Технолошки факултет [Научни радови] / Faculty of Technology [Scientific papers]

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https://repozitorijum.ues.rs.ba/handle/123456789/40

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Прегледај Технолошки факултет [Научни радови] / Faculty of Technology [Scientific papers] по Аутор "BAJAT, JELENA B."

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    Ternary Zn–Ni–Co alloy: anomalous codeposition and corrosion stability
    (Serbian Chemical Society, 2015) TOMIĆ, MILORAD V.; PETROVIĆ, MILOŠ M.; STANKOVIĆ, SLAVKA; STEVANOVIĆ, SANJA I.; BAJAT, JELENA B.
    Electrochemically deposited Zn–Ni–Co alloys under various deposition conditions were investigated using atomic absorption spectroscopy for the determination of the chemical composition, atomic force microscopy for surface morphology analysis, and electrochemical impedance spectroscopy for determination of corrosion properties. The influence of the ratio of the alloying elements, [Co2+]/[Ni2+], in a chloride deposition solution, as well as the deposition current density, on the chemical content, morphology and corrosion properties of the ternary alloys was studied. The plating solutions used were with the same overall metal concentration, free of additives and the deposition was realized at room temperature. It was shown that the deposition of the ternary alloy coatings was of anomalous type and that the ratio of nickel to cobalt ions in the plating solution, as well as the deposition current density, had a significant influence on the chemical composition and corrosion stability of these coatings. The presence of both Ni and Co was beneficial for their corrosion stability. It was shown that morphology and porosity were important factors in the corrosion stability of these coatings. The coating deposited from the solution with higher [Co2+]/[Ni2+] ratio at 8 A dm-2 was made up of the smallest crystalline aggregates, had a small surface roughness and porosity, and was with quite uniform distribution of agglomerates and it exhibited the best corrosion stability.
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    The importance of using hydrogen evolution inhibitor during the Zn and Zn–Mn electrodeposition from ethaline
    (Serbian Chemical Society, 2019) BUČKO, MIHAEL; TOMIĆ, MILORAD V.; MAKSIMOVIĆ, MIODRAG; BAJAT, JELENA B.
    Cyclic voltammetry was used for the characterization of zinc electrodeposition on steel from ethaline deep eutectic solution (1:2 choline chloride: ethylene glycol). The influence of 4-hydroxy-benzaldehyde (HBA) as an additive was analyzed. It was shown that hydrogen evolution is inhibited in the presence of HBA and further significantly retarded upon addition of Zn2+ to the solution containing HBA. The cathodic peak for Zn2+ reduction in this type of ionic liquid (ethaline+HBA+Zn2+) resembles the zinc reduction in aqueous solution. The corrosion resistance of Zn coatings deposited at different current densities was evaluated by electrochemical methods, i.e., polarization measurements and electrochemical impedance spectroscopy in 3 % NaCl solution. The possibility of Zn–Mn alloy deposition from ethaline deep eutectic solvent was investigated for the first time. In addition, the corrosion stability of these alloy coatings was analyzed and compared to the stability of bare Zn coatings. It was shown that the optimum deposition current density for both Zn and Zn–Mn coatings with increased corrosion stability from ethaline + HBA electrolyte is 5 mA cm˗2.