The influence of organic additives on the electrodeposition of iron-group metals and binary alloy from sulfate electrolyte

Lallemand, Fabrice; Ricq, Laurence; Wéry, M.; Berçot, P.; Pagetti, J.

doi:10.1016/j.apsusc.2004.01.027

Cited by 31 publications

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“…It is well known that additives which are often organic compounds yield deposits with suitable properties. Organic compounds containing oxygen, sulphur and nitrogen are among the most widely used additives in modern electroplating [3,[12][13][14][15]. These compounds can adsorb on the growing deposits or on the substrate with an impact on deposit properties and the electroplating process.…”

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confidence: 99%

Effects of thiourea and urea on zinc–cobalt electrodeposition under continuous current

2007

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The effect of thiourea and urea on zinc-cobalt alloys obtained from chloride baths under continuous current deposition are described and discussed. The deposit morphology was analyzed using Scanning Electron Microscopy (SEM) and an X-Ray Diffraction (XRD) was used to determine the preferred crystallographic orientations of the deposits. The use of additives does not refine the grain size of the Zn-Co alloy and an especially porous alloy was produced in the presence of urea. The preferred crystallographic orientations of zinc-cobalt alloys do not change in the presence additives. Zinc-cobalt alloys were without texture in the presence and absence of additives. Also, in the absence of additive and in the presence of urea, the XRD lines of the Zn-Co alloys are slightly shifted with respect to the pure zinc XRD lines, whereas, in the presence of thiourea, the XRD lines are not shifted. The alloy composition was examined using Energy Dispersive X-ray Fluorescence Spectroscopy (EDXRF). The percentage of cobalt in the alloy decreases slightly from 1.04 to 0.91 wt.% in the presence of urea and in the presence of thiourea it increases from 1.04 to 7.70 wt.%. Voltammetric studies show that thiourea increases the reduction rate of cobalt. This explains the increase in cobalt percentage in the alloy in the presence of thiourea.

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Section: Introductionmentioning

confidence: 99%

Effects of thiourea and urea on zinc–cobalt electrodeposition under continuous current

2007

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“…Ferromagnetic alloys, e.g., Fe-Co and Fe-Ni have received considerable attention for their practical applicability in modern industries, such as rocketry, computers, space technology, etc. 6,[14][15][16][18][19][20][21][22][23] Myung and Nobe 18 detected that the corrosion resistance of Fe-Co alloys were an order of magnitude lower than Fe-Ni and Co-Ni. On the other hand, the same authors determined the substantial increase in corrosion resistance by addition of Ni to Fe-Co deposits and the slight effect on this parameter with addition of B. Lallemand et al 20 observed that the codeposition of cobalt and iron leads to a reduction of the reaction rate of the more noble component and an increase of the reaction rate of the less noble component even if organic additives are adsorbed on the electrode surface, and affecting the polarization curves of single metals.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the same authors determined the substantial increase in corrosion resistance by addition of Ni to Fe-Co deposits and the slight effect on this parameter with addition of B. Lallemand et al 20 observed that the codeposition of cobalt and iron leads to a reduction of the reaction rate of the more noble component and an increase of the reaction rate of the less noble component even if organic additives are adsorbed on the electrode surface, and affecting the polarization curves of single metals. 23 Based on attractive soft magnetic properties and large magnetic inductions, Fe-Co alloys exhibit the largest magnetic induction of any material. [24][25][26] At high temperatures, such as 998 K, metallurgical alloys near the equiatomic composition undergo changes in structure from α-bcc to α´-CsCl-type structure.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of electrodeposited iron + cobalt thin films from a chloride bath

