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Characterization of Adhesive-Primer Penetration into Porous Oxides Formed on Anodized Aluminum Using Energy Electron Loss Spectroscopy (Eels)

Published online by Cambridge University Press:  02 July 2020

J. I. Cole
Affiliation:
Department of Materials Science and Engineering, University of Washington, Seattle, WA98195
D. O' Brien
Affiliation:
Boeing Commercial Airplane Group, Seattle, WA98124-2207
M. Qian
Affiliation:
Department of Materials Science and Engineering, University of Washington, Seattle, WA98195
R. M. Fisher
Affiliation:
Department of Materials Science and Engineering, University of Washington, Seattle, WA98195
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Extract

The purpose of this investigation is to evaluate the effects that relatively minor changes in phosphoric acid anodizing (PAA) parameters (voltage, temperature, time) have on oxide morphology and the subsequent penetration of an applied adhesive-primer into the porous oxide. This preliminary study examines two cases, one in which industry-standard PAA parameters have been followed, and a second in which the PAA parameters are slightly above industry limits.

Baseline PAA parameters have been developed in the aerospace industry from extensive empirical testing in order to maximize adhesive bond strength and durability in the presence aggressive environments. It has been noted that for effective mechanical strength of structurally bonded elements, penetration of the adhesive primer into the porous oxide formed by an anodizing pre-treatment is critical. Verifying primer penetration is somewhat problematic due to the high spatial resolution required to both structurally and chemically characterize an oxide film on the order of one micron in thickness.

Type
Oxidation, Corrosion, and Protective Coatings
Copyright
Copyright © Microscopy Society of America 1997

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References

Brockmann, W.et al., Int. J. Adhesion and Adhesives, Vol. 6 (1986) 115.10.1016/0143-7496(86)90016-3CrossRefGoogle Scholar
Marceau, J. A., in Thrall, E. W.et al. eds., Adhesive Bonding of Aluminum Alloys, New York: Marcell Dekker, Inc. (1985) 51.Google Scholar