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The co rros ion of singl e crystals of high-puri ty aluminum in strollg ac id and alkali media is disclosed as an ordedy process, the rate of attack bein g dependent on the ori entation of the corroding sLIl·face. For a 15-percen t N aOH solution , corrosion apparent ly progressedby revealing facet surf3ces of the [335] ty pe, resul t in g in gross corrosio n of sph eres into cubes; In contrast, s ubstan t iating other invest igatio ns, corros ion in aqua regia-hydrofluori c acid mixt ure r evealed etch pits wi t h surfaces of t he [100] typ e, resul t in g in gross corros ion of s ph eres into equilateral octa hedra. Observat iolls of the corros ion bv acid and a lka li solu t ions of dis ks \\·it h ce ntral holes, and r ectangu la r pris ms, both of mon oc rvstallin e a luminum, r es ul t in in terest ing co nc lusio ns and compariso ns wi t h respect to th e cOITos ion process.

Influence of crystallographic orientation on the corrosion rate of aluminum in acids and alkalies