Transition metal-based high entropy alloy microfiber electrodes: Corrosion behavior and hydrogen activity

Sarac, Baran; Zadorozhnyy, V.Yu.; Ivanov, Yurii P.; Spieckermann, Florian; Klyamkin, S. N.; Berdonosova, Elena; Серов, М. М.; Kaloshkin, S.D.; Greer, A.L.; Saraç, A. Sezai̊; Eckert, Jürgen

doi:10.1016/j.corsci.2021.109880

Cited by 21 publications

(8 citation statements)

References 39 publications

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“…The BCC structure was also corroborated previously by selected-area electron diffraction performed using transmission electron microscopy. In addition, the cross-sectional investigation by HAADF-STEM analysis corroborated the defect-free structure with high compositional homogeneity [28].…”

Section: Morphology and Structural Analysis Of As-quenched Fibermentioning

confidence: 52%

“…Discrete fibers with sizes of components smaller than those of traditional spraying can be achieved using this method [18]. The compositional homogeneity of the microfibers was previously verified by cross-sectional high-angle annular dark-fieldscanning transmission electron microscopy (HAADF-STEM) and elemental mapping with energy-dispersive X-ray [28]. The microfibers were rectangular in cross-section and had an average width of 235 ± 15 µm, a thickness of 15.3 ± 1 µm, and a length of 2 ± 0.2 cm.…”

Section: Hea-microfiber Synthesismentioning

confidence: 91%

“…For these reasons, we increased the amount of Ti and Zr while retaining Ta. Our initial trial of this composition in 0.9 wt% NaCl at room temperature yielded promising results (Figure 6 in [28]). In the current study, frequency-dependent alterations as a function of immersion time were examined by electrochemical impedance spectroscopy (EIS) and simulated by a suitable equivalentcircuit model (ECM) to extract the resistive and capacitive behavior of the bulk sample and the formed oxide layer.…”

Section: Introductionmentioning

confidence: 98%

“…However, the samples were either in bulk, ribbon, or nanocatalyst forms. Our recent publication [28] focuses on the electrochemical-corrosion behavior and hydrogen activity of transition-metal-based HEA microfibers composed of IVB (Ti, Zr, Hf) and Metals 2023, 13, 951 2 of 16 VB (V, Nb, Ta) elements in 1 M KOH solution using potentiodynamic polarization, Tafel fitting, and the Butler-Volmer equation. The main findings indicated ultra-low corrosion down to several microns per year and a stable supercapacitive response over a wide range of frequencies originating from the oxide-layer formation.…”

Section: Introductionmentioning

confidence: 99%

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Time-Resolved Corrosion Behavior of Transition-Metal-Based High-Entropy Alloy in Saline and Phosphate Buffer Solutions

Sarac

2023

Metals

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This study focuses on time-resolved surface modifications of a single-phase Ti25Zr25Nb15V15Ta20 high-entropy alloy (HEA) when immersed in 0.9 wt% NaCl and phosphate-buffer solutions (PBS) at 37 °C. A remarkable transition from high ionic diffusion to electron conduction was observed in PBS, whereas the existing conductivity in NaCl solution was further enhanced after 3 h of exposure. During in-situ testing, NaCl improved passivation conceived by the decrease in passivation-current density and increase in Tafel slope. Heterogeneously dispersed oxide particles with NaCl could have accounted for the moderate increase in conductivity while not affecting the capacitive behavior. The Tafel slope decreased after 2 h of immersion in PBS linked to K+ and P−3 accumulation on the surface. The pronounced change in the post-PBS treated sample was also revealed by a four-fold increase in HEA-electrolyte resistance. A visible decrease in the constant-phase-element parameter of the HEA-electrolyte interface after long-term PBS immersion indicated a rise in electrode conductivity and ionic build-up on the surface. The findings suggest that compared to PBS, the selected HEA has a faster passive-layer formation in NaCl with smaller changes in interface resistivity upon long-term immersion, which is promising for enhanced protein-adsorption rates and loading amount.

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Section: Morphology and Structural Analysis Of As-quenched Fibermentioning

confidence: 52%

Section: Hea-microfiber Synthesismentioning

confidence: 91%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Time-Resolved Corrosion Behavior of Transition-Metal-Based High-Entropy Alloy in Saline and Phosphate Buffer Solutions

Sarac

2023

Metals

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“…The theoretical density, ρ ≈ 7.98 g cm −3 71 , and the equivalent weight, EW ≈ 18.70, of the considered alloys are calculated using the formulas in ref. 72 . The average annual corrosion rate (ACR) of the samples was calculated using Eq.…”

Section: Methodsmentioning

confidence: 99%

Enhanced Electrochemical and Corrosion Behavior of Amorphous 316-type Stainless Steel Microfibers in Saline Environment

Sarac

Sharifikolouei

Zheng

et al. 2023

Preprint

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The resistance of commercial stainless steel (SS) types in harsh environments is problematic because of the breakdown of the passive chromium oxide layer. This study reports fully amorphized 316 SS microfibers using a customized multi-nozzled melt-spinning technique. Electrochemical tests in 3.5 wt.% NaCl shows a high corrosion resistance with an annual corrosion rate of less than 60 µm year–1 under ambient conditions, which increases slightly as the temperature rises to 50°C. The room temperature sample also shows a low passivation current at the level of 10–4 A cm–2 with long-term stability, and no pitting is observed for all the samples until 1.5 V. The sample polarized at 37°C shows the smallest bulk resistance (~ 1400 Ω cm2) and the largest double-layer capacitance (28.6 µF cm–2), where large amounts of salt accumulation on the surface creating a passive layer on the microfibers were detected by energy dispersive X-ray (EDX)–scanning electron microscopy. Cross-sectional investigation by EDX-scanning transmission electron microscopy corroborates the homogenous bulk composition and Fe-rich, Ni and Cr-containing amorphous oxides, both of which contribute to the enhanced corrosion and passivation properties compared to commercial SS counterparts in the literature.

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Influence of Postprocessing on Microstructural and Tribological Behavior of HVOF-Sprayed HEA Coating

Abhijith,

Kumar

2024

Lecture Notes in Mechanical Engineering

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Transition metal-based high entropy alloy microfiber electrodes: Corrosion behavior and hydrogen activity

Cited by 21 publications

References 39 publications

Time-Resolved Corrosion Behavior of Transition-Metal-Based High-Entropy Alloy in Saline and Phosphate Buffer Solutions

Time-Resolved Corrosion Behavior of Transition-Metal-Based High-Entropy Alloy in Saline and Phosphate Buffer Solutions

Enhanced Electrochemical and Corrosion Behavior of Amorphous 316-type Stainless Steel Microfibers in Saline Environment

Influence of Postprocessing on Microstructural and Tribological Behavior of HVOF-Sprayed HEA Coating

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