Abstract
THE formation of boehmite on anodized and non-anodized aluminium surfaces by boiling-water treatment has been discussed by Hart1. He found by electron diffraction study of ammonium borate anodic films on aluminium that such treatment changed the quasi-amorphous structure of the coating to boehmite, whereas with films stripped from the metal this change did not occur. Hart suggested that the formation of boehmite was due to an electrochemical reaction in which aluminium ions from the aluminium base moved outward through the oxide film to meet hydroxyl ions and formed boehmite in the pores or on the outer surface. Application of this theory to sulphuric acid anodic coatings which are much thicker and more porous than the borate films is of interest since it is generally believed2 that the formation of boehmite during boiling-water sealing of such coatings is due to hydration of the aluminium oxide.
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References
Hart, R. K., Trans. Farad. Soc., 50, 269 (1954).
Wernick, S., and Pinner, R., “Finishing of Aluminium”, 354 (Robert Draper, Ltd., 1956).
ASTM Spec. B 137–45.
Wernick, J., J. Electrodep. Tech. Soc., 9, 153 (1934).
Harrington and Nelson, Amer. Inst. Mech. Min. Eng., 7 (2), TP 1158 (1940).
Russell, A. S., Alumina Properties, Tech. Paper No. 10 (Aluminium Research Laboratories, Pittsburgh, 1953).
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SPOONER, R. Water Sealing of Detached Aluminium Oxide Anodic Film. Nature 178, 1113–1114 (1956). https://doi.org/10.1038/1781113a0
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DOI: https://doi.org/10.1038/1781113a0
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