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X-ray photoelectron spectroscopy and corrosion studies of zinc phosphate coated on 7075-T6 aluminium alloy

Part II: Effect of coating pH

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Abstract

Coated layers which formed on 7075-T6 aluminium alloy surfaces after treatment in zinc phosphate (ZPO) suspensions adjusted to different pH values (3.5, 5.0, 6.6, 10.5 and 13.0) were characterized by X-ray photoelectron spectroscopy (XPS). Comparative XPS tests were also made after the treated surfaces were exposed to a 3.5% NaCl solution for 5 h. The processes of coating from solution, oxidation, etching and bulk diffusion were all involved, although in different proportions, in the different treatments. The amounts of zinc and phosphorus in the uppermost layers were enhanced when the coating was at pH values of 5.0, 10.5 and 13.0, and in each case a mixed ZnOx-AlOx-ZPO structure was apparently formed. The coating prepared at pH=13.0 appeared to provide the best corrosion protection.

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Authors and Affiliations

  1. Department of Chemistry, University of British Columbia, 2036 Main Mall, V6T 1Z1, Vancouver, British Columbia, Canada

    W. F. Heung, Y. P. Yang, M. Y. Zhou, P. C. Wong & K. A. R. Mitchell

  2. Chemistry Group, Defence Research Establishment Pacific, FMO Victoria, VOS 1B0, British Columbia, Canada

    T. Foster

Authors
  1. W. F. Heung
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  2. Y. P. Yang
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  3. M. Y. Zhou
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  4. P. C. Wong
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  5. K. A. R. Mitchell
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  6. T. Foster
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Heung, W.F., Yang, Y.P., Zhou, M.Y. et al. X-ray photoelectron spectroscopy and corrosion studies of zinc phosphate coated on 7075-T6 aluminium alloy. JOURNAL OF MATERIALS SCIENCE 29, 3653–3657 (1994). https://doi.org/10.1007/BF00357331

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  • DOI: https://doi.org/10.1007/BF00357331

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