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The oxidation of a metal forming a transparent oxide allows it to be followed in situ by optical interference. The layer thicknessis determined from the interference pattern. The method can be applied to any tarnishing process as long as the resultinglayer stays transparent. Oxidation of copper is followed in air, at T = 230 o C, making use of the three colors of a video camera. In this case a two phase, Cu 2 O|CuO scale is formed on Cu. An analysis of the rate of formation of two layers of two phases is presented. The rate constantsare related to a surface reaction rate or to bulk diffusion and conductivity. It is shown that while the total amount of oxideincreases with time the layer thickness of one of the phases can temporarily decrease. In the long time limit both layersfollow the parabolic law i.e. increase as √time. The method can be applied also to the inverse process of reduction and decrease in the scale thickness.

Determination of the Parameters that Control Oxidation Using Optical Interference, Applied to the Two Phase Oxide Scale on Copper