Electrochemical response of VxOy-Al2O3 composite layer with dark-green color achieved by plasma electrolytic oxidation

Kwon, Joong Ho; Fatimah, Siti; Baek, Suk Hwan; Kim, Y.G.; Yang, Haozhe; Ko, Young-Gun

doi:10.1016/j.jallcom.2020.154367

Cited by 15 publications

(5 citation statements)

References 38 publications

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“…Nanocomposites changed their colour after UV irradiation from light green to pale blue in 1V2O5-EPE/CTA nanocomposite and from light green to darker green in the remaining ones. This blue colour indicated that vanadium presented an oxidation state of +4 [18], as a consequence of a reduction process from +5 to +4 [17,19]. As observed in Figure 4, this colour change was more noticeable in the case of V2O5-EPE/CTA nanocomposites, being almost indiscernible for V2O5/CTA nanocomposites.…”

Section: Uv-vis Spectramentioning

confidence: 69%

Optical Properties of Vanadium Oxide/Cellulose Triacetate Photochromic Films

Gomez-Hermoso-de-Mendoza

Gutierrez

Tercjak

2020

The First International Conference on &Amp;ldquo;Green” Polymer Materials 2020

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The properties of polymer-based nanocomposites strongly depend on the fillers added and their dispersion on the matrix. Proposing a simple method that can control these variables is essential to obtain nanocomposites with enhanced properties. In this study, cellulose triacetate based nanocomposites modified with sol-gel synthesised vanadium oxide nanoparticles (V2O5) and poly(ethylene oxide-b-propylene oxide-b-ethylene oxide) (PEO-b-PPO-b-PEO or EPE) triblock copolymer were obtained by two methods: solvent casting (SC, drying at ambient conditions) and solvent vapour annealing (SVA, drying under solvent vapour atmosphere). Nanocomposites were characterised by Fourier-transform infrared spectroscopy (FTIR) and UV-vis spectroscopy. Nanocomposites presented green colour and high transparency, improving the SVA method the surface finish of the films. Moreover, V2O5 nanoparticles provided switchable photochromic properties, changing the film colour from green to pale blue when exposed to UV radiation. Nanocomposites with EPE triblock copolymer presented a more noticeable colour change. As for the speed of the recovery process to the initial state, it increased with the addition of EPE and the sol-gel content. Thus, it was proved that the SVA preparation method was more appropriate that the SC, as well as corroborate that the EPE triblock copolymer and the sol-gel content affected the properties of developed CTA nanocomposites.

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Section: Uv-vis Spectramentioning

confidence: 69%

Optical Properties of Vanadium Oxide/Cellulose Triacetate Photochromic Films

Gomez-Hermoso-de-Mendoza

Gutierrez

Tercjak

2020

The First International Conference on &Amp;ldquo;Green” Polymer Materials 2020

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“…Incorporating metallic oxide particles into the PEO coating via electrochemical and electrophoretic mechanisms has been highlighted as an efficient method for boosting their protective a ributes [12]. Numerous particles, including SiO2, ZrO2, MoO2, WO3, TiO2, CeO2, VO2, and V2O5, were integrated into coatings applied on Al and its alloys [13][14][15][16][17][18][19][20][21][22]. Among them, it was stated that the inclusion of V2O5 particles would be beneficial to boost the anticorrosive performance of Al alloys.…”

Section: Introductionmentioning

confidence: 99%

“…Among them, it was stated that the inclusion of V2O5 particles would be beneficial to boost the anticorrosive performance of Al alloys. For example, Kwon et al [21] documented that the introduction of V2O5 into the coating layer of Al alloy led to decreased porosity and enhanced electrochemical stability. These particles, being more electrochemically inert, create barriers against corrosive ions, thus impeding corrosion.…”

Section: Introductionmentioning

confidence: 99%

Electron Donor-Induced Electrochemical Reduction in Vanadate Anions to Enhance the Electrochemical Performance of Plasma Electrolytic Oxidation Layers

