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<p>In the present work, a comparative case study was conducted on pulse-plated (Zn–Ni) coatings over mild steel (MS) from a modified citrate-watts bath and from ethaline-200 deep eutectic solvents (DES). Electrochemical studies (cyclic voltammetry and chronoamperometry) of the baths were carried out to provide insight into the nucleation and growth mechanisms occurring during the electroplating process. The obtained coating’s composition and morphology, topography, chemical composition and texture characteristics were evaluated by scanning electron microscopy (SEM), atomic force microscopy (AFM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) techniques, respectively. Moreover, the hardness, adhesion and tribological properties of the coatings were evaluated by nano-indentation, nano-scratch and ball on disc tester, respectively. The coating’s electrochemical behavior was evaluated by potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) techniques in 3.5&#xa0;wt.% NaCl solution simulating sea-water conditions. The plated Zn–Ni coating from DES exhibits ~ 82&#xa0;μm thickness, with a predominant γ–Ni<sub>2</sub>Zn<sub>11</sub> phase, which, in turn, displays higher hardness (~ 383 VHN) and corrosion rate (~ 0.66&#xa0;mmpy) values than those of Zn–Ni alloy coating (~ 298 VHN and ~ 1.09&#xa0;mmpy) obtained from aqueous-based electrolytes.</p> Graphical Abstract <p></p>

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Electrochemical performance of γ-Ni2Zn11 coatings synthesized from non-aqueous bath

  • 期刊论文

  • 发表日期：

    2025年11月6日

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  • Juan David Matallana Guerrero,
  • Pakanati Siva Prasad,
  • Anjali Kumari,
  • Bangmaya Satpathy,
  • Siddhartha Das,
  • Karabi Das

摘要

In the present work, a comparative case study was conducted on pulse-plated (Zn–Ni) coatings over mild steel (MS) from a modified citrate-watts bath and from ethaline-200 deep eutectic solvents (DES). Electrochemical studies (cyclic voltammetry and chronoamperometry) of the baths were carried out to provide insight into the nucleation and growth mechanisms occurring during the electroplating process. The obtained coating’s composition and morphology, topography, chemical composition and texture characteristics were evaluated by scanning electron microscopy (SEM), atomic force microscopy (AFM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) techniques, respectively. Moreover, the hardness, adhesion and tribological properties of the coatings were evaluated by nano-indentation, nano-scratch and ball on disc tester, respectively. The coating’s electrochemical behavior was evaluated by potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) techniques in 3.5 wt.% NaCl solution simulating sea-water conditions. The plated Zn–Ni coating from DES exhibits ~ 82 μm thickness, with a predominant γ–Ni2Zn11 phase, which, in turn, displays higher hardness (~ 383 VHN) and corrosion rate (~ 0.66 mmpy) values than those of Zn–Ni alloy coating (~ 298 VHN and ~ 1.09 mmpy) obtained from aqueous-based electrolytes.

Graphical Abstract