Anodic activation of niobium and tantalum in phosphate-fluoride solutions

Journal Article · Sun Jan 10 04:00:00 EST 1988 · J. Appl. Chem. USSR (Engl. Transl.); (United States)

OSTI ID:6153229

Bairachnyi, B I; Stepanova, I I

An analysis of the polarization curves for the anodic dissolution of niobium and tantalum in the coordinates showed they are described by Fafel's equation with a slop of the linear sections of -0.125 for niobium and -0.123 for tantalum. In solutions that contained hydrofluoric acid the anodic-anionic polarization of niobium and tantalum was accompanied by the destruction of the oxide film by the fluoride ions and dissolution of the metal phase. Effects of polishing and glossing of the surface of the investigated metals were observed at certain conditions.

• OSTI ID: 6153229
• Journal Information: J. Appl. Chem. USSR (Engl. Transl.); (United States), Journal Name: J. Appl. Chem. USSR (Engl. Transl.); (United States) Vol. 60:7; ISSN JAPUA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
ANODES
CHALCOGENIDES
CHEMICAL ACTIVATION
CHEMICAL REACTIONS
CORROSION
DISSOLUTION
ELECTROCHEMICAL CORROSION
ELECTRODES
ELEMENTS
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
METALS
NIOBIUM
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHOSPHORIC ACID
POLARIZATION
POTENTIOMETRY
REFRACTORY METAL COMPOUNDS
TANTALUM
TANTALUM COMPOUNDS
TANTALUM OXIDES
TITRATION
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS