Abstract
EIS in the 100 kHz–1 mHz frequency range was applied to the study of changes in cold sealed aluminium oxide films exposed to highly wet and extremely dry atmospheres. Information about these changes was obtained from evolution of the impedance diagrams and, in particular, from film resistance and capacitance values determined from them. Results show that sealing quality, assessed from EIS, increases over months and years as ageing proceeds in a natural atmosphere. The analysis was completed with the aid of XPS and EDX techniques and standard quality control tests. Measurements show that specimens aged very rapidly in wet atmospheres, so that they passed all sealing quality tests within 72h. The sealing quality improves with ageing even in highly dry atmospheres despite the fact that pores lose part of their initial filling water. XPS analysis revealed that fluorine and nickel concentrate in the outer layers of cold sealed anodic films; on the other hand, films obtained by the traditional HTS procedure exhibit a uniform composition throughout their thickness.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
S. Wernick, R. Pinner and P. Sheasby, The Surface Treatments of Aluminium and its Alloys. ASM International and Finishing Publications Ltd, 5th edn, Metals Park, OH, (1987) pp. 773–856.
M.R. Kalantary, D.R. Gabe and D.H. Ross, Aluminium Finish. 13(4–5) 33.
M.R. Kalantary, D.R. Gabe and D.H. Ross, Plat. Surf. Finish. 80 (12) 52.
M.R. Kalantary, D.R. Gabe and D.H. Ross, J. Appl. Electrochem. 22 (1992) 268.
E.P. Short and A. Morita, Plat. Surf. Finish. 75(6) (1988) 102.
E.P. Short and A. Morita, Trans. IMF. 67 (1989) 13.
Yi Li and Z. Zhu, Plat. Surf. Finish. 80(9) (1993) 79 and 80(10) 77.
A. Dito and F. Tegiacchi, Plat. Surf. Finish. 72(6) (1985) 72.
E. De Paolini and A. Dito, Aluminium 66(3) (1990) 243.
A. Dito and P. Cavallotti, Galvano Organo 1 (1985) 81.
Anonymous, Directives concernant un label de qualite pour le film anodique sur l'aluminium destiné a l'architecture. European An-odisers Association EWAA-EURAS.
R. Lizarbe, W. LÓpez, E. Otero and J.A. González, Rev. Metal. Madrid 26 (1990) 359.
R. Lizarbe, J.A. González and W. López y E. Otero, Aluminium 68 (1992) 140.
R. Lizarbe, J.A. González and W. López y E. Otero, Aluminium 69 (1993) 548.
J. Hitzing, K. Jüttner, W.J. Lorenz and W. Paatsch, J. Electro-chem. Soc. 133 (1986) 887.
F. Mansfeld, Corrosion 44 (1988) 856.
T.P. Hoar and G.C. Wood, Electrochim. Acta. 7 (1966) 33.
N. Celati, M.C. Sainte Catherine, M. Keddam and H. Takenouti, Mater. Sci. Forum 192–194 (1995) 335.
J.L. Dawson, G.E. Thompson and M.B.H. Ahmadun, Evolution of electrochemical impedance during sealing of porous anodic films on aluminium. In: J.R. Scully, D.C. Silverman and M.W. Kendig (eds) ASTM STP 1188, American Society for Testing Materials (ASTM), Philadelphia (1993) pp. 255–275.
N.A. Thorne, P. Thuery, A. Frichet, P. Gimenez and A. Sartre, Surf. Interface. Anal. 16 (1990) 236.
N.S. McIntyre and M.G. Cook, Anal. Chem. 47 (1975) 2208.
A. Brocheriux, O. Dessaux, P. Goudmand, L. Gengembre, J. Grimblot, M. Brunel and R. Lazzaroni, Appl. Surf. Sci. 90 (1995) 47.
J.A. González, X.R. Nóvoa, V. López, A. Bautista and E. Otero, J. Appl. Electrochem. 29 (1999) 229.
C.T. Lynch (ed.), Handbook of Materials Science. vol. 2., CRC Press, Cleveland, OH, pp. (1975) 362–3.
S. Wernick, R. Pinner and P. Sheasby, The Surface Treatments of Aluminium and its Alloys, ASM International and Finishing Publications, 5th edn, Metals Park, OH, (1987) p. 937.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
González, J., Feliu, S., Bautista, A. et al. Changes in cold sealed aluminium oxide films during ageing. Journal of Applied Electrochemistry 29, 843–852 (1999). https://doi.org/10.1023/A:1003569330080
Issue Date:
DOI: https://doi.org/10.1023/A:1003569330080