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AbstractAbstract
[en] Niobium electrodeposition from molten alkali fluorides has been studied aiming the application of this technic to the processes of electrorefining and galvanotechnic of this metal. The effects of current density, temperature, niobium concentration in the bath, electrolysis time, substrate nature, ratio between anodic and cathodic areas, electrodes separation and the purity of anodes were investigated in relation to the cathodic current efficiency, electrorefining, electroplating and properties of the deposit and the electrolytic solution. The work also gives the results of the conctruction and operation of a pilot plant for refractory metals electrodeposition and shows the electrorefining and electroplating compared to those obtained at the laboratory scale. (author)
[pt]
A eletrodeposicao de niobio, em meio de fluoretos alcalinos fundidos, foi estudada com finalidade de aplicacao desta tecnica nos processos de eletrorefino e galvanotecnico deste metal. Os efeitos da densidade de corrente, temperatura, concentracao de niobio no banho, tempo de duracao da eletrolise, natureza do substrato, razao entre area anodica e area catodica, distancia entre eletrodo e pureza dos anodos foram investigados com relacao a eficiencia de corrente catodica, eletrorefino, electrorecobrimentos e propriedades dos depositos e da solucao eletrolitica. O trabalho apresenta tambem os resultados de construcao e operacao de uma planta piloto de eletrodeposicao de metais refratarios e exibe dados sobre o eletrorefino em comparacao com aqueles obtidos a nivel de laboratorio. (autor)Original Title
Eletrodeposicao de niobio em meio de fluoretos fundidos
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Source
1987; 185 p; Tese (Ph.D.).
Record Type
Miscellaneous
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Thesis/Dissertation
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