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Abstract Natural immersion of barrier-type anodic films on aluminium in chromate /dichromate solutions of varying pH leads to a progressive increase in the film capacitance which is normally attributed to simple uniform thinning of the anodie films.However,transmission electron microscopy of ultramicro- tomed sections of the immersed films shows an overall film thickness decrease which is much less than anticipated from the measured capacitance data. This significant discrepancy between thickness data is associated with a more complex penetration of chromate species within the anodic film,with the outer layer eventually becoming disaggregated and dissolved.This conclusion is supported by Auger electron spectroscopy data,which show a chromium uptake in the outer layers of the immersed films.
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Received: 25 August 1982
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Cite this article:
Xu Naixin (Shanahai Institute of Metallurgy.Academia Sinica)G.E.Thompson J.L.Dawson G.C.Wood (Corrosion and Protection Centre;UMIST;Manchester;U.K.). DISSOLUTION OF ANODIC FILMS ON ALUMINIUM IN CHROMATE/DICHROMATE SOLUTIONS. J Chin Soc Corr Pro, 1982, 2(4): 27-36.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1982/V2/I4/27
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