AVS 45th International Symposium
    Applied Surface Science Division Thursday Sessions
       Session AS-ThP

Paper AS-ThP13
Structure of Plasma Polymerized SiO@sub2@Films: Corrosion Protection of Steel and Aluminum Substrates

Thursday, November 5, 1998, 5:30 pm, Room Hall A

Session: Aspects of Applied Surface Science Poster Session
Presenter: R.G. Dillingham, Brighton Technologies Group, Inc.
Authors: R.G. Dillingham, Brighton Technologies Group, Inc.
F.J. Boerio, University of Cincinnati
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Plasma polymerized organosiloxanes made using excess oxygen as a carrier gas have a silica-like structure, and function as excellent corrosion inhibiting coatings and primers for adhesive bonding and painting. Similar structures can be obtained using a variety of reactor configurations and polymerization conditions, but details of film structure and performance can vary. Infrared spectra of these films show non-bridging Si-O and -OH species. The relative amount of structural imperfection is a strong function of deposition conditions. These structural features provide reactivity necessary for adhesion of paints and adhesives, but limit corrosion protection, probably by increasing electrolyte diffusion. Structures that provide optimum corrosion protection do not necessarily provide optimum overlayer adhesion. This work relates film deposition conditions to structural defects, and shows how these defects affect the electrical impedance spectra and corrosion inhibiting capabilities of plasma polymerized SiO@sub2@.