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Underfilm corrosion on polyurethane-coated aluminum alloy 2024-T3 containing dissimilar metal fasteners

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Abstract

Panels of AA2024-T3 were fastened using Cu and Cu−Ni fasteners, pretreated, and coated with around 25 μm of polyurethane film. The pretreatments were based on typical conversion coating processes. Samples included alkalinecleaned, deoxidized, and conversion-coated. The conversion coatings included chromate and cerium-based conversion coatings. Samples were tested by scribing around the fastener and on the AA2024-T3 (matrix), exposing them to HCl vapor for 15 min, and subjecting them to a filiform corrosion test by exposure to 82% relative humidity at 40±1°C for up to 1000 hr. Inspection showed that the filiform corrosion that developed from a scribe around the fastener was an order of magnitude larger than from a scribe on the matrix (scribe on AA2024-T3). With respect to the surface treatments, the amount of filiform corrosion for scribes on the matrix was greatest on the alkaline-cleaned samples, followed by the deoxidized samples, with the conversion-coated samples performing the best. The amount of filiform corrosion for scribes around the fasteners was highest for the deoxidized sample.

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Authors and Affiliations

  1. Ecole Polytechnique de l’université de Nantes, Rue Christian Pauc, BP 90604, 44306, Nantes, France

    S. Intem

  2. Corrosion Science and Surface Design, CSIRO Manufacturing & Materials Technology, Locked Bag 33, Clayton Sth MDC, 3169, Clayton, Australia

    A. E. Hughes, A. K. Neufeld & T. Markley

  3. CSIRO Minerals, Box 312, 3169, Clayton South, Australia

    A. M. Glenn

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Intem, S., Hughes, A.E., Neufeld, A.K. et al. Underfilm corrosion on polyurethane-coated aluminum alloy 2024-T3 containing dissimilar metal fasteners. J Coat. Technol. Res. 3, 313–322 (2006). https://doi.org/10.1007/s11998-006-0028-z

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