Journal of Applied Electrochemistry

, Volume 29, Issue 9, pp 1063–1071 | Cite as

Influence of alloying elements and microstructure on aluminium sacrificial anode performance: case of Al–Zn

  • D.R. Salinas
  • S.G. García
  • J.B. Bessone


The electrochemical behaviour of Al–x%Zn alloys (1 wt% ≤ x ≤ 80 wt% ) was studied in 0.5 m sodium chloride solution. The experiments focused on the influence of casting conditions on sacrificial anode performance. The influence of casting conditions, solidification structure, polarization behaviour and attack morphology on the anode efficiency and operating potential was analysed. For alloys with low Zn content (1–5 wt%), the interdendritic zones or grain boundaries were the initial sites of attack and self corrosion was the principal cause of efficiency loss. Particularly, for Zn contents below 3 wt% the operating potential was strongly affected by the solidification macrostructure. Casting conditions that produced better alloying element distribution (chill structures) promoted higher anode efficiency. For Zn content higher than 5 wt% the operating potential and the anode efficiency were defined by the α/β phases area relationship.

anodes efficiency alloy microstructure aluminium sacrificial anodes 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    M.G. Flemings, 'Solidification Processing' (McGraw-Hill, New York, 1974).Google Scholar
  2. 2.
    J.T. Reading and J.J. Newport, Mater. Protect. 5 (1966) 15.Google Scholar
  3. 3.
    D.R. Salinas and J.B. Bessone, Corrosion 47 (1991) 665.Google Scholar
  4. 4.
    J.B. Bessone, R.A. Suarez Baldo and S.M. de De Micheli, Corrosion 37 (1981) 533.Google Scholar
  5. 5.
    J. Morgan, `Cathodic Protection' (NACE, 1995), chapter 4. p. 113.Google Scholar
  6. 6.
    L.L. Shreir, `Corrosion', Vol. 2 (Butterworths, London 1978), p. 11–21.Google Scholar
  7. 7.
    P.R. Sperry and M.H. Bankard, Metallographie Techniques for Aluminum Alloys, in `Metals Handbook', 8th edn., Vol. 8, (ASM, Metals Park, OH, 1973), p. 120.Google Scholar
  8. 8.
    D.T. Hawkins and R. Hultgren, Constitution of Binary Alloys, in `Metals Handbook', 8th edn., Vol. 8, (ASM, Metals Park, OH, 1973), p. 265.Google Scholar
  9. 9.
    A. Zahra, C.Y. Zahra and R. Ciach, J. Thermal Anal. 26 (1983) 303.Google Scholar
  10. 10.
    J.R. Scott and H. Lee Craig, Jr, Proceedings 4th NACE Meeting (1971), p. 179.Google Scholar
  11. 11.
    G. KnoÈ rnschild, J. Heldt, H. Mitterbacher and H. Kaesche, Werkst. Korros. 46 (1995) 572.Google Scholar
  12. 12.
    I.L. MuÈ ller and J.R. Galvele, Corr. Sci. 17 (1977) 995.Google Scholar
  13. 13.
    D.H. Hooton and N.E. Giorgetta, X-Ray Spectrom. 6 (1977) 2.Google Scholar

Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • D.R. Salinas
    • 1
  • S.G. García
    • 1
  • J.B. Bessone
    • 1
  1. 1.Inst. de Ing. Electroquímica y Corrosión (INIEC), Dpto. de Qca. e Ing. Qca.Universidad Nacional del SurBahía BlancaArgentina

Personalised recommendations