Al–Zn Aluminum–Zinc system

Zn alloy electrodes containing 10 wt. % Al were prepared to examine the applicability as anodes in primary Zn–air batteries with neutral 2M NaCl electrolyte. These electrodes were investigated by electrochemical measurements and microscopic techniques (SEM, LSM, AFM). Based on the cyclic voltammetry and intermediate term (24 h) discharge experiments, the only active element in the as-prepared alloy was found to be Zn. It was further confirmed by LSM that Zn rich areas dissolved while Al remained passive during discharge. The passive state of Al was also demonstrated by conductive AFM investigations on the as-cast alloy surfaces. The results on potentiodynamic polarization and weight loss measurements indicated that the alloy electrode was less prone to corrosion than pure Zn electrode. The electrochemical behavior of the electrodes was modified under certain cathodic polarization previous to measurements. Accordingly, originating from Al activation due to application of cathodic potentials, potentiodynamic polarization studies showed a clear shift on the corrosion potentials of the alloy toward more negative values. On the basis of these results, with the precondition of Al activation prior to discharge experiments, the effect of Al alloying on the Zn electrodes was revealed as temporarily enhanced potentials on the discharge profiles in comparison to pure Zn electrodes.

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“…Phase diagram of binary Zn-Al alloy. The figure is constructed from Mondolfo (1976), Goldak and Gordon Parr (1964), and Wei et al (2019). …”

Section: Resultsmentioning

confidence: 99%

Influence of Al Alloying on the Electrochemical Behavior of Zn Electrodes for Zn–Air Batteries With Neutral Sodium Chloride Electrolyte

et al. 2019

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“…Zinc-added aluminum alloys are widely used in transportation equipment such as aircraft, railway vehicles, and automobiles. [1][2][3][4][5][6] According to the Al-Zn binary phase diagram, 7 intermetallic compounds are not formed, and only a solid solution of Zn is formed in Al. The potential of Al-Zn alloys decreases as the amount of Zn addition increases when placed in a solution containing 53 g/L NaCl + 3 g/L H 2 O 2 .…”

Section: Introductionmentioning

confidence: 99%

Anodic Dissolution during Electrorefining of Al–Zn Alloys in Lewis Acidic AlCl<sub>3</sub>–EmImCl Ionic Liquid

NUNOMURA,

MATSUSHIMA,

KYO

et al. 2024

Electrochemistry

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The anodic dissolution reaction of Al-Zn alloys containing a Zn solid solution in Lewis acidic AlCl 3 -1-ethyl-3-methyl-imidazolium chloride (EmImCl) ionic liquids at various potentials is investigated herein. An enrichment layer was formed on the anode surface after applying constant potentials of 0.3 and 0.7 V in the 60 mol%AlCl 3 -40 %EmImCl (60 % AlCl 3 ) electrolyte and 0.2 V in the 67 mol%AlCl 3 -33 %EmImCl (67 %AlCl 3 ) electrolyte. Consequently, metallic Zn was detected in the enriched layer using X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). Notably, in the 60 %AlCl 3 electrolyte, high-purity Al was obtained at a much nobler potential than the dissolution potential of pure Zn, suggesting that the anodic dissolution of Zn from the Al-Zn alloy into the electrolyte was difficult. When electrorefining Al-Zn alloy anodes containing a Zn solid solution using 60 %AlCl 3 , which has lower acidity than the 67 %AlCl 3 electrolyte, it is possible to increase the anodic potential from 0.2 to 0.7 V. At this higher potential, high-purity Al is obtained at the cathode.

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Al–Zn Aluminum–Zinc system

Cited by 2 publications

References 29 publications

Influence of Al Alloying on the Electrochemical Behavior of Zn Electrodes for Zn–Air Batteries With Neutral Sodium Chloride Electrolyte

Influence of Al Alloying on the Electrochemical Behavior of Zn Electrodes for Zn–Air Batteries With Neutral Sodium Chloride Electrolyte

Anodic Dissolution during Electrorefining of Al–Zn Alloys in Lewis Acidic AlCl<sub>3</sub>–EmImCl Ionic Liquid

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