AVS 45th International Symposium
    Biomaterial Interfaces Group Monday Sessions
       Session BI-MoP

Paper BI-MoP10
Surface Analysis of Anodic Behavior of 316L SS in SRB-Containing Seawater

Monday, November 2, 1998, 5:30 pm, Room Hall A

Session: Biomaterial Interfaces Poster Session
Presenter: G. Chen, Constellation Technology Corporation
Authors: G. Chen, Constellation Technology Corporation
D.C. White, University of Tennessee/Oak Ridge National Laboratory
R.J. Palmer, University of Tennessee/Oak Ridge National Laboratory
S.S. Cristy, Lockheed Martin Energy Systems
Correspondent: Click to Email
Type 316L stainless steel concentric electrodes were exposed to pure cultures of Desulfovibrio desulfuricans, of Vibrio harveyi and the coculture of these bacteria. A 1 microA/cm@super 2@ current was applied for 3 days while the chemostats were closed systems. Subsequently, aerated fresh medium was added. Impedance spectroscopy detected pitting of the coculture-exposed electrodes after addition of fresh medium. X-ray photoelectron spectroscopic analysis after current application and at the end of the experiment revealed that oxygen reduction induced pitting by: (a) formation of a SO@sub 4@@super 2-@, S@sub 2@O@sub 3@@super 2-@ and SO@sub 3@@super 2-@ mixture, (b) oxidation of relatively stable compounds such as Cr(OH)@sub 3@ and, (c) causing sulfides to penetrate the passive film.