Effect of cobalt addition on the corrosion behavior of near equiatomic NiTi shape memory alloy in normal saline solution: electrochemical and XPS studies - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue RSC Advances Année : 2018

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

Nawal Alqarni
  • Fonction : Auteur
Nader El-Bagoury
  • Fonction : Auteur
Jacek Ryl
Mohammed Amin
  • Fonction : Auteur
Rabah Boukherroub

Résumé

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 °C 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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Matériaux
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Dates et versions

hal-02375210 , version 1 (11-07-2022)

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Paternité - Pas d'utilisation commerciale

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Nawal Alqarni, Joanna Wysocka, Nader El-Bagoury, Jacek Ryl, Mohammed Amin, et al.. Effect of cobalt addition on the corrosion behavior of near equiatomic NiTi shape memory alloy in normal saline solution: electrochemical and XPS studies. RSC Advances, 2018, 8 (34), pp.19289-19300. ⟨10.1039/c8ra02031k⟩. ⟨hal-02375210⟩
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