti-6Al-7Nb Alloy

et al. 2021

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Titanium and its alloys are among the most promising biomaterials for medical applications. In this work, the isothermal oxidation of Ti-6Al-7Nb biomedical alloy towards improving its mechanical properties, corrosion resistance, and bioactivity has been developed. The oxide layers were formed at 600, 700, and 800 °C for 72 h. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), 3D profilometry, and microindentation test, were used to characterize microstructure, surface geometrical structure, and the hardness of the diphase (α + β) Ti-6Al-7Nb alloy after oxidation, respectively. In vitro corrosion resistance tests were carried out in a saline solution at 37 °C using the open-circuit potential method and potentiodynamic measurements. Electronic properties in the air were studied using the Scanning Kelvin Probe (SKP) technique. The bioactivity test was conducted by soaking the alkali- and heat-treated samples in simulated body fluid for 7 days. The presence of apatite was confirmed using SEM/EDS and Fourier Transform Infrared Spectroscopy (FTIR) studies. The thickness of oxide layers formed increased with the temperature growth from 0.25 to 5.48 µm. It was found that with increasing isothermal oxidation temperature, the surface roughness, hardness, corrosion resistance, and contact potential difference increased. The Ti-6Al-7Nb alloy after oxidation revealed the HAp-forming ability in a biological environment.

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EIS Study on Interfacial Properties of Passivated Nitinol Orthodontic Wire in Saliva Modified with Eludril® Mouthwash

Cited by 10 publications

References 27 publications

Functionalization of the NiTi Shape Memory Alloy Surface by HAp/SiO2/Ag Hybrid Coatings Formed on SiO2-TiO2 Glass Interlayer

Functionalization of the NiTi Shape Memory Alloy Surface by HAp/SiO2/Ag Hybrid Coatings Formed on SiO2-TiO2 Glass Interlayer

Structure, biocompatibility and corrosion resistance of the ceramic-metal surface of porous nitinol

Mechanical Properties, Corrosion Resistance and Bioactivity of Oxide Layers Formed by Isothermal Oxidation of Ti-6Al-7Nb Alloy

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