Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
ISSN-L : 1344-3542
Articles
Electrochemical Impedance of Rust Film Fabricated by Deposition from Fe(III) in Solution
Masayuki ITAGAKIHarumi ARAKIIsao SHITANDAKunihiro WATANABEHideki KATAYAMAKazuhiko NODA
Author information
JOURNALS OPEN ACCESS

2007 Volume 75 Issue 12 Pages 945-949

Details
Abstract

The physical and chemical properties of the rust film are quite significant for the corrosion resistance of weathering steel. The investigations of the ion-selective permeability and the ion-permeation resistance (film resistance) are necessary to characterize the rust film. In the present paper, the membrane potential and the electrochemical impedance of the rust film, which was fabricated by the precipitation of Fe(III) from the solution, were measured. The rust film showed the anion-selective permeability in the neutral solution, indicating that the pore wall in the rust film has a positive fixed charge. The measurements of electrochemical impedance of the rust film membrane were performed by four-electrode method. The working and reference electrodes were platinum wire and silver/silver chloride electrode, respectively. The current between two working electrodes was measured by controlling the alternative voltage between two reference electrodes. The electrochemical impedance showed an apparent capacitive loop on the complex plane, and the diameter of the capacitive loop corresponds to the film resistance. The ion-selective permeability and the film resistance were changed depending on the adsorption of metallic ions on the rust film.

Information related to the author
© 2007 The Electrochemical Society of Japan
Previous article Next article
feedback
Top