Optimization of operational parameters and bath control for electrodeposion of Ni-Mo-B amorphous alloys

Marinho, Fabiano A.; Santana, François Sandini Marques De; Vasconcelos, André L. S.; Santana, Renato Alexandre Costa de; Prasad, Shiva

doi:10.1590/s0103-50532002000400018

Cited by 18 publications

(14 citation statements)

References 15 publications

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“…One reasonable explanation for this case is that a higher concentration of Fe ions inhibits the formation of Mo (IV) oxide and that Mo (VI) is reduced directly to molybdenum in alloy form, i.e., Fe(II) lowers the deposition rate of molybdenum. 17,24 The voltammetric curves in the 1:10 Fe-Mo ratio solution showed no characteristic oxidation peaks. At a 10:1 ratio, a well-defined anodic peak is visible at -0.27 V, which is attributed to Fe dissolution.…”

Section: Influence Of the Metal Concentrationmentioning

confidence: 98%

“…12,13 Hence, it is possible to induce the co-deposition of Mo with Fe-group metals. [14][15][16][17][18][19] The Co-Mo system is an example of induced co-deposition. An investigation of its induced discharge process is essential to correlate the coating properties with conditions of electrodeposition.…”

Section: Introductionmentioning

confidence: 99%

“…17,24 These phenomena are described by a mathematical model, which assumes that iron-group species can become adsorbed on the electrode surface, competing with the intermediate molybdenum for free surface sites. Thus, the partially diminished current density of Mo in Fe-containing electrolytes can be explained by a blocking mechanism caused by the adsorbed intermediate Fe.…”

Section: Introductionmentioning

confidence: 99%

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Electrodeposition of Ni-Mo and Fe-Mo alloys from sulfate-citrate acid solutions

Sanches¹,

Domingues²,

Carubelli³

et al. 2003

J. Braz. Chem. Soc.

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This paper reports on a study of the electrodeposition of Ni-Mo and Fe-Mo alloys on Pt electrodes in a sodium citrate solution at pH 4.0. The alloys were subjected to cyclic voltammetry at different ion concentration ratios to identify their behavior. The electrodeposited coatings were analyzed by SEM, EDX and XRD. The results of the cyclic voltammetry tests indicated the presence of dissolution peaks only with high Ni or Fe ion concentrations. The SEM analysis revealed that the two alloys had dissimilar morphologies and the Ni-Mo alloys were homogeneous and thick. The Mo and O contents were higher in the Ni-Mo than in the Fe-Mo alloys. Anomalous deposition was found to occur in the co-deposition of Ni and Mo.

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Section: Influence Of the Metal Concentrationmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrodeposition of Ni-Mo and Fe-Mo alloys from sulfate-citrate acid solutions

Sanches¹,

Domingues²,

Carubelli³

et al. 2003

J. Braz. Chem. Soc.

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“…[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.…”

Section: Introductionmentioning

confidence: 99%

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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“…O objetivo principal da MSR é determinar as condições ótimas de operação para um sistema ou determinar uma região que satisfaça as especificações operacionais 13 . Para dar continuidade aos trabalhos que estão sendo desenvolvidos no Laboratório de Eletroquímica e Eletroanalítica da Universidade Federal de Campina Grande [14][15][16][17] , este trabalho deu ênfase ao processo de otimização do banho eletrolítico para eletrodeposição da liga de Fe-W-B em função da sua eficiência de deposição e resistência à corrosão . Foi usada a metodologia de superfície de resposta para auxiliar no processo de otimização.…”

Section: Introductionunclassified

Otimização do banho eletrolítico da liga Fe-W-B resistente à corrosão

Santana¹,

Campos²,

Prasad³

et al. 2007

Quím. Nova

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Recebido em 2/2/06; aceito em 12/6/06; publicado na web em 28/11/06 OPTIMIZATION OF THE ELECTROLYTIC BATH FOR ELECTRODEPOSITION OF CORROSION RESISTANT Fe-W-B ALLOYS. A study on optimization of bath parameters for electrodeposition of Fe-W-B alloys from plating baths containing ammonia and citrate is reported. A 2 3 full factorial design was successfully employed for experimental design analysis of the results. The corrosion resistance and amorphous character were evaluated. The bath conditions obtained for depositing the alloy with good corrosion resistance were: 0.01 M iron sulfate, 0.10 M sodium tungstate and 0.60 M ammonium citrate. The alloy was deposited at 12% current efficiency. The alloy obtained had Ecorr -0.841 V and Rp 1.463 x 10 4 Ohm cm 2 . The deposit obtained under these conditions had an amorphous character and no microcracks were observed on its surface. Besides this, the bath conditions obtained for depositing the alloy with the highest deposition efficiency were: 0.09 M iron sulfate, 0.30 M sodium tungstate and 0.50 M ammonium citrate. The alloy was deposited at 50% current efficiency, with an average composition of 34 wt% W, 66 wt% Fe and traces of boron. The alloy obtained had Ecorr -0.800 V and Rp 1.895 x 10 3 Ohm cm 2 . Electrochemical corrosion tests verified that the Fe-W-B alloy deposited under both conditions had better corrosion resistance than Fe-Mo-B.Keywords: Fe-W-B alloy; electrodeposition; corrosion resistance. INTRODUÇÃOOs revestimentos protetores, além de constituírem uma importante forma de prevenção à corrosão metálica, principalmente a atmosférica, podem melhorar consideravelmente as propriedades fí-sico-químicas das superfícies. Os revestimentos mais comuns são os de cobre, níquel e cromo 1 . A eletrodeposição representa uma boa maneira de revestir as superfícies metálicas 2,3 ; uma das aplicações industriais mais importantes da eletrodeposição é o revestimento com finalidade de inibir a corrosão, que ocorre na superfície do metal e nas suas estruturas sob influência do meio ambiente 4,5 . O termo "codeposição induzida" foi apresentado por Brenner para descrever uma situação em que um metal não pode ser eletrodepositado a partir de solução aquosa na sua forma pura e sim, codepositado na presença de outro metal, formando dessa forma uma liga 6 . Um exemplo de codeposição induzida são as ligas de W com os elementos Ni, Co, e Fe 7,8 . Muitos autores investigaram o processo de eletrodeposição do tungstênio com os metais do grupo do ferro em soluções aquosas 9,10 . O metal tungstênio e suas ligas são utilizados em situações que necessitam de altas temperaturas. O tungstênio apresenta as seguintes propriedades: alta resistência à corrosão, dureza, mesmo em temperaturas elevadas, baixo coeficiente de dilatação, alta condutividade térmica, além de não ser atacado por nenhum ácido mineral à temperatura ambiente 11 e forma ligas duras com o cobalto, retendo algumas de suas propriedades incomuns 1 . O planejamento fatorial experimental apresenta muitas vantagens sobre os métodos univa...

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Optimization of operational parameters and bath control for electrodeposion of Ni-Mo-B amorphous alloys

Cited by 18 publications

References 15 publications

Electrodeposition of Ni-Mo and Fe-Mo alloys from sulfate-citrate acid solutions

Electrodeposition of Ni-Mo and Fe-Mo alloys from sulfate-citrate acid solutions

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

Otimização do banho eletrolítico da liga Fe-W-B resistente à corrosão

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