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Correlation of Surface Chemistry and Durability of Aluminum/ Polymer Bonds

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Adhesion Aspects of Polymeric Coatings

Abstract

We have examined the stability of A1 oxide films on A1 alloys against attack by moisture and the relationship between oxide stability and bond durability. The surface composition of phosphoric-acid-anodized (PAA) aluminum alloys was determined using X-ray photoelectron spectroscopy (XPS) and these data were used to construct an Al2O3 - AlPO4 - H2O surface behavior diagram. The fresh PAA oxide surface consists of a monolayer of AlPO4 adsorbed on the porous Al oxide. Hydration of the oxide proceeds first by adsorption of water by the AlPO4 layer. This process is reversible, it can occur during storage, and it does not alter the Al2O3 morphology. Irreversible hydration occurs with the dissolution of the phosphate followed by the conversion of the AI2O3 to boehmite (AlOOH). Finally, bayerite (Al(0H)3) crystallites grow on top of the boehmite.

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Author information

Author notes

  1. T. S. Sun

    Present address: Alcoa Technical Center, Alcoa Center, PA, 15069, USA

Authors and Affiliations

  1. Martin Marietta Laboratories, Martin Marietta Corporation, 1450 South Rolling Road, Baltimore, MD, 21227-3898, USA

    J. S. Ahearn, G. D. Davis, T. S. Sun & J. D. Venables

Authors
  1. J. S. Ahearn
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  2. G. D. Davis
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  3. T. S. Sun
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  4. J. D. Venables
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Editor information

Editors and Affiliations

  1. East Fishkill Facility, IBM Corporation, Hopewell Junction, New York, 12533, USA

    K. L. Mittal

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© 1983 Plenum Press, New York

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Ahearn, J.S., Davis, G.D., Sun, T.S., Venables, J.D. (1983). Correlation of Surface Chemistry and Durability of Aluminum/ Polymer Bonds. In: Mittal, K.L. (eds) Adhesion Aspects of Polymeric Coatings. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-3658-7_16

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  • DOI: https://doi.org/10.1007/978-1-4613-3658-7_16

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4613-3660-0

  • Online ISBN: 978-1-4613-3658-7

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