Potassium salt based alkaline bath for deposition of Zn–Fe alloys

Lan, Chun-Kai; Liu, W.Y.; Ke, Simai; Chin, Tsung‐Shune

doi:10.1016/j.surfcoat.2006.06.027

Cited by 52 publications

(22 citation statements)

References 14 publications

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“…In other words, the reduction of Ni or Fe is inhibited while the deposition of Zn is enhanced when compared with their individual deposition rates. Several theories have been forwarded by various researchers, [15][16][17][18][19][20][21] but the most widespread one, and subject of controversy, is the so-called ''hydroxide suppression mechanism'' (HSM). This model, initially proposed by Dahms and Croll 15 for the Ni-Fe alloys, suggests that the discharge of more noble ions (i.e., Ni 2+ ) is hindered by the formation of Fe(OH) 2 in respective electrolytes, due to local pH rise, on the catalyst surface and, therefore, inhibits the codeposition of Ni.…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition behavior of zinc–nickel–iron alloys from sulfate bath

2008

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The present work is directed at collecting the properties of Zn-Ni and Zn-Fe alloys in one alloy via the electrodeposition of Zn-Ni-Fe ternary alloy. Electrodeposition of ternary Zn-Ni-Fe alloy was investigated and compared with the characteristics of Zn-Ni electrodeposits. The electrodeposition was performed from a sulfate bath onto a steel substrate. Structural analysis by X-ray diffraction (XRD) method revealed that the Zn-Ni-Fe alloys consisted of a mixture of zinc, and (c-Ni 2 Zn 11 ) and (Fe 3 Ni 2 ) phases.The study was carried out using electrochemical methods such as cyclic voltammetry and galvanostatic for electrodeposition, while anodic linear polarization resistance and anodic linear sweeping voltammetry techniques were used for the corrosion study. Surface morphology and chemical composition of the deposits were also examined by using scanning electron microscopy and atomic absorption spectroscopy, respectively. It was found that the obtained Zn-Ni-Fe alloy exhibited more preferred surface appearance and better corrosion resistance without adding any organic brighteners to the plating bath in comparison to Zn-Ni alloy that electrodeposited at similar conditions. Results obtained revealed that the increase in corrosion resistance of ternary deposits is not only attributed to the formation of (c-Ni 2 Zn 11 ) phase, but also to iron codeposition and formation of (Fe 3 Ni 2 ) phase.

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Section: Introductionmentioning

confidence: 99%

Electrodeposition behavior of zinc–nickel–iron alloys from sulfate bath

2008

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“…Although the cathodic efficiencies of the alkaline processes are low, they exhibit more uniform distribution of current and plated metal over the surface of cathodes within the applied current density range. [6][7][8] The employed electrolyte was prepared using p.a. grade chemicals (Merck) and double distilled water.…”

Section: Methodsmentioning

confidence: 99%

The effects of pulse plating variables on morphology and corrosion behavior of Zn–Fe alloy coatings

Roshanghias

Sohi

2010

J Coat Technol Res

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Considerable researches have been focused on zinc-iron (Zn-Fe) alloy coatings due to their superior characteristics among zinc alloy electrodeposits in recent years. The corrosion behavior of these coatings depends on the phase structure and morphology of the Zn-Fe deposits. In this work the effects of pulse plating variables such as current density, offtime, frequency and pulse modes on the morphology and phase structure of Zn-Fe deposits was studied by scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive spectrometry (EDS) analysis. The corrosion behavior of these coatings was measured by means of polarization curves and Neutral salt spray tests. It was shown that pulse reverse coatings exhibit excellent resistance to corrosion in comparison with normal pulse and direct current conditions.

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“…Despite its well known toxicity and the rigorous maintenance control to avoid environmental problems 19,20 , the traditional cyanide-containing alkaline baths are sometimes used for electroplating of Zn and Zn alloys. Following the general trends for the electrodeposition of alloy coatings, however, most of the current researches found in the literature deals with nontoxic or environmentally friend complexant agents and additives 2,7,8,[21][22][23][24] . Earlier, we have used a nontoxic citrate bath to produce Cu-Zn and Cu-Co alloy coatings on steel substrate 25,26 .…”

Section: Introductionmentioning

confidence: 99%