Correia¹,

Oliveira²,

Lima‐Neto³

2006

J. Braz. Chem. Soc.

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Ligas Fe-Co foram depositadas e dissolvidas em solução contendo íons metálicos e em solução de NH 4 Cl. Resultados voltamétricos sugerem interação entre os componentes da liga, originando uma solução sólida. Perfis de ALSV apresentam diferenciação para o processo de dissolução dos metais individuais e das ligas, com comportamento semelhante ao observado para cobalto e/ou ferro, com deslocamento de potencial para valores mais positivos à medida que aumenta o teor de cobalto no banho. A análise adimensional dos transientes potenciostáticos para cobalto, ferro e FeCo 1:1 e 1:10 indica processo de nucleação progressiva; já Fe-Co 1:5 segue a curva teórica para nucleação instantânea. A caracterização química e física dos eletrodepósitos mostra dependência entre a morfologia superficial e a composição do banho eletrolítico. Além disto, análises por EDX sugerem que a composição química dos eletrodepósitos foi sempre correspondente à composição do banho eletrolítico. Desta forma, é possível classificar estes processos como deposição regular.Fe-Co alloys were deposited and dissolved in the solution containing metallic ions and in the NH 4 Cl solution. Voltammetric results suggest interaction between the alloy components, constituting a solid solution. ALSV profiles show a differentiation for the dissolution process of the individual metals and alloys, with potentials displacement in the dissolution processes for more and more positive values, as the proportion of cobalt increases in the bath. The nondimensional analyses of the potentiostatic transients for the cobalt, iron and Fe-Co 1:1 and 1:10 suggest a progressive nucleation. However, Fe-Co 1:5 allowed instantaneous nucleation. The chemical and physical characterization of the electrodeposits showed dependence between the surface morphology and the composition of the electrolytic bath. Besides, EDX analyses showed that the composition of the electrodeposits were always corresponding the chemical composition of the electrolytic bath. In this way, it was possible to classify these processes as regular deposition. Keywords: electrodeposition, anodic dissolution, Fe-Co thin films IntroductionThe electrodeposition of alloys is a process much more complex than the electrodeposition of pure metals and several binary alloys systems have been investigated and reviewed. [1][2][3][4][5][6][7][8][9][10][11][12] Moreover, only few alloys systems have been industrially applied because an adequate control of these complex processes is naturally required in order obtaining a correct understanding of mechanisms. Electrodeposited alloys have potential applications for magnetic shielding, memory devices for computers and recording tapes, for corrosion protection and for electrocatalysis.Nowadays, the determination of alloy phase structure has been carried out using electrochemical techniques, such as galvanostatic and potentiostatic techniques, and, in most cases, anodic linear sweep voltammetry. 13 Literature on the electrodeposition of alloys of the iron group metals (Ni, Fe, Co and Zn...

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“…Thus, organic additives were shown to play an important role in iron electroplating. 4 Organic additives affect the polarization curves of metals and can improve surface characteristics such as brightness, leveling, and anticorrosion properties.…”

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Kinetics study and influence of water-soluble polymer on the electrodeposition of iron from a citrate-chloride electrolyte on the basis of Fe(III)

Protsenko¹,

Данилов²

2015

Turk J Chem

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Abstract:The kinetics of the iron electrodeposition reaction from a plating bath containing trivalent iron ions is investigated in the present work. The electrochemical reaction is stated to proceed via the formation of relatively stable intermediates: Fe(II) ions. Only a part of the total amount of Fe(II) ions formed at the first stage of Fe(III) discharge is reduced further, producing metal iron. The effect of polyhexamethyleneguanidine hydrochloride (with an average molecular weight of 1000) on the iron deposition is ascertained. The presence of polymer additive in the iron electrolyte appreciably affects the rate of iron deposition, while the polymer additive does not influence the rate of Fe(III) ions discharge. The effect of polyhexamethyleneguanidine on the rate of iron electrodeposition is discussed in terms of the influence of the oligomer on the aggregative stability of the Fe(OH) 3 sol formed in the near-electrode layer.

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The influence of organic additives on the electrodeposition of iron-group metals and binary alloy from sulfate electrolyte

Cited by 31 publications

References 24 publications

Effects of thiourea and urea on zinc–cobalt electrodeposition under continuous current

Effects of thiourea and urea on zinc–cobalt electrodeposition under continuous current

Preparation and characterization of electrodeposited iron + cobalt thin films from a chloride bath

Kinetics study and influence of water-soluble polymer on the electrodeposition of iron from a citrate-chloride electrolyte on the basis of Fe(III)

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