Corrosion behavior of CoxCrCuFeMnNi high-entropy alloys prepared by hot pressing sintered in 3.5% NaCl solution

Zhao, Runze; Ren, Bo; Cai, Bin; Liu, Zhongxia; Zhang, Guopeng; Zhang, Jianjian

doi:10.1016/j.rinp.2019.102667

Cited by 46 publications

(15 citation statements)

References 25 publications

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“…Qiu 43 did not find a clear connection between the Co content and the corrosion resistance of Al 2 CrFeCo x CuNiTi HEA coating either in alkaline or sodium chloride solutions. Zhao et al 44 , in turn, reported an increase in the passive film stability of sintered Co x CrCuFeMnNi HEAs. According to the authors, such result arises from two factors.…”

Section: Alloy Composition and Passive Film Stabilitymentioning

confidence: 98%

A review on Corrosion of High Entropy Alloys: Exploring the Interplay Between Corrosion Properties, Alloy Composition, Passive Film Stability and Materials Selection

et al. 2022

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The corrosion resistance of high entropy alloys was reviewed in the present work. The main focus was to explore the correlation between alloy composition, passive film stability and corrosion properties and use this information to develop a materials selection procedure based on the Ashby approach. Corrosion current densities and pitting potentials were the main design parameters used to rank different alloys, based on a careful examination of data published in the literature, considering uniform and localized corrosion, respectively. The outputs of the selection process clearly indicated a strong dependence of the corrosion resistance on passive film stability, although microstructural homogeneity and uniform distribution of alloying elements should not be disregarded. Proper combinations of elements such as Co, Al, Ti, Mo and Cr, especially, are effective at enhancing the corrosion resistance of high entropy alloys.

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Section: Alloy Composition and Passive Film Stabilitymentioning

confidence: 98%

A review on Corrosion of High Entropy Alloys: Exploring the Interplay Between Corrosion Properties, Alloy Composition, Passive Film Stability and Materials Selection

et al. 2022

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“…In NaOH, extensive dissolution of Cr was observed, which led to a porous passive film . Impact of additions of Co, Cu, Mn, Al, and Nb on corrosion resistance and passivity of these alloys have been reported but the effect of Fe has so far not been investigated. Fe is known to preferentially dissolve to the benefit of Cr in steels and high entropy alloys. ,, Therefore, it is of interest to investigate what the critical Fe content is for the change in material properties.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Resistance and Catalytic Activity toward the Oxygen Reduction Reaction of CoCrFe_xNi (0 ≤ x ≤ 0.7) Thin Films

Linder

Rao

Boyd

et al. 2022

ACS Appl. Energy Mater.

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Corrosion resistance and catalytic activity toward the oxygen reduction reaction (ORR) in an alkaline environment are two key properties for water recombination applications. In this work, CoCrFe x Ni (0 ≤ x ≤ 0.7) thin films were deposited by magnetron sputtering on polished steel substrates. The native passive layer was 2–4 nm thick and coherent to the columnar grains determined by transmission electron microscopy. The effect of Fe on the corrosion properties in 0.1 M NaCl and 1 M KOH and the catalytic activity of the films toward ORR were investigated. Electrochemical impedance spectroscopy and potentiodynamic polarization measurements indicate that CoCrFe0.7Ni and CoCrFe0.3Ni have the highest corrosion resistance of the studied films in NaCl and KOH, respectively. The high corrosion resistance of the CoCrFe0.7Ni film in NaCl was attributed to the smaller overall grain size, which leads to a more homogeneous film with a stronger passive layer. For CoCrFe0.3Ni in KOH, it was attributed to a lower Fe dissolution into the electrolyte and the build-up of a thick and protective hydroxide layer. Scanning Kelvin probe force microscopy showed no potential differences globally in any of the films, but locally, a potential gradient between the top of the columns and grain boundaries was observed. Corrosion of the films was likely initiated at the top of the columns where the potential was lowest. It was concluded that Fe is essential for the electrochemical activation of the surfaces and the catalytic activity toward ORR in an alkaline medium. The highest catalytic activity was recorded for high Fe-content films (x ≥ 0.5) and was attributed to the formation of platelet-like oxide particles on the film surface upon anodization. The study showed that the combination of corrosion resistance and catalytic activity toward ORR is possible for CoCrFe x Ni, making this material system a suitable candidate for water recombination in an alkaline environment.

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“…In the recent past, high entropy alloys have received noteworthy attention from both engineers and scientists in the field of materials science thanks to their many outstanding properties including excellent resistance to oxidation and corrosion [3], high strength, and high fracture toughness [4] and good thermal stability [5]. The four core effects of HEAs, i.e., high sluggish diffusion, mixing entropy, cocktail effect and lattice distortion are mainly responsible for the emerging enhanced properties of HEAs [6]. Their unusual performances make them convenient for structural and high-temperature applications, such as petrochemicals, power aerospace turbines and generation plants [7].…”

Section: Introductionmentioning

confidence: 99%

Toz metalurjisi ile üretilen CoCrFeNiAl YEA'nın NaCl erimiş tuz içindeki sıcak korozyon davranışı

Garip¹

2022

Politeknik Dergisi

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Corrosion behavior of CoxCrCuFeMnNi high-entropy alloys prepared by hot pressing sintered in 3.5% NaCl solution

Cited by 46 publications

References 25 publications

A review on Corrosion of High Entropy Alloys: Exploring the Interplay Between Corrosion Properties, Alloy Composition, Passive Film Stability and Materials Selection

A review on Corrosion of High Entropy Alloys: Exploring the Interplay Between Corrosion Properties, Alloy Composition, Passive Film Stability and Materials Selection

Corrosion Resistance and Catalytic Activity toward the Oxygen Reduction Reaction of CoCrFe_xNi (0 ≤ x ≤ 0.7) Thin Films

Toz metalurjisi ile üretilen CoCrFeNiAl YEA'nın NaCl erimiş tuz içindeki sıcak korozyon davranışı

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Corrosion behavior of CoxCrCuFeMnNi high-entropy alloys prepared by hot pressing sintered in 3.5% NaCl solution

Cited by 46 publications

References 25 publications

A review on Corrosion of High Entropy Alloys: Exploring the Interplay Between Corrosion Properties, Alloy Composition, Passive Film Stability and Materials Selection

A review on Corrosion of High Entropy Alloys: Exploring the Interplay Between Corrosion Properties, Alloy Composition, Passive Film Stability and Materials Selection

Corrosion Resistance and Catalytic Activity toward the Oxygen Reduction Reaction of CoCrFexNi (0 ≤ x ≤ 0.7) Thin Films

Toz metalurjisi ile üretilen CoCrFeNiAl YEA'nın NaCl erimiş tuz içindeki sıcak korozyon davranışı

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Corrosion Resistance and Catalytic Activity toward the Oxygen Reduction Reaction of CoCrFe_xNi (0 ≤ x ≤ 0.7) Thin Films