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

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

doi:10.1039/c8ra02031k

Cited by 39 publications

(22 citation statements)

References 81 publications

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“…Tafel extrapolation also yields anodic and cathodic Tafel slopes. The changes in electrochemical behavior are because of changes in microstructure and mechanical properties during welding and subsequent treatments, which were also observed by Aqarni et al [29].…”

Section: Polarization Analysis and Electrochemical Impedance Spectrossupporting

confidence: 65%

Electrochemical Impedance Analysis on Cryogenically Treated Dissimilar Metal Welding of 316L Stainless Steel and Monel 400 Alloy Using GTAW

Mani

Karthikeyan

Kannan

2019

Metals

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An attempt was made to study the corrosion behavior of austenitic stainless-steel SS 316L/Monel 400 alloy dissimilar metal welded joints using gas tungsten arc welding. This combination of welded joints is used in re-heaters and heat exchangers in gas processing and oil refining industries. The welded specimens were subjected to post-weld treatments, such as annealing and deep cryogenic treatment. The welded specimens were sectioned into five different parts: SS 316L base, SS 316L HAZ, weld, Monel HAZ, and Monel base. The polarization method and electrochemical impedance analysis were used to analyze the corrosion resistance in a NaCl solution. A polarization graph, Nyquist plot, and Bode plot were constructed for all regions, separately, for the heat-treated and cryo-treated specimens, to analyze the variation in corrosion resistance in different regions, and then the results were compared. To validate the results of electrochemical impedance analysis, scanning electron microscope (SEM) and energy dispersive spectroscope (EDS) analyses were also performed. The results indicated that the cryo-treated specimens have better corrosion resistance when compared to the annealed ones. Weld region on both specimens exhibited better corrosion resistance when compared to other zones.

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Section: Polarization Analysis and Electrochemical Impedance Spectrossupporting

confidence: 65%

Electrochemical Impedance Analysis on Cryogenically Treated Dissimilar Metal Welding of 316L Stainless Steel and Monel 400 Alloy Using GTAW

Mani

Karthikeyan

Kannan

2019

Metals

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“…The chemistry of the passive layer in each examined case is composed primarily of titanium (IV) oxides, as verified by a strong recorded Ti2p peak doublet, with Ti2p3/2 component located each time at 458.6 eV [35,46,47], Fig. 12.…”

Section: 34chronoamperometry Measurementsmentioning

confidence: 73%

“…7). adsorption processes of passive layer breakdown [35]. The CPE impedance ZCPE = (Q(j) n ) -1 represents a capacitor with capacitance 1/Q for a homogeneous surface n  1.…”

Section: Tc21mentioning

confidence: 99%

Exploring the Influence of the Microstructure on the Passive Layer Chemistry and Breakdown for Some Titanium-Based Alloys in Normal Saline Solution

El-Bagoury¹,

Ibrahim²,

Ali³

et al. 2019

Preprint

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The effect of microstructure and chemistry of passive films on the kinetics of passive layer growth and passivity breakdown of some Ti-based alloys, namely Ti-6Al-4V, Ti-6Al-7Nb and TC21 alloys was studied. The rate of pitting corrosion was evaluated using cyclic polarization measurements. Chronoamperometry was applied to assess the passive layer growth kinetics and breakdown. Microstructure influence on the uniform corrosion rate of these alloys was also investigated employing Tafel extrapolation and dynamic electrochemical impedance spectroscopy. Corrosion studies were performed in 0.9% NaCl solution at 37 oC, and the obtained results were compared with ultrapure Ti (99.99%). The different phases of the microstructure were characterized by X-ray diffraction and scanning electron microscopy. Chemical composition and chemistry of the corroded surfaces were studied using X-ray photoelectron analysis. For all studied alloys, the microstructure consisted of α matrix, which was strengthened by β phase. The highest and the lowest values of the β phase’s volume fraction were recorded for TC21 and Ti-Al-Nb alloys, respectively. The uniform corrosion rate and pitting corrosion resistance (Rpit) of the studied alloys were enhanced following the sequence: Ti-6Al-7Nb < Ti-6Al-4V << TC21. The corrosion resistance of Ti-Al-Nb alloy approached that of pure Ti. The obvious changes in the microstructure of these alloys, together with XPS findings, were adopted to interpret the pronounced variation in their corrosion rates.

