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Abstract The impedance behaviour of aluminium supporting air-formed and anodie films has been examined during immersion in neut al molar Na_2CrO_4/Na_2Cr_2O_7 solution. High frequency data were largely associated with dielectric properties of the oxide films whilst low frequency data, below 1 Hz, gave information on faradaic processes proceeding at flaws. With air-formed films the faradaic processes decreased progressively to a constant rate consistant with the increase in potential, indicating the healing of surface flaws. The processes occurring on immersed anodic films were more complex. During the first 10 hours the initial film dissolution was accompanied by a decrease in potential with an apparent plugging of flaws. However, after about 20 hours, the anodic film thickness decreased sufficiently to allow the faradaic processes toinerease to, the final steady state value.
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Received: 25 June 1985
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Cite this article:
Xu Naixin(Shanghai Institute of Metallurgy; Academia Sinica)J.L.Dawson G.E.Thompson G.C.Wood(Corrosion and protection Centre; UMIST; Enyland). A. C. IMPEDANCE STUDY OH THE INTERACTION OF CHROMATE/DICHROMATE WITH OXIDE FILM ON ALUMINIUM. J Chin Soc Corr Pro, 1985, 5(3): 165-175.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1985/V5/I3/165
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