Effect of nitrogen on corrosion behaviour of a novel high nitrogen medium-entropy alloy CrCoNiN manufactured by pressurized metallurgy

Feng, Hao; Li, Huabing; Wu, Xiaolei; Jiang, Zhouhua; Zhao, Si Cong; Zhang, Tao; Xu, Dake; Zhang, Shucai; Zhu, Hong‐Chun; Zhang, Binbin; Yang, Meng

doi:10.1016/j.jmst.2018.03.021

Cited by 106 publications

(15 citation statements)

References 60 publications

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“…At the same time, their annihilation rate decreases based on reaction (1) in figure 4(c). This will result in the breakdown of passive film and decrease corrosion resistance [24]. The higher passive potential will increase oxygen vacancies based on reaction (3) in figure 4(c), and more oxygen vacancies could also accelerate the adsorption of borate ion.…”

Section: Resultsmentioning

confidence: 99%

Corrosion resistance mechanism of the passive films formed on as-cast FeCoCrNiMn high-entropy alloy

Jinlong

Jin

2020

Mater. Res. Express

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The present work investigates the corrosion resistance of as-cast FeCoCrNiMn high-entropy alloy in borate buffer solution. Compared with 304 and 316L stainless steels steel, as-cast FeCoCrNiMn highentropy alloy exhibited excellent passivation ability. This should be attributed to homogenization of alloying elements. Highly corrosion-resistant elements in as-cast FeCoCrNiMn alloys, for example, Cr, Co and Ni, could promote the formation of protective passive film in borate buffer solution. Moreover, combined effect of high mixing entropy and sluggish diffusion also could improve the corrosion resistance. The formation mechanism of the passive films on the surface of as-cast FeCoCrNiMn alloys satisfied the point defect model.

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Section: Resultsmentioning

confidence: 99%

Corrosion resistance mechanism of the passive films formed on as-cast FeCoCrNiMn high-entropy alloy

Jinlong

Jin

2020

Mater. Res. Express

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“…The Ni 2p3/2 spectra (Figure E) exhibit a peak at 854.8 eV dominated by Ni (OH) 2. The peaks observed at 871.8 eV (Ni 2p5/2) correspond to the Ni (II) oxidation state . The significant amount of Ni (II) species existing in the Pd 36 ‐Ni 7 /Cd 57 /PPy/Ti electrode indicates that electron transfer likely occurs from the Ni atoms to the Pd atoms.…”

Section: Resultsmentioning

confidence: 99%

Pd‐Ni/Cd loaded PPy/Ti composite electrode: Synthesis, characterization, and application for hydrogen storage

et al. 2019

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Summary A wide compositional range of Pd‐Ni/Cd on polypyrrole (PPy)‐modified Ti plates (Pd‐Ni/Cd/PPy/Ti) was fabricated via electrochemical deposition. The hydrogen absorption properties of the prepared Pd‐Ni/Cd/PPy/Ti electrodes were evaluated using cyclic voltammetry and chronoamperometry in acidic media. The optimal Pd36‐Ni7/Cd57/PPy/Ti electrode achieved a hydrogen storage capacity of 331.3 mC cm−2 mg−1 and an H/Pd ratio of 0.77. The enhancement of the hydrogen storage was attributed to a synergistic effect between the Pd‐Ni/Cd catalysts. The surface morphology, crystallinity, and chemical composition of the Pd‐Ni/Cd/PPy/Ti electrode were characterized using scanning electron microscope (SEM), X‐ray diffraction (XRD), and X‐ray photoelectron spectroscopy (XPS), respectively. Hydrogen spillover occurred on the trimetallic catalysts, and secondary hydrogen spillover occurred on the PPy/Ti support. The enhanced hydrogen sorption capacity was due to both the synergistic effect of the trimetallic catalysts and the assistance of PPy, making Pd‐Ni/Cd/PPy/Ti a promising hydrogen storage material.

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“…matrix containing fine AlN particles [49]. A high concentration of nitrogen was also added to the MEA CrCoNi [50] but again resulted in the formation of second phases.…”

Section: Nitrogen Dopingmentioning

confidence: 99%

Interstitials in f.c.c. High Entropy Alloys

Baker

2020

Metals

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The effects of interstitials on the mechanical properties of single-phase f.c.c. high entropy alloys (HEAs) have been assessed based on a review of the literature. It is found that in nearly all studies, carbon increases the yield strength, in some cases by more than in traditional alloys. This suggests that carbon can be an excellent way to strengthen HEAs. This strength increase is related to the lattice expansion from the carbon. The effects on other mechanical behavior is mixed. Most studies show a slight reduction in ductility due to carbon, but a few show increases in ductility accompanying the yield strength increase. Similarly, some studies show little or modest increases in work-hardening rate (WHR) due to carbon, whereas a few show a substantial increase. These latter effects are due to changes in deformation mode. For both undoped and carbon doped CoCrFeMnNi, the room temperature ductility decreases slightly with decreasing grain size until ~2–5 µm, below which the ductility appears to decrease rapidly. The room temperature WHR also appears to decrease with decreasing grain size in both undoped and carbon-doped CoCrFeMnNi and in nitrogen-doped medium entropy alloy NiCoCr, and, at least for the undoped HEA, shows a sharp decrease at grain sizes <2 µm. Interestingly, carbon has been shown to almost double the Hall–Petch strengthening in CoCrFeMnNi, suggesting the segregation of carbon to the grain boundaries. There have been few studies on the effects of other interstitials such as boron, nitrogen and hydrogen. It is clear that more research is needed on interstitials both to understand their effects on mechanical properties and to optimize their use.

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Effect of nitrogen on corrosion behaviour of a novel high nitrogen medium-entropy alloy CrCoNiN manufactured by pressurized metallurgy

Cited by 106 publications

References 60 publications

Corrosion resistance mechanism of the passive films formed on as-cast FeCoCrNiMn high-entropy alloy

Corrosion resistance mechanism of the passive films formed on as-cast FeCoCrNiMn high-entropy alloy

Pd‐Ni/Cd loaded PPy/Ti composite electrode: Synthesis, characterization, and application for hydrogen storage

Interstitials in f.c.c. High Entropy Alloys

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