Effect of TiO2 Concentration on Microstructure and Properties of Composite Cu–Sn–TiO2 Coatings Obtained by Electrodeposition

Kasach, Aliaksandr A.; Kharitonov, D. S.; Paspelau, Andrei; Ryl, Jacek; Sergievich, Denis S.; Zharskii, I. M.; Курило, И. И.

doi:10.3390/ma14206179

Cited by 11 publications

(8 citation statements)

References 50 publications

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“…On the contrary, the presence of the CeO 2 and TiO 2 particles in the metallic matrix formed galvanic microcells, which increased the dissolution of the nickel matrix, resulting in the initiation of local corrosion. Similar worsening of corrosion properties of coating in presence of TiO 2 were discussed by Kasach et al [69]. For Ni-CeO 2 coating, which revealed almost similar corrosion resistance and degradation mechanisms as pure Ni in corrosion tests in 0.5 M NaCl solution, the air entrapped in the structures can also prevent the hydrophobic composite coating from being wetted by the corrosion medium through the limited solid contact area, and thus lower the corrosion rate [62].…”

Section: Physicochemical Propertiessupporting

confidence: 75%

Influence of CeO2 and TiO2 Particles on Physicochemical Properties of Composite Nickel Coatings Electrodeposited at Ambient Temperature

et al. 2022

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The Ni-TiO2 and Ni-CeO2 composite coatings with varying hydrophilic/hydrophobic characteristics were fabricated by the electrodeposition method from a tartrate electrolyte at ambient temperature. To meet the requirements of tight regulation by the European Chemicals Agency classifying H3BO3 as a substance of very high concern, Rochelle salt was utilized as a buffer solution instead. The novelty of this study was to implement a simple one-step galvanostatic electrodeposition from the low-temperature electrolyte based on a greener buffer compared to traditionally used, aiming to obtain new types of soft-matrix Ni, Ni-CeO2, and Ni-TiO2 coatings onto steel or copper substrates. The surface characteristics of electrodeposited nickel composites were evaluated by SEM, EDS, surface contact angle measurements, and XPS. Physiochemical properties of pure Ni, Ni-CeO2, and Ni-TiO2 composites, namely, wear resistance, microhardness, microroughness, and photocatalytic activity, were studied. Potentiodynamic polarization, EIS, and ICP-MS analyses were employed to study the long-term corrosion behavior of coatings in a 0.5 M NaCl solution. Superior photocatalytic degradation of methylene blue, 96.2% after 6 h of illumination, was achieved in the case of Ni-TiO2 composite, while no substantial change in the photocatalytic behavior of the Ni-CeO2 compared to pure Ni was observed. Both composites demonstrated higher hardness and wear resistance than pure Ni. This study investigates the feasibility of utilizing TiO2 as a photocatalytic hydrophilicity promoter in the fabrication of composite coatings for various applications.

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Section: Physicochemical Propertiessupporting

confidence: 75%

Influence of CeO2 and TiO2 Particles on Physicochemical Properties of Composite Nickel Coatings Electrodeposited at Ambient Temperature

et al. 2022

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“…In this media, a pronounced increase in the bulk pH with time was observed with an increase in the amount of Li in the alloys. This trend can be associated with the initiation of the corrosion process and the tendency of the alloy to corrode [53].…”

Section: Evolution Of Ph and Ocp At Initial Stages Of Corrosion In Ch...mentioning

confidence: 98%

Corrosion Inhibition of AZ31-xLi (x = 4, 8, 12) Magnesium Alloys in Sodium Chloride Solutions by Aqueous Molybdate

Osipenko,

Paspelau,

Kasach

et al. 2024

Preprint

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In this work, corrosion inhibition of lithium-containing AZ31 magnesium alloys AZ31-xLi (x = 4, 8, and 12 wt.%) has been examined in 0.05 M NaCl solution with and without 10–150 mM of sodium molybdate as the corrosion inhibitor. X-ray diffraction, scanning electron microscopy (SEM), and energy dispersive spectroscopy analyses have been used to investigate the phase composition and microstructure of the alloys. The effectiveness of the molybdate inhibitor has been evaluated by a set of electrochemical methods, including potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and dynamic electrochemical impedance spectroscopy (DEIS). Instantaneous DEIS measurements allowed to evaluate the effectiveness profile of sodium molybdate, giving high inhibition efficiency (>85%) at concentrations higher than ca. 35 mM. Post-corrosion SEM, Raman, and X-ray photoelectron spectroscopy analyses confirmed the morphology, ionic and valence composition of the formed passive layers on the surface of AZ31-xLi alloys. Based on experimental observations, a two-stage corrosion mechanism of AZ31-xLi alloys in molybdate-containing NaCl solutions has been proposed.

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“…The equivalent circuit consists of solution resistance (Rs), constant phase element (CPE), and polarization resistance (Rp). The impedance of the CPE element is calculated by [25][26][27]:…”

Section: The Effect Of Pulse Duty Cycle On Corrosion Resistance Of Gr...mentioning

confidence: 99%

Preparation and Properties of Pulsed Composite Coatings of Supercritical Graphene Quantum Dots

Lei

et al. 2022

Coatings

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Using graphene quantum dots with unique properties as the second phase additive and utilizing the high diffusion and transfer properties of supercritical fluids, Ni-based nanocomposite coatings were prepared by pulsed electrodeposition technology. The effects of the pulse duty cycle on the microstructure, mechanical properties, and corrosion resistance of composite coatings were investigated. The results showed that the graphene quantum dots are successfully embedded in the coatings, and under supercritical conditions, a suitable pulse duty cycle can improve the surface density and sphericity of the coatings. Raman spectroscopy and carbon-sulfur analyzer test indicated that supercritical conditions can improve the quality and content of graphene quantum dots in the coatings. The graphene quantum dots composite coating prepared when the pulse duty cycle is 0.3 has more excellent mechanical properties. Its microhardness is higher, and it has a smaller friction coefficient and wear scar cross-sectional area. Tafel polarization experiments indicated that under supercritical conditions, the corrosion current density of graphene quantum dots composite coating prepared when the pulse duty cycle is 0.3 is small, which is 1.286 × 10−5 A·cm−2. The 120 h immersion corrosion study showed that no obvious corrosion occurs on the surface. Therefore, its corrosion resistance is more excellent.

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Effect of TiO2 Concentration on Microstructure and Properties of Composite Cu–Sn–TiO2 Coatings Obtained by Electrodeposition

Cited by 11 publications

References 50 publications

Influence of CeO2 and TiO2 Particles on Physicochemical Properties of Composite Nickel Coatings Electrodeposited at Ambient Temperature

Influence of CeO2 and TiO2 Particles on Physicochemical Properties of Composite Nickel Coatings Electrodeposited at Ambient Temperature

Corrosion Inhibition of AZ31-xLi (x = 4, 8, 12) Magnesium Alloys in Sodium Chloride Solutions by Aqueous Molybdate

Preparation and Properties of Pulsed Composite Coatings of Supercritical Graphene Quantum Dots

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