Influence of Zn–Ni alloy electrodeposition techniques on the coating corrosion behaviour in chloride solution

Hammami, Olfa; Dhouibi, L.; Triki, E.

doi:10.1016/j.surfcoat.2009.02.129

Cited by 62 publications

(38 citation statements)

References 15 publications

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“…The height of the peaks gives an indication about the quantity of its phase in deposits [10]. It should be mentioned that the height of the anodic peak a1′ of the Zn dissolution is larger than that of the anodic peak a1 of Zn-Ni alloy dissolution.…”

Section: Cyclic Voltammetrymentioning

confidence: 99%

“…It is reported that the corrosion resistance of Zn-Ni alloy coatings with 8 to 14 wt.% of nickel and single gamma phase structure is five times higher than that of pure Zn coatings [9]. Hammami et al [10] have demonstrated the increase in corrosion resistance with deposits electrodeposited under chronopotentiometry conditions (18.32 mA/cm 2 and 36.63 mA/cm 2 ). Mosavat et al [11] have revealed that the Ni content was a major factor to the corrosion resistance of deposits.…”

Section: Introductionmentioning

confidence: 99%

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Electrodeposition of nanocrystalline Zn–Ni coatings with single gamma phase from an alkaline bath

Feng

Zhang

et al. 2015

Surface and Coatings Technology

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Section: Cyclic Voltammetrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrodeposition of nanocrystalline Zn–Ni coatings with single gamma phase from an alkaline bath

Feng

Zhang

et al. 2015

Surface and Coatings Technology

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“…Generally, the first semicircle (higher frequencies) is relate to charge transfer associated with ionic double layer capacitance, while the second semicircle (lower frequencies) may be attributed to the resistance of porous corrosion product layer. 29,47 Obviously, the diameter of the capacitive loop increases with the decrease of the applied potential from −1.80 V to −2.05 V. The value of R 1 increases from 140.5 · cm 2 to 214.3 · cm, 2 whereas the value of R 2 increases from 525.3 · cm 2 to 576.9 · cm. 2 Thus, the reduction in corrosion rate occurs with the decrease of the applied potential.…”

Section: Resultsmentioning

confidence: 96%

“…Similar behavior was also seen in the literature. 29 Fig . 2b shows the cyclic voltammograms of Zn-Ni alloys obtained at various reversal potentials.…”

Section: Resultsmentioning

confidence: 99%

“…The potential of Zn-Ni alloys is more negative compared to the steel, indicating that Zn-Ni coatings can offer protection for ferrous substrates. 29 Moreover, the corrosion potentials of Zn-Ni alloys start to increase and then stabilize close to a stable value due to dezincification. 46 No much fluctuation of the corrosion potential in Zn-Ni alloys is observed in the experiment, suggesting a high protection of Zn-Ni alloy coatings.…”

Section: Resultsmentioning

confidence: 99%

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Electrochemical Behaviors and Properties of Zn-Ni Alloys Obtained from Alkaline Non-Cyanide Bath Using 5,5^′-Dimethylhydantoin as Complexing Agent

Feng

Zhang

et al. 2015

J. Electrochem. Soc.

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Zn-Ni alloys were prepared in an alkaline bath with 5,5 -dimethylhydantoin (DMH) and Na 4 P 2 O 7 · 10H 2 O as the complexing agents. The electrochemical behaviors of Zn-Ni alloy and Zn only on Pt and glassy carbon (GC) electrodes were investigated by cyclic voltammetry (CV), chromoamperometry (CA) and cathode polarization. Results show that DMH is the main complexing agent in the bath. Different behaviors of CV curves on Pt and GC electrodes were observed. The effects of Ni 2+ /Zn 2+ ratio and bath temperature on CV curves were investigated. The transfer coefficient (α) and diffusion coefficient (D) were also calculated. The nucleation growth processes of Zn-Ni alloy and Zn only show an agreement with three-dimensional progressive growth. Zn-Ni alloy coatings were also characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). The morphology of deposits is rectangular pyramid. The grain size decreases with the extension of the electrodepositing time and the decrease in the deposition potential can also lead to the decrease of grain size in deposits. The phase structure changes from the mixture of η and γ phases to single γ phase with (411) Zn-Ni alloy coatings are widely used to provide good protection for steel as replacements for Cd coatings in anticorrosion applications. 1,2They also have attracted great interests in relatively aggressive environment, i.e. high temperatures and severe oxidizing conditions.3 It has been reported that the processes of Zn-Ni alloy deposition can be divided into two types, the acid type and alkaline type. Most of Zn-Ni alloys are electrodeposited from the acid bath, 4,5 which displays a higher current density but poor distribution of the plated metal. However, the commercial alkaline bath used for Zn-Ni alloy deposition contains cyanide, which is toxic and carcinogenic to human health. In recent years, many attempts were done to investigate the alkaline non-cyanide bath and a number of complexing agents, such as tartrate, 6 sodium acetate, 7,8 amine, 9 triethanolamine, 10 glycinate, 11,12 ethylenediamine, 13 citrate and urea have been proposed. Among them, most of the complexing agents are used to complex Ni 2+ in the alkaline zincate bath which has a relatively low current efficiency and few effects have focused on investigating the alkaline non-zincate electrolyte due to its poor stability. Therefore, it is very urgent to find an alkaline non-zincate bath with high current efficiency and good stability to replace the cyanide bath.It is expensive and time-consuming to study a new complexing agent. Our research group has successfully used 5,5 -dimethylhydantoin (DMH) as the main complexing agent to electrodeposit Au, 14 Ag, 15 and Cu 16 in alkaline non-cyanide bath. According to their results, it can be concluded that DMH mainly has two different roles in metal electrodeposition. One is to complex the metal ions and the other is to adsorb on surface of the cathode. It is pos...

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Effect of diethanolamine and triethanolamine on the properties of electroplated Zn–Ni alloy coatings from acid bath

Hammami

Dhouibi²,

Berçot

et al. 2012

Can J Chem Eng

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Influence of Zn–Ni alloy electrodeposition techniques on the coating corrosion behaviour in chloride solution

Cited by 62 publications

References 15 publications

Electrodeposition of nanocrystalline Zn–Ni coatings with single gamma phase from an alkaline bath

Electrodeposition of nanocrystalline Zn–Ni coatings with single gamma phase from an alkaline bath

Electrochemical Behaviors and Properties of Zn-Ni Alloys Obtained from Alkaline Non-Cyanide Bath Using 5,5^′-Dimethylhydantoin as Complexing Agent

Effect of diethanolamine and triethanolamine on the properties of electroplated Zn–Ni alloy coatings from acid bath

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Influence of Zn–Ni alloy electrodeposition techniques on the coating corrosion behaviour in chloride solution

Cited by 62 publications

References 15 publications

Electrodeposition of nanocrystalline Zn–Ni coatings with single gamma phase from an alkaline bath

Electrodeposition of nanocrystalline Zn–Ni coatings with single gamma phase from an alkaline bath

Electrochemical Behaviors and Properties of Zn-Ni Alloys Obtained from Alkaline Non-Cyanide Bath Using 5,5′-Dimethylhydantoin as Complexing Agent

Effect of diethanolamine and triethanolamine on the properties of electroplated Zn–Ni alloy coatings from acid bath

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Electrochemical Behaviors and Properties of Zn-Ni Alloys Obtained from Alkaline Non-Cyanide Bath Using 5,5^′-Dimethylhydantoin as Complexing Agent