Abstract
Electrodeposition of metals and alloys from aqueous solutions has been extensively studied in the literature. Recently, ionic liquids having only anions and cations (without solvent) have been used as electrodeposition baths of metals and alloys. Growth conditions may significantly affect the surface characteristics of coatings. In this study, Zn metal, Co metal and Zn-Co alloy-based electrodes were prepared on copper surfaces from ionic liquids solution consisting of stoichiometric 1:2 mixtures of choline chloride and ethylene glycol (Ethaline). The growth potentials of Zn (zinc), Co (cobalt) and Zn-Co (zinc-cobalt alloy) electrodes were analysed by cyclic voltammograms. Zn, Co and Zn-Co were electrodeposited independently on copper substrates using constant voltages and ionic liquid electrolytes containing the salt forms of these metals. The surface morphologies, compositions and structures of the synthesized coatings were investigated by scanning electron microscope, Fourier Transform Infrared spectrophotometer, X-ray Photoelectron Spectroscopy, Energy-Dispersive X-ray Spectroscopy and X-ray Diffractometer. The coatings made of cobalt and zinc contained nanoflakes and hexagonal nano-layers, respectively. The smooth copper surfaces were evenly coated by these nanostructured thin film coatings. The nano and micro sized Co-Zn alloy particles electrodeposited from ionic liquid were observed to be agglomerated. The corrosion behaviour of Zn, Co and Zn-Co alloys was measured in 3.5% NaCl environment, using the Tafel method. The electrodeposition of the Zn-Co alloy resulted in higher corrosion resistances. While the Icorr (corrosion current) value of bare copper electrode was 40.7 μA cm−2, the Icorr value of Zn-Co electrochemically coated on copper was determined as 1.26 μA cm−2. These findings indicated that the corrosion resistivity of the Co-Zn alloy coating was more than 30 times greater than that of uncoated copper.
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Acknowledgments
PYE thanks the Council of Higher Education (YOK) in Turkey for 100/2000 PhD scholarship. This work was supported by Gaziantep University, BAP (FEF.DT.19.40).
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Yavuz, A., Yilmaz Erdogan, P., Zengin, H. et al. Electrodeposition and Characterisation of Zn-Co Alloys from Ionic Liquids on Copper. J. Electron. Mater. 51, 5253–5261 (2022). https://doi.org/10.1007/s11664-022-09756-8
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DOI: https://doi.org/10.1007/s11664-022-09756-8