The Oxidation and Evaporation of Magnesium at Temperatures from 400° to 500° C

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Abstract
A vacuum microbalance technic is used for the study of the oxidation and evaporation of magnesium at temperatures from 400° to 500° C and at several pressures. The curves obtained consist of an initial evaporation period, an oxidation period, and a final evaporation period. The oxidation curves at temperatures of 475° C and higher are linear with the time of oxidation. At temperatures of 450° C and lower, the curves follow the linear law, but, as the film builds up, the oxidation rate diminishes. An analysis of the initial and final evaporation rates and their relations to the oxidation curves is very interesting. Oxide films of 700 Å or more at a temperature of 475° C are extremely porous to the evaporation of magnesium. At temperatures of 450° C and lower, all of the films measured were protective to the evaporation process. Films found to be protective to evaporation are also protective to oxidation.

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