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By means of interference colors the rates of oxidation were determined for 18 nonferrous metals and were compared with those for typical steels. The influence of temperature, oxidation time, and film thickness on the rate of oxidation is illustrated by projections of surface in three-dimensional diagrams. The diagrams for the nonferrous metals are similar to those for steels. For a constant film thickness, the relation between temperature and oxidation time is linear logarithmic. The variation of film thickness with either temperature or oxidation time, plotted logarithmically, is represented by a reversed curve. A discussion is given of the influence of the affinity of the metal for oxygen and of the rate of diffusion through the oxide film. The film behaves as if the specific resistance varies nonlinearly with the film thickness. CONTENTS Page

Rate of oxidation of typical nonferrous metals as determined by interference colors of oxide films