Anodic behavior of Mg in acidic AlCl3–1-ethyl-3-methyl-imidazolium chloride ionic liquid

Xu, Bajin; Qu, R.T.; Ling, Guoping

doi:10.1016/j.electacta.2014.10.071

Cited by 12 publications

(7 citation statements)

References 25 publications

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“…In an electrochemical etching study, anodic behavior of Mg in 1-ethyl-3-methylimidazolium chloride-AlCl 3 ionic liquid was investigated by Xu and co-workers . During this experiment dissolution of Mg under anodic polarization occurred after the breakdown of the oxide film and a formation of a viscous layer was observed at the Mg-ionic liquid interface during the dissolution process.…”

Section: Applications Of Acidic Ionic Liquidsmentioning

confidence: 99%

Acidic Ionic Liquids

2016

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Ionic liquid with acidic properties is an important branch in the wide ionic liquid field and the aim of this article is to cover all aspects of these acidic ionic liquids, especially focusing on the developments in the last four years. The structural diversity and synthesis of acidic ionic liquids are discussed in the introduction sections of this review. In addition, an unambiguous classification system for various types of acidic ionic liquids is presented in the introduction. The physical properties including acidity, thermo-physical properties, ionic conductivity, spectroscopy, and computational studies on acidic ionic liquids are covered in the next sections. The final section provides a comprehensive review on applications of acidic ionic liquids in a wide array of fields including catalysis, CO2 fixation, ionogel, electrolyte, fuel-cell, membrane, biomass processing, biodiesel synthesis, desulfurization of gasoline/diesel, metal processing, and metal electrodeposition.

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Section: Applications Of Acidic Ionic Liquidsmentioning

confidence: 99%

Acidic Ionic Liquids

2016

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“…It was noteworthy that, in order to remove the freshly formed oxides, the U working electrodes were mechanical polished under Ar flow in the glove box pior to potentiodynamic polarization experiments. 14 In the case of the potentiodynamic polarization experiments for several scan times, four uranium pieces of the same exposing area with the same pretreatment were used. A typical potential transient curved was obtained by galvanostatic experiment.…”

Section: Methodsmentioning

confidence: 99%

Fundamental Aspects of Uranium Electropolishing in AlCl₃-1-ethyl-3-Methylimidazolium Chloride Ionic Liquid

Jiang¹,

Fang²,

Luo³

et al. 2018

J. Electrochem. Soc.

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A smooth and flat uranium surface with trace of well-defined grain boundaries has been obtained by electropolishing in the Lewis acidic AlCl 3 -1-ethyl-3-methylimidazolium chloride ionic liquid. The surface roughness Ra and Ry of the uranium reduced substantially from 130.1 nm and 899.4 nm to 16.77 nm and 206.89 nm after electropolishing, respectively. The underlying mechanism of electropolishing has been investigated by the combination of electrochemical, spectroscopic and surface characterization methods. A current density plateau in the measured polarization curves of uranium is observed, which is directly related to the mass transport limit of U 3+ . The mass transport mechanism of the process follows the salt precipitation model, and the precipitate is proposed to be in the form of U(Al 2 Cl 7 ) x (AlCl 4 ) 3-x Uranium (U) has been used in military and civilian applications due to its high density and nuclear properties. Mechanical polishing is usually used to reduce the surface roughness of uranium, which could remove the mechanically damaged surface layer and determine the metallographic structure of uranium. However, typical mechanical polishing of uranium is problematic due to its radioactivity and toxicity produced by aerosol.1 Electropolishing is a more suitable method for the polishing of uranium, which could avoid the generation of aerosol. However, there are major limitations associated with the method -most notably that the extensive gas evolution with low current efficiency occurs, along with etch pits and environmental concerns.2 It is proposed that a non-aqueous solution could eliminate the above-mentioned difficulties.Ionic liquids (ILs) served as new non-aqueous solvents have been employed in the field of electropolishing.3-5 The advantage of using ILs is that high current efficiency could be obtained with negligible gas evolution at the anode/solution interface. The liquid used is comparatively benign and non-corrosive compared to the current aqueous acid solutions and bears the potential for repeated usage. Among a large variety of ILs, AlCl 3 -1-ethyl-3-methylimidazolium chloride (AlCl 3 -EMIC) is an appropriate alternative with the merits of high ionic conductivity, low viscosity and wide potential window. 6 We have previously shown that metal uranium can be oxidized to U 3+ and the corresponding products accumulated on the metal/ILs interface form a viscous layer, which could facilitate a uniform dissolution of the substrate surface. Normally, this uniform dissolution could lead to electropolishing under optimum parameters. 8 The study of mass transport mechanisms in electrodissolution systems is critical for the optimization of operating parameters. As reported, mass transport mechanisms of electrodissolution vary from mass transport limiting species. The mass transport limiting species could be the cations of the dissolving metal (salt precipitation mechanism), the anions from the electrolyte (acceptor mechanism), or the water (water mechanism). 9 The salt precipitation mechanism des...

