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Self-Assembled Films as Corrosion Protective Coatings for Metal Surfaces
Final rept. 15 Mar 1995-31 Dec 1996
AERODYNE RESEARCH INC BILLERICA MA
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In this Final Report, we describe research performed on the corrosion inhibitive properties of self-assembled monolayers SAMs of stearic acid and 10,12-pentacosadiynoic acid 10,12-PDA on aluminum. Infrared IR and X-ray photoelectron spectroscopy, in addition to wetting measurements, were employed to study the corrosion process. Monolayers of stearic acid on aluminum surfaces were found to profoundly affect the wettability of Al surfaces by concentrated sulfuric acid, but not to act as a significant barrier to corrosion. However, to the extent that the SAM coating limits the wettability of the metal surface, it reduces the degree of corrosion. Toward our goal of creating impermeable organic layers, we studied the adsorption and subsequent UV-induced cross linking of 10,12-PDA acid on aluminum. JR and XPS studies as well as macroscopic wettability and corrosion experiments indicate that the resulting coverage of 10,12-PDA on the aluminum surface is very low. We propose experiments which will focus on improving PDA adsorption on Al and on the effect of UV-induced cross linking on the corrosion resistance.
APPROVED FOR PUBLIC RELEASE