Abstract
Studies were made of the composition and structure of boehmite films formed on aluminum sheets in boiling aqueous solutions by electron microscopy, electron diffractiometry, and X-ray diffractiometry; and also made of the effects of kind and concentration of additives on the film.The following results were obtained:(1) The results of tests of sheet metals showed that the boehmite film formed on an aluminum sheet consisted of a continuous thin film tightly adhering to the aluminum surface and numerous fine needle crystals, independent of the presence and kind of additives.(2) Both of the continous thin film and fine needle crystals were composed of boehmite, and the latter were preferentially oriented in (001) planes parallel to the surface.(3) The results of tests of aluminum powder showed that only boehmite was formed in water after boiled for 15min., and bayerite was also formed together with boehmits after boiled for 1hr. or more. The addition of triethanolamine to deionized water accellrated the growth of boehmite but inhibited the growth of bayerite. Whereas, the addition of ammonia accelerated the growths of both boehmite and bayerite.(4) The results of X-ray diffractiometry showed that the boehmite formed on aluminum powder was not a standard boehmite, but was judged to be a quasi-boehmite having an excessive water content.
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