Untitled

Бобрикова, Ирина Георгиевна; Kukoz, F. I.; Селиванов, В. Н.; Kopin, A. V.

doi:10.1023/a:1020664022224

Cited by 7 publications

(7 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Electroplated binary Zn-M alloys, where M is an iron-group metal (Fe, Co or Ni), exhibit improved properties compared to pure Zn [2,3]. Zn-Ni coatings have been formed by DC plating [4][5][6][7][8][9][10][11][12][13][14], pulse plating [15], and as composition modulated alloys (CMA's) [16]. Zn-Co coatings have also been formed by DC plating [6,7,17,18], pulse plating [19], and as CMA's [20,21].…”

Section: Introductionmentioning

confidence: 99%

Electroplating and characterization of Zn–Ni, Zn–Co and Zn–Ni–Co alloys

Eliaz

Venkatakrishna

Hegde

2010

Surface and Coatings Technology

146

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Electroplating and characterization of Zn–Ni, Zn–Co and Zn–Ni–Co alloys

Eliaz

Venkatakrishna

Hegde

2010

Surface and Coatings Technology

146

View full text Add to dashboard Cite

“…The acid plating baths are based on solutions of chloride [2,5,8,10,[12][13][14][15][16][17][18][19][20][21][22][23][24] or sulfate salts [3,9,[25][26][27][28], or both [29,30]. These baths may contain electrolytes such as ammonium chloride or sulfate [8,12,16,24,27,28], boric acid [2,3,9,10,14,15,17,19,21,23,30,31], sodium [9,17] or potassium chloride [10,13,15,23,24], sodium acetate [10,…”

Section: Introductionmentioning

confidence: 99%

“…These baths may contain electrolytes such as ammonium chloride or sulfate [8,12,16,24,27,28], boric acid [2,3,9,10,14,15,17,19,21,23,30,31], sodium [9,17] or potassium chloride [10,13,15,23,24], sodium acetate [10,28], sodium citrate [3,9,27], etc.…”

Section: Introductionmentioning

confidence: 99%

ZnNi alloy electrodeposition from acid baths containing sorbitol or glycerol and characterization of ZnNi deposits

2009

View full text Add to dashboard Cite

The influence of sorbitol or glycerol on the electrodeposition of ZnNi alloys and on the morphology, composition and structure of the ZnNi deposits was investigated. The highest current efficiency (CE), around 90%, was obtained in the presence of glycerol in the potential range from approximately −1.30 V to −1.40 V, while in the presence of sorbitol or absence of either polyalcohol the CE was 82-85%, for the same potential range. Scanning electron microscopy (SEM) analysis showed that ZnNi deposition at −1.26 V or −1.40 V from a bath with sorbitol led to the formation of more compact deposits than with glycerol. Energy dispersive X-ray spectroscopy (EDS) analysis showed that the Ni content in the deposit obtained in the presence of sorbitol remained in the range of 7-9.5 wt% Ni, over a large range of deposition conditions. On the other hand, ZnNi deposits with variable Ni content (5.5-19.5 wt% Ni) were obtained from baths with glycerol or without either polyalcohol, by shifting the deposition potential. All ZnNi deposits showed uniform distribution of the elements Zn and Ni. X-ray analysis of ZnNi deposits obtained from plating baths with and without polyalcohol's at −1.26 and −1.40 V presented the γ, γ 1 and Pt 3 -Zn phases.

show abstract

“…The formation of this hydroxide film as a means of discharging Zn 2+ ions, however, hinders the discharge of Ni 2+ ions. 32 After the Zn-Ni codeposition, Ni starts acting as the site for H 2 evolution. This is because Ni offers a lower overvoltage than does Zn for this reaction.…”

Section: Resultsmentioning

confidence: 99%

Electrocodeposition of Nanocrystalline Single-Phase γ-Zn[sub 3]Ni Alloy on Composite Graphite

M.A.Tehrani

Ghani

2008

J. Electrochem. Soc.

View full text Add to dashboard Cite

The single-phase gamma zinc-nickel alloy ͑␥-Zn 3 Ni͒ nanocrystal was deposited on composite graphite electrode at a scan rate of 10,000 mV s −1 . The average particle size obtained was 11.8 Ϯ 3.1 nm. Transmission electron microscopy analysis indicated that codeposition applied potential, i.e., nucleation overpotential, scan rate, and codeposition time were critical on crystal sizing and Ni content in the matrix. Cyclic voltammetry and analysis of X-ray diffraction have also indicated that single-phase ͑␥-phase͒ alloy was, indeed, obtained at the scan rate used. The results also revealed that 19.0 wt % Ni nanoparticles were uniformly dispersed in the phase compositions of the alloy coating.Nanostructure materials with their unique and fascinating properties have prompted scientists to explore the possibilities of using them in industrial applications. For example, bimetallic thin films and nanoalloys, especially those with magnetic quality, could be used in storage systems, 1 superconductors, electrochromic materials, catalysts, and decorative and protective coatings. 2,3 Zinc is usually used as sacrificial anode, which provides cathodic protection to iron. However, this coating corrodes rapidly; hence, Zn-Ni alloy coating containing up to 12 wt % Ni 4 is used as the passivation agent to minimize this problem. Zn-Ni alloys exhibit a high protective function against corrosion, good mechanical properties, 5 and low hydrogen brittleness 6 as compared to pure zinc and galvanized steel. It has been widely applied as a highly corrosion-resistant coating, especially in steel mills and automotive and computer industries. 7-9 Zn-Ni alloy has a higher negative potential than cadmium and, hence, dissolves rapidly in corrosive environments. But, it is a good replacement for cadmium coating due to the latter's toxicity. 10 The electrodeposition of Zn-Ni alloy is classified as an anomalous type of codeposition. 11 In the electrodeposition, Zn, a thermodynamically less-noble metal than Ni, is preferentially deposited. The formal electrode potentials ͑E o ͒ for Zn 2+ /Zn and Ni 2+ /Ni pairs are −0.762 and −0.236 V, respectively. The alloy composition always has a greater abundance of zinc than of nickel. Higher Ni content leads to a more-positive open-circuit potential, which in turn reduces the motivation force for the galvanic corrosion. 10 The commonly employed Zn-Ni alloy in the aeronautical industry has 15-22 wt %. 12 Attempts to rationalize the anomalous electrodeposition of the Zn-Ni alloy are not quite successful. 13-15 One reason could be the favorable kinetic effect of Zn deposition as compared to Ni deposition. 13 The increase in pH near the cathode surface, followed by the formation of Zn hydroxide precipitate and the inhibition of Ni discharge, is also suggested. 14,15 In addition to this, the effects of organic additives on improved Ni content in the alloy composition are also investigated. 6,13 There are three intermetallic phases, i.e., ␥, , and ␦ based on Ni content, on the equilibrium-phase diagram for the Zn-Ni...

show abstract

Untitled

Cited by 7 publications

References 3 publications

Electroplating and characterization of Zn–Ni, Zn–Co and Zn–Ni–Co alloys

Electroplating and characterization of Zn–Ni, Zn–Co and Zn–Ni–Co alloys

ZnNi alloy electrodeposition from acid baths containing sorbitol or glycerol and characterization of ZnNi deposits

Electrocodeposition of Nanocrystalline Single-Phase γ-Zn[sub 3]Ni Alloy on Composite Graphite

Contact Info

Product

Resources

About