Influence of chloride concentration on surface oxide films on niobium

Journal Article · Thu Mar 01 00:00:00 EST 1984 · Corrosion (Houston); (United States)

OSTI ID:6141734

Gad Allah, A G

A study by potential measurements of a niobium electrode in chloride solutions shows that the corrosion potential is a function of Cl/sup 1/ ion concentration and decreases with increase in concentration. During polarization, the efficiency of oxide formation is decreased due to preferential adsorption of Cl/sup 1/ ions on the oxide surface acting as a depolarizer for the main anodic process. Impedance measurements in various HCl concentrations reveal that the properties of the film are greatly influenced. The results create some doubt that; it can act as a perfect dielectric.

• Research Organization: Department of Chemistry, Faculty of Science, University of Cairo, Giza
• OSTI ID: 6141734
• Journal Information: Corrosion (Houston); (United States), Vol. 40:3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ELECTRODES
ELECTROCHEMICAL CORROSION
HYDROCHLORIC ACID
CORROSIVE EFFECTS
NIOBIUM
ADSORPTION
CHEMICAL REACTIONS
CHLORINE COMPOUNDS
DIELECTRIC MATERIALS
SURFACE AREA
THIN FILMS
CORROSION
ELEMENTS
FILMS
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MATERIALS
METALS
SORPTION
SURFACE PROPERTIES
TRANSITION ELEMENTS
360105* - Metals & Alloys- Corrosion & Erosion