Anodic activation of niobium and tantalum in phosphate-fluoride solutions

Journal Article · Sun Jan 10 00:00:00 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), Vol. 60:7; Other Information: Translated from Zhurnal Priklad. Khimii; 60: No. 7, 1660-1662(Jul 1987)
• Country of Publication: United States
• Language: English

Related Subjects

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