Electrochemical Properties of Al–based Solid Solutions Alloyed by Element Mg, Ga, Zn and Mn under the Guide of First Principles

Abstract

Molecular simulation method was firstly used for analyzing the energy of aluminum alloy systems alloyed by Mg, Ga, Zn and Mn. Based on the analyses, Al‐Mg, Al‐Ga, Al‐Zn, Al‐Mn alloys were metallurgically prepared. The structures, electrochemical activities and utilization ratios were characterized by X‐ray diffraction patterns (XRD), anodic polarization measurement and galvanostatic discharge. The calculated energies of the aluminum alloy systems increase in the following order: Al< Al‐Mn < Al‐Mg < Al‐Zn < Al‐Ga. The absolute values of the open circuit potentials of the alloys measured in alkaline solution rank in the following orders: φAl‐Ga alloy > φAl‐Zn alloy > φAl‐Mg alloy > φAl‐Mn alloy and the order is consistent with the calculated energies. The results indicate that molecular simulation based on the first‐principles is a useful method in the alloying design and thermodynamic performance prediction. Alloy additives Zn and Ga effectively change the open circuit potential of metal aluminum to a more negative potential. In addition, alloy additive Zn increases the charge transfer resistance of Al→Al3+, which decreases the discharge current density. Alloy additive Mg diminishes the grain size of the alloy and notably enhances the discharge current density. Alloy additive Mn improves the utilization ratio remarkably when discharging in alkaline solution.

Synchronously Producing H2 and Purifying Methyl Orange-Polluted Water through the Reaction of an Al–GaInSn Alloy Plate and H2O

“…In contrast, in Al–Ga-2 with a smooth and dense microstructure (Figures a and c), the reaction with water is expected to be considerably slower. These coarsening effects of the microstructure and their impact on H 2 production yields have also been reported by other groups. ,, …”

“…The same results were obtained using EDS analysis. The low content of Ga, In, and Sn in the hydrolysates implied that these metals did not react with water in the presence of Al. , To further explore the state of GaInSn alloys after the reaction, the reaction products were treated with 0.25 mol L –1 NaOH solution to completely dissolve all the Al products. Because GaInSn alloy does not react with dilute bases, a pure GaInSn phase could be obtained.…”

Anode Interfacial Layer Construction via Hybrid Inhibitors for High-Performance Al–Air Batteries

“…It is generally acknowledged choosing high-purity aluminum as an anode for the AABs because of the absence of Fe impurities which aggravate the corrosion rate of the Al anode. , However, the cost of high-grade aluminum is much higher than commercial aluminum, which cannot meet the need of the commercial applications. Adding the selected elements such as In, Sn, Zn, Pb, Mn, and Sb with high hydrogen evolution overpotential could relieve self-corrosion, which can also improve the electrochemical properties of the Al anode. − However, the alloying process is always carried out at a high temperature, which requires extremely strict equipment, and it is difficult to control the process.…”

Hydrolytic Hydrogen Production on Al–Sn–Zn Alloys Processed by High-Pressure Torsion

“…However, the shifts of Al peaks indicate that Zn gradually dissolved in Al by increasing the shear strain. This formation of a solid solution of Zn in Al is thought to be favourable for corrosion according to some previous studies [ 29 , 30 ]. A previous work carried out by Yi et al pointed out that a slight addition of Zn to Al changed the OCP value from −1.37 V to −1.417 V [ 29 ].…”

“…This formation of a solid solution of Zn in Al is thought to be favourable for corrosion according to some previous studies [ 29 , 30 ]. A previous work carried out by Yi et al pointed out that a slight addition of Zn to Al changed the OCP value from −1.37 V to −1.417 V [ 29 ]. Further evidence was given by Khireche et al [ 30 ], in whose work the addition of Zn to Al shifted the potential of pitting corrosion towards more electronegative values.…”