Abstract
THE formation of boehmite on the surface of anodized aluminium by immersion in boiling water has been investigated by Hart1. In particular, studying ammonium borate anodic films on aluminium, he found by electron diffraction that the pseudo-amorphous structure of the surface layer was converted to boehmite, but that this change did not occur when the detached film was immersed in boiling water. Hart therefore suggested that the mechanism of the process was an outward movement of aluminium ions from the metal, passing through the oxide layer, and combining with hydroxyl ions to form boehmite in the pores of the existing oxide layer and on the outer surface.
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References
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“X-Ray Identification and Crystal Structure of Clay Minerals”, edit. by Brindley, G. W., 264 (Mineralogical Soc., London, 1951).
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HINDE, R., KELLETT, E. & HARRIS, P. Sealing of Aluminium Oxide Anodic Films. Nature 183, 39 (1959). https://doi.org/10.1038/183039a0
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DOI: https://doi.org/10.1038/183039a0
