Abstract
Measurement of gas evolution from pure copper plate in vacuo gave the following results: (1) A large amount of gas evolved from copper plate polished by emery paper, which was caused by the polishing powder embedded on the surface of the copper plate, so it is desirable to polish such plates electrolytically but not with emery paper. (2) The amount of oxygen in commercial, vacuum-melted and deoxidized copper was determined by low pressure combustion method, and the relation between the oxygen content and the amount of gas evolved from three sorts, of copper plates was examined: the amount of gas evolved from vacuum-melted copper was smaller than that of commercial and deoxidized copper. When these plates were given hydrogen treatment, the amount of gas evolved from vacuum-melted copper and deoxidized copper containing very small amount of oxygen, was as small as that plate of no hydrogen treatment, but that from commercial copper, which contained a large amount of oxygen, was very large. (3) The activation energy of hydrogen diffusion through copper was measured as 32 kcal per g mol. (4) The mechanism of degassing oxygen-rich copper plates which subjected to hydrogen treatment was discussed.
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