Effect of cobalt addition on the corrosion behaviorof near equiatomic NiTi shape memory alloy in normal saline solution: electrochemical and XPS studies

Nawal D. Alqarni; Joanna Wysocka; Nader El-bagoury; Jacek Ryl; Mohammed Amin; Rabah Boukherroub

doi:10.1039/c8ra02031k

Effect of cobalt addition on the corrosion behaviorof near equiatomic NiTi shape memory alloy in normal saline solution: electrochemical and XPS studies

Abstract

The electrochemical and corrosion (uniform and localized) behavior of a binary Ni52Ti48 shape memory alloy (SMA) and two ternary Ni52Ti48-xCox (x = 1.5 and 4.0 wt.%) SMAs were studied. Measurements were conducted in 0.9% NaCl solution at 37 oC employing various electrochemical methods. These include: linear polarization resistance (LPR), linear sweep voltammetry (LSV), chronoamperometry and dynamic electrochemical impedance spectroscopy (DEIS). Such measurements were complemented with scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) analysis. Results revealed that the addition of alloyed Co to NiTi significantly reduced the uniform corrosion rate of the studied SMA and greatly enhanced its pitting corrosion resistance. XPS measurements evidenced high stability of the passive layer and limited adsorption of chloride ions. Additionally, it was found that the passive layer remained primarily composed of titanium oxides. Microstructure changes accompanying the addition of Co were also used to account for its role in improving the corrosion resistance of these materials.

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Authors (6)

Nawal D. Alqarni
- Taif University Department of Chemistry
Joanna Wysocka dr inż.
Nader El-bagoury
- Taif University Department of Chemistry
Jacek Ryl dr hab. inż.
Mohammed Amin Prof.
- Taif University Department of Chemistry
Rabah Boukherroub
- University Lille CNRS

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Category:

Articles

Type:

artykuł w czasopiśmie wyróżnionym w JCR

Published in:

RSC Advances no. 8, pages 19289 - 19300,
ISSN: 2046-2069

Language:

English

Publication year:

2018

Bibliographic description:

Alqarni N., Wysocka J., El-Bagoury N., Ryl J., Amin M., Boukherroub R.: Effect of cobalt addition on the corrosion behaviorof near equiatomic NiTi shape memory alloy in normal saline solution: electrochemical and XPS studies// RSC Advances. -Vol. 8, nr. 34 (2018), s.19289-19300

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