Study of the surface oxides and corrosion behaviour of an equiatomic CoCrFeMnNi high entropy alloy by XPS and ToF-SIMS

Wang, Luntao; Mercier, Dimitri; Zanna, Sandrine; Seyeux, Antoine; Laurent‐Brocq, Mathilde; Perrière, Loïc; Guillot, Ivan; Marcus, Philippe

doi:10.1016/j.corsci.2020.108507

Cited by 160 publications

(74 citation statements)

References 57 publications

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“…The high frequency induction melting was carried out in a 50 kW Fives Celes (France) furnace operating at a frequency of 150 kHz. Detailed manufacturing and heat treatment process have been described previously [10,28]. Finally, after mechanical and thermal treatment, a grain size of about 30µm has been obtained.…”

Section: Experimental Sample Preparationmentioning

confidence: 99%

“…The native oxide-covered sample was left at open circuit potential for 30 min before stepping the potential at 0.4 V/SCE. This passivation potential corresponds to the middle of the passive region in which the passive current is minimum as observed from polarization curves [10]. After 1 h of anodic passivation, applied potential was cut-off and the sample was emerged, rinsed with ultra-pure water and dried with compressed air.…”

Section: Experimental Sample Preparationmentioning

confidence: 99%

“…The face centered cubic high entropy alloys (CoCrFeMnNi), including the famous Cantor alloy [1] and its derivatives [4], have been largely studied and present interesting mechanical properties compared to conventional alloys [5]. Currently, a significant focus is being made to understand the corrosion resistance of this new class of materials [6][7][8] and the characterization of the protective surface oxide layers [9,10]. Surface analysis, including x-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS), has revealed that the air-formed native oxide film and passive film formed in acid medium on CoCrFeMnNi surfaces present a bilayer stratified structure with a Fe-, Cr-and Co-rich outer layer, and a Mn-and Cr-rich inner layer, and that nickel is enriched in the modified alloy region underneath the oxide film [10].…”

Section: Introductionmentioning

confidence: 99%

“…Currently, a significant focus is being made to understand the corrosion resistance of this new class of materials [6][7][8] and the characterization of the protective surface oxide layers [9,10]. Surface analysis, including x-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS), has revealed that the air-formed native oxide film and passive film formed in acid medium on CoCrFeMnNi surfaces present a bilayer stratified structure with a Fe-, Cr-and Co-rich outer layer, and a Mn-and Cr-rich inner layer, and that nickel is enriched in the modified alloy region underneath the oxide film [10]. A large amount of Cr species (oxide and hydroxide) is observed for the native (46 at.…”

Section: Introductionmentioning

confidence: 99%

“…Several studies have investigated its corrosion behaviour and compared it with that of most common stainless steels [10,26,27]. However, none of them has addressed the oxide film thermal stability or the transport mechanisms governing the oxide growth.…”

Section: Introductionmentioning

confidence: 99%

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Insight on passivity of high entropy alloys: Thermal stability and ion transport mechanisms in the passive oxide film on CoCrFeMnNi surfaces

Wang

Seyeux²,

Perrière³

et al. 2021

Corrosion Science

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The ion transport mechanisms in passive films pre-formed on CoCrFeMnNi high entropy alloy surfaces in acid solution were studied in-situ by time-of-flight secondary ion mass spectrometry upon oxidation in 18 O2 gas. The bilayer structure of the passive film, with outer Fe, Co-rich and inner Cr, Mn-rich layers, is thermally stable, but with reduction of Fe and Co oxides and formation of Mn oxide in the outer layer above 150°C. At 170°C, the transport mechanism is mainly outward cation diffusion with slower inward oxygen diffusion. The re-oxidation growth rate follows a parabolic law and the value of parabolic constant was determined.

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Section: Experimental Sample Preparationmentioning

confidence: 99%

Section: Experimental Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Insight on passivity of high entropy alloys: Thermal stability and ion transport mechanisms in the passive oxide film on CoCrFeMnNi surfaces

Wang

Seyeux²,

Perrière³

et al. 2021

Corrosion Science

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A Comparative Study on Corrosion Behaviors of Fe35Mn10Cr20Ni35 High‐Entropy Alloy and 304 Stainless Steel in Sulfuric Acid Aqueous Solution

Zhou

Jiang²,

Liao

et al. 2022

Adv Eng Mater

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Herein, the corrosion behaviors of Fe35Mn10Cr20Ni35 high‐entropy alloy (HEA) and commercial 304 stainless steel (304 SS) in 0.5 M H2SO4 aqueous solutions are evaluated. Potentiodynamic polarization test results indicate that both the prepared HEA and 304 SS possess a large passive interval, illustrating that they have a strong capability to form passive films. The prepared HEA possesses higher corrosion potentials and lower corrosion current densities than that of 304 SS, thus it has more superior corrosion resistance. The electrochemical impedance spectroscopy and electrical equivalent circuits results indicate that the charge‐transfer resistance of HEA is higher than that of 304 SS and the passive films of the prepared HEA is thicker than that of 304 SS. These indicate that the passive film on the prepared HEA has an excellent protective ability to prevent further corrosion. X‐Ray photoelectron spectroscopy results indicate that the passive film of the prepared HEA samples is mainly composed of compacted metal oxides, especially Cr2O3‐dense oxides, while the passive film of 304 SS is mainly composed of loose hydroxides and compacted metal oxides. That is the key reason why the prepared HEA has better corrosion resistance than 304 SS.

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Quantitative Evaluation of Loss Capability for In Situ Conductive Phase Enhanced Microwave Absorption of High‐Entropy Transition Metal Oxides

Dai

Deng

Zhang

et al. 2022

Adv Funct Materials

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High-entropy oxides (HEO) with high stability and designability are potential microwave absorbers that serve in harsh environments. However, loss design is critical for the absorption performance of HEO due to its weak intrinsic loss capability. Inadequate loss ability results in considerable secondary reflection. Here, an in situ conductive heterogeneous phase is constructed in (Fe 0.2x Co 0.2 Ni 0.2 Cr 0.2 Mn 0.2 ) 3 O 4 (x = 1-5) using a reductive circumstance, to form a dual-phase composite. Both the ohmic and dielectric loss are enhanced as the conductive phase is introduced, while great impedance matching condition is well maintained. Hence, the composites can achieve substantial absorption across the whole X or Ku band with a thin thickness. Furthermore, key efforts are made to reveal the relationship between the absorbing performance and loss capability of an absorber. The analytical expression of the theoretical threshold of attenuation constant is derived. Based on the statistics of experimental data, the broad feasibility and practicability of the proposed theoretical threshold of attenuation constant are confirmed and discussed. Combined with both the theoretical and experimental studies, the mechanism by which the conductive phase contributes to increased absorption is also disclosed, providing an effective basis for the loss design of broadband microwave absorbers.

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Study of the surface oxides and corrosion behaviour of an equiatomic CoCrFeMnNi high entropy alloy by XPS and ToF-SIMS

Cited by 160 publications

References 57 publications

Insight on passivity of high entropy alloys: Thermal stability and ion transport mechanisms in the passive oxide film on CoCrFeMnNi surfaces

Insight on passivity of high entropy alloys: Thermal stability and ion transport mechanisms in the passive oxide film on CoCrFeMnNi surfaces

A Comparative Study on Corrosion Behaviors of Fe35Mn10Cr20Ni35 High‐Entropy Alloy and 304 Stainless Steel in Sulfuric Acid Aqueous Solution

Quantitative Evaluation of Loss Capability for In Situ Conductive Phase Enhanced Microwave Absorption of High‐Entropy Transition Metal Oxides

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