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“…This is evident from the values of the EASA depicted in Tables 7 and 8. EASA calculations are briefly reported in Section S5.2 and fully described elsewhere 81 . From Tables 7 and 8, the ZnO/TiO 2 catalyst achieved the largest EASA among the tested catalysts.…”

Section: Resultsmentioning

confidence: 99%

Crystalline ZnO and ZnO / TiO ₂ nanoparticles derived from tert ‐butyl N‐(2 mercaptoethyl)carbamatozinc( II ) chelate: Electrocatalytic studies for H ₂ generation in alkaline electrolytes

et al. 2020

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Summary A newly synthesized zinc(II) complex, namely tert‐butyl N‐(2 mercaptoethyl)carbamatozinc(II) complex [Zn(Boc‐S)2] (Boc = tert‐butyl N‐[2‐mercaptoethyl]carbamate), has been used as an organozinc precursor for the production of crystalline ZnO and ZnO/TiO2 nanoparticles. The synthesized complex and the obtained nanomaterials were fully characterized using various spectroscopic and surface analysis techniques. Their surface morphology, chemical purity and stoichiometry have been investigated by scanning electron microscopy (SEM), energy dispersive X‐ray analysis (EDX) as well as X‐ray fluorescence. The synthesized Zn(II) molecular complex, ZnO and ZnO/TiO2 nanomaterials have been tested in alkaline aqueous solution (1.0 MNaOH) for the hydrogen evolution reaction (HER) using various electrochemical techniques. The results revealed high HER catalytic performance of ZnO and ZnO/TiO2 cathode materials, with the latter exhibiting higher catalytic activity recording an exchange current density (jo) of 0.3 mA cm−2. This current value, which approaches that of Pt wire (0.5 mA cm−2), cross‐sectional area ~0.008 cm2, is about 11 and 100 times greater than those measured for ZnO alone (0.028 mA cm−2) and TiO2 alone (0.0032 mA cm−2), respectively. Moderate catalytic activity was recorded for the complex catalyst, namely GC‐Zn(Boc‐S)2 with jo value of (0.01 mA cm−2). Tafel slope values of 130 and 122 mV dec−1 were calculated for ZnO and ZnO/TiO2, respectively. Such Tafel slope values, which are close to that of the Pt wire (120 mV dec−1), referred to a Volmer‐controlled HER kinetics. Other important electrochemical parameters describing the kinetics of the HER, such as roughness factor (Rf) and turnover frequency (TOF) were also estimated and discussed. The high numerical values of the various HER kinetic parameters recorded for the ZnO/TiO2 catalyst, in addition to its high stability and durability (stable for up to 10 000 continuous cathodic polarization cycles), besides maintaining its morphology and chemical composition after stability test (confirmed from SEM/EDX and XRD examinations), located it in a privileged position among the most efficient HER electrocatalysts reported in the literature.

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Effect of cobalt addition on the corrosion behavior of 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.

Cited by 39 publications

References 81 publications

Electrochemical Impedance Analysis on Cryogenically Treated Dissimilar Metal Welding of 316L Stainless Steel and Monel 400 Alloy Using GTAW

Electrochemical Impedance Analysis on Cryogenically Treated Dissimilar Metal Welding of 316L Stainless Steel and Monel 400 Alloy Using GTAW

Exploring the Influence of the Microstructure on the Passive Layer Chemistry and Breakdown for Some Titanium-Based Alloys in Normal Saline Solution

Crystalline ZnO and ZnO / TiO ₂ nanoparticles derived from tert ‐butyl N‐(2 mercaptoethyl)carbamatozinc( II ) chelate: Electrocatalytic studies for H ₂ generation in alkaline electrolytes

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Effect of cobalt addition on the corrosion behavior of 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.

Cited by 39 publications

References 81 publications

Electrochemical Impedance Analysis on Cryogenically Treated Dissimilar Metal Welding of 316L Stainless Steel and Monel 400 Alloy Using GTAW

Electrochemical Impedance Analysis on Cryogenically Treated Dissimilar Metal Welding of 316L Stainless Steel and Monel 400 Alloy Using GTAW

Exploring the Influence of the Microstructure on the Passive Layer Chemistry and Breakdown for Some Titanium-Based Alloys in Normal Saline Solution

Crystalline ZnO and ZnO / TiO 2 nanoparticles derived from tert ‐butyl N‐(2 mercaptoethyl)carbamatozinc( II ) chelate: Electrocatalytic studies for H 2 generation in alkaline electrolytes

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Crystalline ZnO and ZnO / TiO ₂ nanoparticles derived from tert ‐butyl N‐(2 mercaptoethyl)carbamatozinc( II ) chelate: Electrocatalytic studies for H ₂ generation in alkaline electrolytes