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Journal of Electrochemical Science and Engineering, Vol. 13 No. 6, 2023.

Original scientific paper

https://doi.org/10.5599/jese.1895

Electrodeposition of zinc-nickel alloys from ethylene glycol-based electrolytes in presence of additives for corrosion protection

Negar Fouladvari ; Dipartimento di Chimica, Materiali e Ingegneria Chimica Giulio Natta, Via Mancinelli 7, 20131, Milano, Italy
Gozde Firtin ; Dipartimento di Chimica, Materiali e Ingegneria Chimica Giulio Natta, Via Mancinelli 7, 20131, Milano, Italy
Buse Kahyaoglu ; Dipartimento di Chimica, Materiali e Ingegneria Chimica Giulio Natta, Via Mancinelli 7, 20131, Milano, Italy
Luca Nobili ; Dipartimento di Chimica, Materiali e Ingegneria Chimica Giulio Natta, Via Mancinelli 7, 20131, Milano, Italy
Roberto Bernasconi ; Dipartimento di Chimica, Materiali e Ingegneria Chimica Giulio Natta, Via Mancinelli 7, 20131, Milano, Italy *

* Corresponding author.

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Abstract

In the present work the electrodeposition of zinc-nickel alloys with 15-20 wt.% nickel from non-aqueous solutions based on ethylene glycol is investigated. Potentiostatic deposition conditions are used, which are found to offer optimal coating quality and superior control over composition. In addition, ammonium chloride is evaluated as additive to partially suppress nickel incorporation into the deposit and to enhance layer quality. Layers composition, surface morphology of the deposits and their anticorrosive properties are investigated. The electrochemical characteristics of the Zn-Ni electrolytes are studied using cyclic voltammetry measurements. From the phase composition point view, X-ray diffraction results confirm that a metastable γ phase is present in the as deposited Zn-Ni alloys with nickel content 16-18 wt.%. Corrosion tests show that the barrier behaviour against corrosion of Zn-Ni films electrodeposited from the NH4Cl containing bath is superior in comparison to layers plated from an additive-free bath. The use of the additive enlarges the grains and provides a compact surface structure, which upskills the anticorrosive behaviour of the deposit.

Keywords

Plating; non-aqueous solvent; ammonium chloride; anticorrosion coating

Hrčak ID:

311017

URI

https://hrcak.srce.hr/311017

Publication date:

7.12.2023.

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