XPS Analysis of the Aging of Thin, Adhesion Promoting, Fluorocarbon Treatments of DC Plasma Polymers

Springer Science and Business Media LLC - Tập 6 - Trang 193-209 - 2001
C. E. Moffitt1, Q. S. Yu2, C. M. Reddy2, D. M. Wieliczka1, H. K. Yasuda2
1Department of Physics, University of Missouri – Kansas City, Kansas City
2Surface Science and Plasma Technology Center, Department of Chemical Engineering, University of Missouri – Columbia, Columbia

Tóm tắt

Plasma polymer treatment of aluminum alloys has recently been shown to improve adhesion of primer coatings, thereby reducing the corrosion of thusly protected panels to the levels afforded by conventional chromate conversion coating. One particular plasma polymer system, comprised of a ∼50 nm trimethylsilane DC plasma polymer capped by an ultrathin layer modified by DC hexafluoroethane plasma treatment, has shown tremendous adhesion increases to a wide variety of primers, yielding a coating that is virtually unremovable with conventional stripping applications. An application window was empirically deduced regarding this improved adhesion, indicating that the primer needed to be applied within 5 days of plasma treatment to display the tenacious adhesion to panels. In an effort to elucidate the differences between fresh and aged panels, an X-ray photoelectron spectroscopy (XPS) time study of this system was undertaken. Some direct correlation to this time frame was observed in the XPS data, indicating that a particular fluorocarbon structure in the films modified upon continued atmospheric exposure, rearranging the local bonding environment by introducing additional C—C bonding with an increase in oxygen incorporation.

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Springer Science and Business Media LLC

Tập 6

193-209

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