The anodically polarized Mg surface products and accelerated hydrogen evolution

Huang, Jufeng; Song, Guang‐Ling; Zhu, Yaxian; Zheng, Dajiang; Wang, Zi Ming

doi:10.1016/j.jma.2021.05.008

Cited by 27 publications

(17 citation statements)

References 47 publications

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“…In the equal channel extrusion zone, the slopes of rising for extrusion forces are different due to the in uences of the angles. When the channel angle is smaller, the slope of the extrusion force increase is larger, and the nal stable extrusion force is larger [14][15][16][17][18][19][20].…”

Section: Effects Of Different Channel Angles On Extrusion Forcesmentioning

confidence: 99%

“…The thermal conductivity between the die and blank was set to 11 N/℃s.mm². Different friction factors (0.08,0.3,0.7), different extrusion ratios (12,18,22), different extrusion velocities (2mm/s, 10mm/s, 20mm/s) and different initial temperatures (350℃,380℃,400℃) are adopted to analyze the in uences of temperature elds during ES process with different technological conditions [21][22].…”

Section: Variation In the Temperature Eld During The Es Processmentioning

confidence: 99%

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A Special Extrusion-shear Manufacturing Method for Magnesium Alloy Rods Based on Finite Element Numerical Simulation and Experimental Verification

Zhang

Huang

Zhang

et al. 2022

Preprint

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To research the influences of process parameters on a special extrusion-shearmanufacture method for magnesium alloy rods, deform-3d software with finite elementsimulations has been used to analyze the material flows of deformed magnesium alloysAZ31B during the extrusion-shear (ES) process, as well as the grain sizes anddistribution of extrusion loads, stresses and strains, and blank temperatures. Temperaturefields, stress fields, strain fields and temperature fields varying with different blankpreheating temperatures, extrusion speed and extrusion ratios were simulated. Influences ofdifferent extrusion conditions and different die structures on microstructures of rods prepared by ES process has been researched. Extrusion forces decrease with the increasing extrusion temperatures, decreasing extrusion ratios, increasing die channel angles and decreasing friction coefficients. The flow velocities of metal in the ES die increase with development of ES process. Increasing the channel angles and reducing the friction factors would increase the outflow velocities of metal, but it has little effect on the uniformity of metal flow. The increase in friction and extrusion speed would increase the temperatures of the ES die. The ES process can prepare finer and more uniform microstructures than those prepared by direct extrusion under the same conditions.

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Section: Effects Of Different Channel Angles On Extrusion Forcesmentioning

confidence: 99%

Section: Variation In the Temperature Eld During The Es Processmentioning

confidence: 99%

A Special Extrusion-shear Manufacturing Method for Magnesium Alloy Rods Based on Finite Element Numerical Simulation and Experimental Verification

Zhang

Huang

Zhang

et al. 2022

Preprint

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“…This model is termed as "incomplete film univalent Mg + ion mechanism", and electrochemical reaction 2 is the ratedetermining step, immediately followed by electrochemical reaction 3 and chemical reaction 4. 8 The k value is between 0 and 1 (0 ≤ k ≤ 1), corresponding to the ratio of the rate of reaction 3 and the rate of the total process (i.e., reactions 3 and 4). 9 As reaction 4 can only occur in a film-free area, an integrated passive film may lead to k → 1.…”

Section: Introductionmentioning

confidence: 99%

“…Its hydrogen evolution reaction (HER) is accelerated by the anodic polarization. 8 This HER resulting from anodic dissolution (eqs 2−4) is termed as "anodic hydrogen evolution", which differs from the traditional "cathodic hydrogen evolution". An ideal Mg anode should have no NDE or HER during the discharging process.…”

Section: Introductionmentioning

confidence: 99%

“…25 The main reason for this is that the solubility of most alloying elements in Mg is quite low and intermetallic phases are often present in Mg matrix, accelerating HER dramatically. 8 Therefore, the current study has used the magnetron sputtering method to produce single-phase Mg−Zn alloys. These alloys are rather different from the Mg−Zn-based anodes in the literature that contain substantial second phases or trace Zn dissolved in Mg matrix.…”

Section: Introductionmentioning

confidence: 99%

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Achieving Ultrahigh Anodic Efficiency via Single-Phase Design of Mg–Zn Alloy Anode for Mg–Air Batteries

Xiao

Cao

Ying

et al. 2021

ACS Appl. Mater. Interfaces

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Magnesium−air battery has been considered promising for electrochemical energy storage or as a conversion device due to its high theoretical energy density and low cost. However, the experimental energy density is far lower than the theoretical value due to the intense hydrogen evolution of the Mg anode upon discharging. Herein, we have successfully developed a novel Mg 64 Zn 36 (at. %) alloy via single-phase design. The as-prepared Mg 64 Zn 36 anode possesses a high discharge specific capacity of 1302 ± 70 mAh g −1 and extraordinarily high efficiency of 94.8 ± 4.9%, which breaks the records of efficiency among all of the reported Mg anodes. The superior high efficiency is attributed to the anodic hydrogen evolution being inhibited by Zn alloying, which passivates the Mg matrix. The intermediate ion Mg + produced during discharging is dramatically limited by the integrated passive film and is totally converted into Mg 2+ electrochemically through the film. Meanwhile, the uniform discharging products due to the homogeneous microstructure of Mg 64 Zn 36 co-contribute to the high efficiency. The design of the Mg−Zn alloy may open a new avenue for the development of Mg−air batteries.

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A new method of processing magnesium alloy thin-walled tube by direct extrusion and corrugated equal channel angular extrusion

Zhang

Huang

Gang

et al. 2022

Int J Adv Manuf Technol

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The anodically polarized Mg surface products and accelerated hydrogen evolution

Cited by 27 publications

References 47 publications

A Special Extrusion-shear Manufacturing Method for Magnesium Alloy Rods Based on Finite Element Numerical Simulation and Experimental Verification

A Special Extrusion-shear Manufacturing Method for Magnesium Alloy Rods Based on Finite Element Numerical Simulation and Experimental Verification

Achieving Ultrahigh Anodic Efficiency via Single-Phase Design of Mg–Zn Alloy Anode for Mg–Air Batteries

A new method of processing magnesium alloy thin-walled tube by direct extrusion and corrugated equal channel angular extrusion

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