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  • The characterization of Al alloy surfaces at each stage of preparation for adhesive bonding = Karakterizacija Al zlitin - priprava površine za lepljenje
    Grant, John T. ; Smith, J.A. ; Mazza, J.J.
    Many sets of AA 2024-T3 and 7075-T6 samples were fabricated and examined with X-ray Photoelectron Spectroscopy (XPS) for surface composition at different stages of preparation, for eventual adhesive ... bonding. With XPS, all elements except hydrogen and helium are detectable, with a detectability limit of about 0.1 to 1 atomic percent. The goal of this work was to build a database of the surface composition at each stage of substrate processing, namely, after (a) wiping with acetone, (b) hand-abrading with Scotch-Brite and Alconox, (c) grit blasting with alumina, (d) coating via a sol-gel process, and (e) priming. In some cases, steps (b) and (c) were replaced with abrasion using a Scotch-Brite Roloc dise driven by a high-speed grinder. Having such a database, allows one to examine and monitor surface composition changes with the various preparation steps, and ideally relate preparation methods to adhesive bond strength. After acetone wiping, relatively high concentrations of Mg are present on the surface. The Mg is present as oxide and is due to the processing of the alloy by the supplier. Cu and Mg are the main alloying components in AA 2024-T3, and Zn, Mg and Cu are the main components in AA 7075-T6. No Cu was detected on the surfaces after acetone wiping, but Zn was found on all surfaces. After abrading, the Mg concentration was always less than that of Al. Grit blasting produced numerous changes in composition, but some new contaminants were found. These contaminants were found to be present on the alumina grit used. After sol-gel coating, Si and Zr from the sol-gel were detected. After priming, Zr from the sol-gel was still detected on all samples, indicating that the primer coating was thin or non-homogeneous in thickness. The Si/Zr ratio increased though, as Si is also present in the primer. Some measurements were also made using a commercial sol-gel kit, and they are compared to results using sol-gel prepared in our laboratory.
    Vir: Materiali in tehnologije = Materials and technology. - ISSN 1580-2949 (Letn. 38, št. 5, 2004, str. 223-231)
    Vrsta gradiva - članek, sestavni del
    Leto - 2004
    Jezik - angleški
    COBISS.SI-ID - 361642

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