Heat Flow during Surface Colour Formation

Abstract

WHEN gaseous substances slowly react with metals, and the volume of the solid resultants is greater than that of the metal at the temperature of reaction, a series of bright interference colours is generally produced. Some anomalous features are shown, however, when the dynamics of the formation of the films are considered, and occur generally independently of the gaseous reagent and the nature of the solid metal. The rate of formation slows down faster than described by the laws of diffusion through a thickening film at constant temperature, and, further, if the gaseous reactant be removed, causing the interruption of the reaction, the speed at which the reaction re-occurs diminishes. The longer the time of arrest the more marked is the slowing down, and in some cases, for example, temper colours on steel, the colour appears to be fixed.

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CONSTABLE, F. Heat Flow during Surface Colour Formation. Nature 134, 100 (1934). https://doi.org/10.1038/134100b0

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