title: Influence of electropolishing and anodic oxidation on morphology, chemical composition and corrosion resistance of niobium.
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 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.
authors: Faculty of Chemistry, Silesian University of Technology, B. Krzywoustego Street 6, 44-100 Gliwice, Poland.
authors: Maciej
authors: M
authors: Sowa
authors: Faculty of Chemistry, Silesian University of Technology, B. Krzywoustego Street 6, 44-100 Gliwice, Poland.
authors: Katarzyna
authors: K
authors: Greń
authors: Institute of Metal Physics, Russian Academy of Sciences-Ural Division, S. Kovalevskoi Street 18, 620990 Yekaterinburg, Russia; Ural Federal University, Mira Street 19, 620002 Yekaterinburg, Mira str. 19, Russia.
authors: Andrey I
authors: AI
authors: Kukharenko
authors: Institute of Metal Physics, Russian Academy of Sciences-Ural Division, S. Kovalevskoi Street 18, 620990 Yekaterinburg, Russia.
authors: Danila M
authors: DM
authors: Korotin
authors: Faculty of Materials Engineering and Metallurgy, Silesian University of Technology, Krasińskiego Street 8, 40-019 Katowice, Poland.
authors: Joanna
authors: J
authors: Michalska
authors: Jerzy Haber Institute of Catalysis and Surface Chemistry PAS, Niezapominajek Street 8, 30-239 Kraków, Poland.
authors: Lilianna
authors: L
authors: Szyk-Warszyńska
authors: Jerzy Haber Institute of Catalysis and Surface Chemistry PAS, Niezapominajek Street 8, 30-239 Kraków, Poland.
authors: Michał
authors: M
authors: Mosiałek
authors: Faculty of Chemistry, Silesian University of Technology, B. Krzywoustego Street 6, 44-100 Gliwice, Poland.
authors: Jerzy
authors: J
authors: Zak
authors: AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Mickiewicza Avenue 30, 30-059 Kraków, Poland.
authors: Elżbieta
authors: E
authors: Pamuła
authors: Institute of Metal Physics, Russian Academy of Sciences-Ural Division, S. Kovalevskoi Street 18, 620990 Yekaterinburg, Russia.
authors: Ernst Z
authors: EZ
authors: Kurmaev
authors: Ural Federal University, Mira Street 19, 620002 Yekaterinburg, Mira str. 19, Russia.
authors: Seif O
authors: SO
authors: Cholakh
authors: Faculty of Chemistry, Silesian University of Technology, B. Krzywoustego Street 6, 44-100 Gliwice, Poland. Electronic address: wojciech.simka@polsl.pl.
authors: Wojciech
authors: W
authors: Simka
mesh_terms: D003343:Corrosion; D055664:Electrochemical Techniques; D009556:Niobium / Q000737:chemistry*; D010084:Oxidation-Reduction; D010756:Phosphoric Acids; D056951:Photoelectron Spectroscopy; D013499:Surface Properties
chemical_list: D010756:Phosphoric Acids; D009556:Niobium; C030242:phosphoric acid
keywords: Anodic oxidation; Corrosion resistance; Electropolishing; Niobium; Phosphoric acid; X-ray photoelectron spectroscopy