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Revista de Chimie (Rev. Chim.), Year 2018, Volume 69, Issue 1, 86-90

https://doi.org/10.37358/RC.18.1.6049

Ioana Arina Gherghescu, Daniela Ionita, Sorin Ciuca, Ruxandra Elena Dumitrescu

Thermal Parameters Influence Assessed by Electrochemical Impedance Spectroscopy on a Ni50Ti48Nb2 Shape Memory Alloy

Abstract:

This paper presents some electrochemical impedance spectroscopy research results concerning the corrosion resistance of a shape memory Ni50Ti48Nb2 alloy. This one was previously studied by SEM and DSC [1,2] but some new research features had to be made clear in order to be able to explain its electrochemical corrosion behavior. The chemical composition Ni50Ti48Nb2 was chosen in order to obtain a shape memory alloy having a wider hysteresis than equiatomic NiTi, for the purpose of achieving a better thermomechanical stability. Cryogenic applications are aimed. After processing the cast ingot, two samples, S1 and S2, were further annealed at 800°C/12 h and, respectively, at 900°C/12h. Scanning electron micrographs together with the chemical elements mapping results were obtained. They were related to the previous results concerning the informations on the structure of the different phases found in this NiTiNb alloy: austenite, martensite and secondary phases, as well as some primary compounds [1,2]. Considering the size and shape of the complex precipitate particles of NiTiNb in the two differently heat treated samples, these were found responsible for some changes in the transformation temperatures [3] but the electrochemical corrosion behavior of the alloy seems to be influenced to a lesser extent by the heat treatments. Both samples exhibit good values of corrosion resistance, however S2 shows better values than S1. Thus lower transformation temperatures and a slightly better corrosion resistance make the Ni50Ti48Nb2 alloy annealed at 900°C/12h subsequently submitted to thermal cycling to be the right choice for producing couplings in the cryogenic industry.
Keywords:
Ni50Ti48Nb2 shape memory alloy; scanning electron microscopy; electrochemical impedance spectroscopy

Issue: 2018, Volume 69, Issue 1
Pages: 86-90
Publication date: 2018/2/15
https://doi.org/10.37358/RC.18.1.6049
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Creative Commons License
This article is published under the Creative Commons Attribution 4.0 International License
Citation Styles
Cite this article as:
GHERGHESCU, I.A., IONITA, D., CIUCA, S., DUMITRESCU, R.E., Thermal Parameters Influence Assessed by Electrochemical Impedance Spectroscopy on a Ni50Ti48Nb2 Shape Memory Alloy, Rev. Chim., 69(1), 2018, 86-90.

Vancouver
Gherghescu IA, Ionita D, Ciuca S, Dumitrescu RE. Thermal Parameters Influence Assessed by Electrochemical Impedance Spectroscopy on a Ni50Ti48Nb2 Shape Memory Alloy. Rev. Chim.[internet]. 2018 Jan;69(1):86-90. Available from: https://doi.org/10.37358/RC.18.1.6049


APA 6th edition
Gherghescu, I.A., Ionita, D., Ciuca, S. & Dumitrescu, R.E. (2018). Thermal Parameters Influence Assessed by Electrochemical Impedance Spectroscopy on a Ni50Ti48Nb2 Shape Memory Alloy. Revista de Chimie, 69(1), 86-90. https://doi.org/10.37358/RC.18.1.6049


Harvard
Gherghescu, I.A., Ionita, D., Ciuca, S., Dumitrescu, R.E. (2018). 'Thermal Parameters Influence Assessed by Electrochemical Impedance Spectroscopy on a Ni50Ti48Nb2 Shape Memory Alloy', Revista de Chimie, 69(1), pp. 86-90. https://doi.org/10.37358/RC.18.1.6049


IEEE
I.A. Gherghescu, D. Ionita, S. Ciuca, R.E. Dumitrescu, "Thermal Parameters Influence Assessed by Electrochemical Impedance Spectroscopy on a Ni50Ti48Nb2 Shape Memory Alloy". Revista de Chimie, vol. 69, no. 1, pp. 86-90, 2018. [online]. https://doi.org/10.37358/RC.18.1.6049


Text
Ioana Arina Gherghescu, Daniela Ionita, Sorin Ciuca, Ruxandra Elena Dumitrescu,
Thermal Parameters Influence Assessed by Electrochemical Impedance Spectroscopy on a Ni50Ti48Nb2 Shape Memory Alloy,
Revista de Chimie,
Volume 69, Issue 1,
2018,
Pages 86-90,
ISSN 2668-8212,
https://doi.org/10.37358/RC.18.1.6049.
(https://revistadechimie.ro/Articles.asp?ID=6049)
Keywords: Ni50Ti48Nb2 shape memory alloy; scanning electron microscopy; electrochemical impedance spectroscopy


RIS
TY - JOUR
T1 - Thermal Parameters Influence Assessed by Electrochemical Impedance Spectroscopy on a Ni50Ti48Nb2 Shape Memory Alloy
A1 - Gherghescu, Ioana Arina
A2 - Ionita, Daniela
A3 - Ciuca, Sorin
A4 - Dumitrescu, Ruxandra Elena
JF - Revista de Chimie
JO - Rev. Chim.
PB - Revista de Chimie SRL
SN - 2668-8212
Y1 - 2018
VL - 69
IS - 1
SP - 86
EP - 90
UR - https://doi.org/10.37358/RC.18.1.6049
KW - Ni50Ti48Nb2 shape memory alloy
KW - scanning electron microscopy
KW - electrochemical impedance spectroscopy
ER -


BibTex
@article{RevCh2018P86,
author = {Gherghescu Ioana Arina and Ionita Daniela and Ciuca Sorin and Dumitrescu Ruxandra Elena},
title = {Thermal Parameters Influence Assessed by Electrochemical Impedance Spectroscopy on a Ni50Ti48Nb2 Shape Memory Alloy},
journal = {Revista de Chimie},
volume = {69},
number = {1},
pages = {86-90},
year = {2018},
issn = {2668-8212},
doi = {https://doi.org/10.37358/RC.18.1.6049},
url = {https://revistadechimie.ro/Articles.asp?ID=6049}
}
 
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