Abstract

THE thickening of oxide or other films on metals according to the parabolic equation y2= K1t + K2 (where y is the film thickness at time t and all K's are constants) is generally attributed to lattice-defects, K1 being related to the electrical constants of the film substance by Wagner's equations1. Logarithmic thickening (y = K3 log (K4t + K5) is, in my view2, associated with discrete mechanical breakdowns caused by the strains arising from the volume increase accompanying oxidation ; evidence of such strains is provided by the wrinkling observed during film-stripping3.

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