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A novel method is described for measuring the thickness of a barr ier typ ~ anodic oxide coating or the barrier layer portion of a porous type anodic oxide coating. This method is used to follow the evolution of the barrier layer during the early stages of the formation of a porous type coating on aluminum and to establ ish certain dimen-sions of the fundamental oxide cells which comprise this type of coating.
Hunter et al. (Fri,) studied this question.