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Journal of Materials Science

, Volume 29, Issue 14, pp 3653–3657 | Cite as

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

Part II: Effect of coating pH
  • W. F. Heung
  • Y. P. Yang
  • M. Y. Zhou
  • P. C. Wong
  • K. A. R. Mitchell
  • T. Foster
Article

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.

Keywords

Oxidation Polymer Aluminium Zinc Phosphorus 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • W. F. Heung
    • 1
  • Y. P. Yang
    • 1
  • M. Y. Zhou
    • 1
  • P. C. Wong
    • 1
  • K. A. R. Mitchell
    • 1
  • T. Foster
    • 2
  1. 1.Department of ChemistryUniversity of British ColumbiaVancouverCanada
  2. 2.Chemistry Group, Defence Research Establishment PacificFMO VictoriaCanada

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