Surface enhanced Raman spectroscopy study of galvanostatic reduction of the passive film on iron

Journal Article · Mon Nov 01 04:00:00 EST 1999 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1392592· OSTI ID:20003940

Schroeder, V; Devine, T M

Surface enhanced Raman (SER) spectra were acquired continuously with time during the galvanostatic reductive dissolution of the passive film grown on iron in borate buffer (pH 8.4) by anodic polarization at one of three different potentials, +1,000, +600, and 0 mV (SCE). Complementary measurements of the SER spectra of the passive film were made during the formation of the film by galvanostatic anodic polarization. The results indicate that the passive film consists of a layered structure with at least two components. The inner layer is most likely Fe{sub 3}O{sub 4} and the outer layer is primarily an Fe(III) species with an SER spectrum that is characterized by an intense, broad peak centered in the range 570--524 cm{sup {minus}1}. The outer layer may also contain {gamma}-Fe{sub 2}O{sub 3} that is associated with an SER spectroscopy peak at 690 {+-} 5 cm{sup {minus}1}.

• Research Organization: Univ. of California, Berkeley, CA (US)
• OSTI ID: 20003940
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 11 Vol. 146; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORATES
BUFFERS
DISSOLUTION
ELECTROCHEMICAL CORROSION
FILMS
IRON
PASSIVATION
RAMAN SPECTRA