Kaseem,

Fattah-alhosseini,

Dikici

2024

Metals

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Despite the increasing interest in enhancing the electrochemical stability of Al alloys through protective coatings, the role of electron donor agents during coating formation remains poorly understood in terms of morphological control and anticorrosion properties in aqueous environments. In this context, 1H-Benzotriazole (BTA) was utilized as a proof of concept to regulate the in situ reactive integration of V2O5 into the alumina layer via the plasma electrolytic oxidation of a 6061 Al alloy. BTA played a crucial role in chemically incorporating V2O5 into the alumina coating by supplying electrons to VO3− ions, facilitating their reduction. The quantity of BTA added to the electrolyte was found to influence defect morphology and concurrently enhance the chemical incorporation of V2O5. Notably, corrosion measurements revealed that the less porous hybrid film formed with higher corrosion resistance was associated with the utilization of increased concentrations of BTA. These findings highlight the potential of BTA in modifying the structure and improving the ability of alumina coatings to resist corrosion, enabling advanced applications in protecting Al alloys from corrosion.

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“…Colorants are added into the PEO electrolyte to obtain coatings with a diversity of colors. [37][38][39][40][41] Among the colored coatings, the black coatings with high emissivity and high absorption are highly desired for the interior components of airships, especially for electronics house packaging for thermal control applications. [42][43][44] Salts of transition metals such as V and W are usually used as additives to fabricate black PEO coatings.…”

Section: Introductionmentioning

confidence: 99%

Fast formation of a black inner α‐Al₂O₃ layer doped with CuO on Al–Cu–Li alloy by soft sparking PEO process

Tian

et al. 2023

J Am Ceram Soc.

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Forming high‐temperature α‐Al2O3 phase under soft sparking is an intriguing phenomenon in plasma electrolytic oxidation (PEO) of Al alloys, which contradicts the low energy input of the process. In this study, α‐Al2O3 doped with black CuO is formed beneath an amorphous white outer layer on Al–Cu–Li alloy by PEO in a dilute silicate electrolyte under soft sparking. In comparison, reddish coatings with dominating γ‐Al2O3 are formed under the conventional plasma discharges, although blackish inner layer with α‐Al2O3 can also be exposed by heavily polishing the samples. In order to know the underlying mechanism, temperatures at the coating surface and the underlying substrate have been monitored by a thermocouple under the conventional and soft sparking PEO regimes, respectively. Interestingly, high temperatures are detected in the case of soft sparking rather than PEO with strong discharges. The formation of CuO, quartz, and cristobalite within the soft sparking coating also supports the existence of high temperature. Hence, the formation of α‐Al2O3 under soft sparking can be resolved to the conventional thermal activation mechanism, without the need of seeking other plausible explanations. Thermal condition evaluation for soft sparking PEO suggests that values of the effective thermal conductivity during PEO process for the outer layer and the barrier layer at the coating/substrate interface might be lower than ∼0.05 and ∼0.0017 W m−1 K−1, respectively. It is believed that the amorphous structure of the outer and barrier layers effectively blocks the heat dissipation, facilitating the formation of a highly wear‐resistant inner layer with α‐Al2O3, CuO, and the other high‐temperature species under soft sparking.

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Electrochemical response of VxOy-Al2O3 composite layer with dark-green color achieved by plasma electrolytic oxidation

Cited by 15 publications

References 38 publications

Optical Properties of Vanadium Oxide/Cellulose Triacetate Photochromic Films

Optical Properties of Vanadium Oxide/Cellulose Triacetate Photochromic Films

Electron Donor-Induced Electrochemical Reduction in Vanadate Anions to Enhance the Electrochemical Performance of Plasma Electrolytic Oxidation Layers

Fast formation of a black inner α‐Al₂O₃ layer doped with CuO on Al–Cu–Li alloy by soft sparking PEO process

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Electrochemical response of VxOy-Al2O3 composite layer with dark-green color achieved by plasma electrolytic oxidation

Cited by 15 publications

References 38 publications

Optical Properties of Vanadium Oxide/Cellulose Triacetate Photochromic Films

Optical Properties of Vanadium Oxide/Cellulose Triacetate Photochromic Films

Electron Donor-Induced Electrochemical Reduction in Vanadate Anions to Enhance the Electrochemical Performance of Plasma Electrolytic Oxidation Layers

Fast formation of a black inner α‐Al2O3 layer doped with CuO on Al–Cu–Li alloy by soft sparking PEO process

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Product

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Fast formation of a black inner α‐Al₂O₃ layer doped with CuO on Al–Cu–Li alloy by soft sparking PEO process