Advertisement

Journal of Applied Electrochemistry

, Volume 30, Issue 7, pp 845–853 | Cite as

Zinc impregnation of the anodic oxidation layer of 1050 and 2024 aluminium alloys

  • J-P. Dasquet
  • J-P. Bonino
  • D. Caillard
  • R.S. Bes
Article

Abstract

The porous oxide layer obtained by phosphoric anodic oxidation (PAO) of 1050 and 2024T3 aluminium alloys is modified by impregnation with zinc under alternating voltage. The resulting current against applied voltage relationship shows that a threshold voltage is required to deposit the zinc. Beyond a low critical voltage, VcL, zinc electrocrystallization starts near the barrier layer and grows with time through the porous oxide layer whatever the alloy used as substrate. For the 2024T3 alloy, beyond a high critical voltage VcH, S.I.M.S. analysis shows that zinc is also present on top of the oxide layer. The distribution of zinc particles depends on the porous layer morphology: formation of zinc needles in a columnar form (1050 alloy) and dispersion of zinc particles in a disorganized structure (2024T3 alloy). The polarization curves obtained in a 3 wt % NaCl solution show a decrease in anodic and cathodic currents indicating a protective effect of zinc impregnation, confirmed by electrochemical impedance analysis.

alternating voltage aluminium alloys anodic oxidation corrosion impregnation zinc 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    H. Keller, C. Hunter and D. Robinson, J. Electrochem. Soc. 100 (1953) 411.Google Scholar
  2. 2.
    M.C. Sainte Catherine,in T.S. Sudarshan and M. Jeandin (Eds), Proceedings STM8, Nice (1994), p. 1579.Google Scholar
  3. 3.
    J-P. Dasquet, 'Protection d'alliages d'aluminium contre la corrosion par imprégnation métallique de la couche d'oxydation ?tul> anodique', Thesis, Université P. Sabatier, Toulouse (1999).Google Scholar
  4. 4.
    C.R. Martin, Science 266 (1994) 1961.Google Scholar
  5. 5.
    T. Sato and S. Sakai, Trans. Inst. Metal Finish. 57 (1979) 43.Google Scholar
  6. 6.
    A. Andersson, O. Hunderi and C.G. Granqvist, J. Appl. Phys. 51, 61 (1980) 754.Google Scholar
  7. 7.
    A. Baltat-Bazia, 'Etude de la texture des couches d'oxyde anodique sur l'aluminium en vue d'applications au collage', Thesis Paris VI (1992).Google Scholar
  8. 8.
    J. Salmi, 'Elaboration et caracté risation de couches absorbantes sé lectives solaires sur l'alliage d'aluminium 1050', Thesis, Université P. Sabatier, Toulouse, (1999).Google Scholar
  9. 9.
    J. Hitzig, K. Jüttner and W.J. Lorenz, J. Electrochem. Soc. 133 (1986) 887.Google Scholar

Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • J-P. Dasquet
    • 1
  • J-P. Bonino
    • 1
  • D. Caillard
    • 2
  • R.S. Bes
    • 1
  1. 1.Laboratoire de Chimie des Matériaux Inorganiques et EnergétiquesUniversité Paul SabatierToulouse cedexFrance
  2. 2.Centre d'Elaboration des Matériaux et d'Etudes StructuralesToulouse cedexFrance

Personalised recommendations