Bernasconi R, Panzeri G, Firtin G, Kahyaoglu B, Nobili L, Magagnin L. Electrodeposition of ZnNi Alloys from Choline Chloride/Ethylene Glycol Deep Eutectic Solvent and Pure Ethylene Glycol for Corrosion Protection.
J Phys Chem B 2020;
124:10739-10751. [PMID:
33174746 PMCID:
PMC7735728 DOI:
10.1021/acs.jpcb.0c04784]
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Abstract
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The present work follows the trend
to develop non-aqueous electrolytes
for the deposition of corrosion resistant ZnNi alloys. It investigates
the use of the choline chloride/ethylene glycol (1:2 molar ratio)
eutectic mixture and of pure ethylene glycol as solvents for ZnNi
electroplating. The electrochemical behavior of Zn and Ni is investigated
via cyclic voltammetry, and potentiostatic ZnNi deposition is performed.
Ni content is found to be precisely tunable in the 10–20% wt
range, which presents the highest industrial interest for corrosion
protection. ZnNi coatings obtained are characterized from the morphological
and phase composition point of view. Evidence of the formation of
a metastable γ ZnNi phase is observed for both choline chloride/ethylene
glycol and pure ethylene glycol. Finally, potentiodynamic corrosion
tests are performed to assess their corrosion properties.
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