Cathodic Deposition of Zinc-Nickel Coatings from a Dilute Ammonium Chloride Electrolyte with a High Glycine Concentration

Keywords: electrodeposition, zinc-nickel coatings, ammine electrolyte, glycine, current efficiency, voltammetry.

Abstract

This study determined the kinetics of the synthesis, the chemical composition, and morphology of zinc-nickel coatings electrolytically obtained from low-concentration (0.04 М ZnCl2, 0.08 M NiCl2) ammiacate and ammonia-glycinate chloride solutions. Transient electrochemical methods (cyclic voltammetry and linear sweep voltammetry) allowed us to determine that the cathodic deposition of Zn–Ni alloy costings, regardless of the presence of glycine in the ammonium chloride electrolyte, is limited by the stage of diffusion mass-transfer of ions, whose electrochemical reduction (the charge transfer stage) is irreversible. The introduction of relatively high concentrations of glycine (0.3 М) in the electrolyte allows obtaining
smoother coatings, which is demonstrated by the results of scanning electron microscopy. At the same time, energy dispersive X-ray spectroscopy demonstrated that the atomic fraction of nickel in the potentiostatically deposited coating increases on average by 9.7%. It is possible that the alteration of the chemical composition results in a significant decrease (on average by ~15 %) in the current efficiency in electrolytes with glycine, since it catalyses the side reaction of hydrogen evolution.

 

 

 

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Author Biographies

Oleg A. Kozaderov, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

DSc in Chemistry, Associate
professor, Head of the Department of Physical
Chemistry, Faculty of Chemistry, Voronezh State
University, Voronezh, Russian Federation; e-mail:
ok@chem.vsu.ru.

Ksenia E. Tinaeva, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

student, Department of Physical
Chemistry, Faculty of Chemistry, Voronezh State University, Voronezh, Russian Federation; e-mail:
tinaeva.98@mail.ru.

Alina E. Tinaeva, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

student, Department of Physical
Chemistry, Faculty of Chemistry, Voronezh State
University, Voronezh, Russian Federation; e-mail: lina.tinaeva.98@mail.ru.

Dmitrii V. Burliaev, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

postgraduate student,
Department of Physical Chemistry, Faculty of
Chemistry, Voronezh State University, Voronezh,
Russian Federation; e-mail: dimn0@yandex.ru.

Published
2020-09-18
How to Cite
Kozaderov, O. A., Tinaeva, K. E., Tinaeva, A. E., & Burliaev, D. V. (2020). Cathodic Deposition of Zinc-Nickel Coatings from a Dilute Ammonium Chloride Electrolyte with a High Glycine Concentration. Kondensirovannye Sredy I Mezhfaznye Granitsy = Condensed Matter and Interphases, 22(3), 320-326. https://doi.org/10.17308/kcmf.2020.22/2962
Section
Статьи