Author/Authors :
Sowa، نويسنده , , Maciej and Gre?، نويسنده , , Katarzyna and Kukharenko، نويسنده , , Andrey I. and Korotin، نويسنده , , Danila M. and Michalska، نويسنده , , Joanna and Szyk-Warszy?ska، نويسنده , , Lilianna and Mosia?ek، نويسنده , , Micha? and ?ak، نويسنده , , Jerzy and Pamu?a، نويسنده , , El?bieta and Kurmaev، نويسنده , , Ernst Z. and Cholakh، نويسنده , , Seif O. and Simka، نويسنده , , Wojciech، نويسنده ,
Abstract :
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 1 mol dm− 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 Ringerʹs 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.
Keywords :
Anodic oxidation , Electropolishing , Phosphoric acid , CORROSION RESISTANCE , X-ray photoelectron spectroscopy , niobium