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“…demonstrated the nucleation and growth mechanism of Al in the ChCl–urea deep eutectic solvent ionic liquid . Xu et al investigated the anodic behavior of Mg in the acidic AlCl 3 –EMIC ionic liquid . Tang et al performed zinc (Zn) immersion pretreatment for the AZ91D Mg alloy with the bipolar current pulse technique to increase the bonding force and anticorrosion ability of the Al coating. , Ueda et al applied ethylene glycol as an effective additive to obtain a flat Al coating with mirrorlike appearance on the AZ121 Mg alloy .…”

Section: Introductionmentioning

confidence: 99%

Design and Fabrication of a Sandwichlike Zn/Cu/Al–Zr Coating for Superior Anticorrosive Protection Performance of ZM5 Mg Alloy

Chen

Yang

Wang

et al. 2021

ACS Appl. Mater. Interfaces

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A new three-layered film was fabricated on magnesium (Mg) alloy via electroplating to guard against corrosion in a chloride aqueous environment, which consisted of an underlying double-layered zinc/copper (Zn/Cu) and a top aluminum–zirconium (Al–Zr) layer. The Zn/Cu underlayers not only impeded the galvanic corrosion between the Al–Zr coating and Mg alloy but also improved the adhesive ability between the substrate and the upper Al–Zr layer. Herein, we discussed the nucleus sizes of Al–Zr coatings at the stage of nucleation carried out with different contents of ZrCl4 in AlCl3–1-butyl-3-methylimidazolium chloride ionic liquid. The sandwichlike three-layered Zn/Cu/Al–Zr coatings were systematically investigated by surface morphology, phase structure, hardness, anticorrosion performances, and first-principles calculations. The corrosion current density declined from 1.461 × 10–3 A·cm–2 of bare Mg to 4.140 × 10–7 A·cm–2 of the Zn/Cu/Al–Zr3 sample. Neutral salt spray testing demonstrated that the Zn/Cu/Al–Zr3 sample showed no evident signs of corrosion after 6 days of exposure. The enhancement of the corrosion protection property was related to the fact that the application of the Cu layer changed the corrosion direction from initial longitudinal corrosion to extended lateral corrosion and the top Al–Zr coating hindered the transmission of aggressive ions. In addition, upon increasing the Zr content in the alloy films, the Fermi energy reduced initially and then increased. The Al–Zr3 alloy with 8.3 atom % Zr showed the lowest Fermi energy (−3.0823 eV), which exhibited the most efficient corrosion protection. These results showed that the prepared three-layered coating provided reliable corrosion protection to Mg alloy and may thus promote its practical applications.

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Anodic behavior of Mg in acidic AlCl3–1-ethyl-3-methyl-imidazolium chloride ionic liquid

Cited by 12 publications

References 25 publications

Acidic Ionic Liquids

Acidic Ionic Liquids

Fundamental Aspects of Uranium Electropolishing in AlCl₃-1-ethyl-3-Methylimidazolium Chloride Ionic Liquid

Design and Fabrication of a Sandwichlike Zn/Cu/Al–Zr Coating for Superior Anticorrosive Protection Performance of ZM5 Mg Alloy

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Anodic behavior of Mg in acidic AlCl3–1-ethyl-3-methyl-imidazolium chloride ionic liquid

Cited by 12 publications

References 25 publications

Acidic Ionic Liquids

Acidic Ionic Liquids

Fundamental Aspects of Uranium Electropolishing in AlCl3-1-ethyl-3-Methylimidazolium Chloride Ionic Liquid

Design and Fabrication of a Sandwichlike Zn/Cu/Al–Zr Coating for Superior Anticorrosive Protection Performance of ZM5 Mg Alloy

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Fundamental Aspects of Uranium Electropolishing in AlCl₃-1-ethyl-3-Methylimidazolium Chloride Ionic Liquid