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Mater Sci Eng C Mater Biol Appl ; 42: 529-37, 2014 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-25063150

RESUMO

The work presents results of the studies performed on electropolishing of pure niobium in a bath that contained: sulphuric acid, hydrofluoric acid, ethylene glycol and acetanilide. After the electropolishing, the specimens were subjected to anodic passivation in a 1moldm(-3) phosphoric acid solution at various voltages. The surface morphology, thickness, roughness and chemical composition of the resulting oxide layers were analysed. Thusly prepared niobium samples were additionally investigated in terms of their corrosion resistance in Ringer's solution. The electropolished niobium surface was determined to be smooth and lustrous. The anodisation led to the growth of barrier-like oxide layers, which were enriched in phosphorus species.


Assuntos
Corrosão , Técnicas Eletroquímicas , Nióbio/química , Oxirredução , Ácidos Fosfóricos , Espectroscopia Fotoeletrônica , Propriedades de Superfície
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