Corrosion resistance improvement of nitinol by anodisation in the presence of molybdate ions

Saugo, Melisa; Flamini, Daniel Omar; Zampieri, G.; Saidman, S.B.

doi:10.1016/j.matchemphys.2017.01.017

Cited by 10 publications

(3 citation statements)

References 18 publications

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“…5. As it can be seen, the current densities obtained are between 2 and 3 mA cm À2 , which are very low if they are compared to the values obtained for NiTi polarized in solutions containing acetic acid or sodium molybdate ( Ref 11,12). Potentiostatic anodization of a valve metal such as Ti leads to an immediate current density increase ( Ref 10).…”

Section: Low-voltage Polarization Of Niti In the Presence Of Aotmentioning

confidence: 90%

“…The addition of a high concentration of an alloying element, which is not a valve metal, inhibits the growth of the oxide layer (Ref 8). This is the case of NiTi, where thinner films were formed and the voltage increase was always much smaller than for pure Ti ( Ref 8,11,12). However, a thin corrosion protective film was formed on NiTi by anodic polarization in acetic acid solution (Ref 11).…”

Section: Introductionmentioning

confidence: 97%

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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: Low-voltage Polarization Of Niti In the Presence Of Aotmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 97%

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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show abstract

“…Those compounds, however, are now forbidden due to high toxicity, i. e., nontoxic and eco‐friendly alternatives are desired. Recently, molybdate and rare earth compounds have been tested as green inorganic inhibitors ,. Even so, it seems that more researchers are focusing on organic additives like heterocyclic and Schiff base compounds, most of which are benign to environment and cost‐effective .…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis of Novel Schiff Bases as Eco‐friendly Corrosion Inhibitors for Mild Steel in Hydrochloric Acid

Zhang

Yang

et al. 2018

ChemistrySelect

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Two novel Schiff bases, (E)-N-(4-hydroxy-3-methoxybenzylidene)lysine (1) and (E)-N-(4-hydroxy-3-methoxybenzylidene) arginine (2) were synthesized by using natural products of amino acid and vanilline, and their inhibitive effect on the corrosion of mild steel in 0.5 mol⋅L À 1 HCl solution was evaluated by various experimental methods such as electrochemical impedance spectroscopy (EIS), potentiodynamic polarization curves, scanning electron microscope (SEM), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). Moreover, quantum chemical calculations and molecular dynamics simulations were used to theoretically explore the internal relation between inhibitory efficiency and molecular structure. The results of EIS show the polarization resistance of mild steel is increased from 6.592 Ω⋅cm 2 to 36.46 Ω⋅cm 2 and 74.78 Ω⋅cm 2 in the presence of 1 and 2, respectively. Tafel curves indicate HMBL and HMBA act as good inhibitors for iron corrosion in hydrochloric acid and that 2 has the better performance than 1. XPS analysis confirms the adsorption of inhibitor molecules on iron surface by forming inhibitor-Fe complex, which is well fitted by Langmuir model.[a] Dr.

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Effect of Synthesis Mode and Ni Particle Size on Microstructural Aspects and Hardness Properties of Combustion-Synthesized NiTi

et al. 2019

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Corrosion resistance improvement of nitinol by anodisation in the presence of molybdate ions

Cited by 10 publications

References 18 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

Green Synthesis of Novel Schiff Bases as Eco‐friendly Corrosion Inhibitors for Mild Steel in Hydrochloric Acid

Effect of Synthesis Mode and Ni Particle Size on Microstructural Aspects and Hardness Properties of Combustion-Synthesized NiTi

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